Order and timing of generated pictures for generative face video (GFV) supplemental enhancement information (SEI) messages

Abstract

A mechanism for processing video data is disclosed. The mechanism includes determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture. A conversion is performed between a visual media data and a bitstream based on the StoreOutputTensors( ) process.

Description

Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) Order And Timing Of Generated Pictures For Generative Face Video (GFV) Supplemental Enhancement Information (SEI) Messages CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This patent application claims the benefit of U.S. Patent Application No. 63 / 653,386 filed on May 30, 2024 and U.S. Patent Application No.63 / 668,458 filed on July 8, 2024, which are hereby incorporated by reference in their entireties. TECHNICAL FIELD

[0002] The present disclosure relates to generation, storage, and consumption of digital audio video media information in a file format. BACKGROUND

[0003] Digital video accounts for the largest bandwidth used on the Internet and other digital communication networks. As the number of connected user devices capable of receiving and displaying video increases, the bandwidth demand for digital video usage is likely to continue to grow. SUMMARY

[0004] A first aspect relates to a method for processing media data comprising: determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture; and performing a conversion between a visual media data and a bitstream based on the StoreOutputTensors( ) process.

[0005] Optionally, in any of the preceding aspects, another implementation of the aspect provides that each output picture includes an output picture derived for a GFV supplemental enhancement information (SEI) message with a GFV base picture flag (gfv_base_pic_flag) equal to 1.

[0006] Optionally, in any of the preceding aspects, another implementation of the aspect provides that an output order of GFV-output pictures corresponding to GFV SEI messages in a picture unit with a same GFV identification (gfv_id) value and different GFV count (gfv_cnt) values shall be in increasing order of the gfv_cnt values.

[0007] Optionally, in any of the preceding aspects, another implementation of the aspect provides that for any two pictures (picA and picB), wherein the picA precedes the picB in the output order, any GFV-output picture corresponding to a GFV SEI message with a particular GFV identification (gfv_id) value and associated with the picA shall precede, in the output order, any GFV-output picture corresponding to a GFV SEI message with the particular GFV identification (gfv_id) value and associated with the picB.

[0008] Optionally, in any of the preceding aspects, another implementation of the aspect provides that for any two pictures (picA and picB), wherein the picA precedes the picB in decoding order, any GFV-output picture corresponding to a GFV SEI message with a particular GFV identification (gfv_id) value and associated with the picAAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) shall precede, in the output order, any GFV-output picture corresponding to a GFV SEI message with the particular GFV identification (gfv_id) value and associated with the picB.

[0009] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a GFV SEI message is said to be associated with a picture when a picture unit containing the picture contains the GFV SEI message or when the picture is within a persistence scope of the GFV SEI message.

[0010] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a picture order count is a variable that is associated with each picture, uniquely identifies the associated picture among all pictures in a coded video sequence (CVS), and, when the associated picture is to be output, indicates a position of the associated picture in output order relative to output order positions of other pictures in the same CVS that are to be output.

[0011] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a clock tick comprises a variable representing a number of time units of a clock operating at a particular frequency that corresponds to one increment of a clock tick counter.

[0012] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a flag (TimingInfoPresentFlag) is specified to indicate whether timing information is present.

[0013] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the timing information is present, the flag (TimingInfoPresentFlag) is equal to 1, and when the timing information is not present, the flag (TimingInfoPresentFlag) is equal to 0.

[0014] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (TimingInfoPresentFlag) is a derived variable.

[0015] Optionally, in any of the preceding aspects, another implementation of the aspect provides that for a coded layer video sequence (CLVS) of an Advanced Video Coding (AVC) bitstream, the flag (TimingInfoPresentFlag) is set equal to a timing information present syntax element (timing_info_present_flag).

[0016] Optionally, in any of the preceding aspects, another implementation of the aspect provides that for a coded layer video sequence (CLVS) of a High Efficiency Video Coding (HEVC) bitstream, the flag (TimingInfoPresentFlag) is set equal to a video parameter set timing information present flag syntax element or a visual usability information timing information present flag syntax element (vps_timing_info_present_flag | | vui_timing_info_present_flag ).

[0017] Optionally, in any of the preceding aspects, another implementation of the aspect provides that for a coded layer video sequence (CLVS) of a Versatile Video Coding (VVC) bitstream, the flag (TimingInfoPresentFlag) is set equal to a video parameter set timing hypothetical reference decoder (HRD) parameters present flag syntax element or a sequence parameter set timing HRD parameters present flag syntax element ( vps_timing_hrd_params_present_flag | | sps_timing_hrd_params_present_flag ).

[0018] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (TimingInfoPresentFlag) is a syntax element explicitly included in the GFV SEI message when a GFV count (gfv_cnt) is greater than 0.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0019] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a flag (NumTicksPocDiff1PresentFlag) is specified to indicate whether specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for a coded video sequence (CVS).

[0020] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (NumTicksPocDiff1PresentFlag) is a derived variable.

[0021] Optionally, in any of the preceding aspects, another implementation of the aspect provides that in the CVS of an Advanced Video Coding (AVC) bitstream or a Versatile Video Coding (VVC) bitstream, the flag (NumTicksPocDiff1PresentFlag) is always equal to 0, which indicates that the specific timing information of the number of clock ticks corresponding to the difference of the picture order count values equal to 1 is not present for the CVS.

[0022] Optionally, in any of the preceding aspects, another implementation of the aspect provides that in the CVS of a High Efficiency Video Coding (HEVC) bitstream, the flag (NumTicksPocDiff1PresentFlag) is set equal to a video parameter set timing information present flag syntax element or a visual usability information timing information present flag syntax element, and a video parameter set picture order count proportional to timing flag or a visual usability information picture order count proportional to timing flag ( vps_timing_info_present_flag | | vui_timing_info_present_flag ) && ( vps_poc_proportional_to_timing_flag | | vui_poc_proportional_to_timing _flag ).

[0023] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (TimingInfoPresentFlag) is a syntax element explicitly included in the GFV SEI message when a GFV count (gfv_cnt) is greater than 0.

[0024] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when a GFV count (gfv_cnt) is greater than 0, an indication that indicates a picture order count value of the GFV-generated picture corresponding to a current GFV SEI message is included in the current GFV SEI message.

[0025] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication indicates a difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message minus 1.

[0026] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a current GFV identification (currGfvId) and a current GFV count (currGfvCnt) are the gfv_id and the gfv_cnt, respectively, of the current GFV SEI message, and wherein the second GFV SEI message is the GFV SEI message that is in a same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has the gfv_id equal to the currGfvId and the gfv_cnt equal to the currGfvCnt − 1.

[0027] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is a syntax element designated gfv_poc_delta_minus1, and wherein the syntax element is an unsigned exponential-Golomb-coded value of a variable number of bits (ue(v)).Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0028] Optionally, in any of the preceding aspects, another implementation of the aspect provides that prevPocVal is the picture order count value of the picture to be generated corresponding to the second GFV SEI message, and wherein the picture order count value of the picture to be generated corresponding to the current GFV SEI message is equal to the prevPocVal + gfv_poc_delta_minus1 + 1.

[0029] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication indicates a difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message.

[0030] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is only included in the bitstream when a flag indicates that a difference between a current picture order count (currPoc) value of the GFV-generated picture corresponding to the current GFV SEI message and a previous picture order count (prevPoc) value of the GFV-generated picture corresponding to the previous GFV SEI message in a same picture unit is different for different values of a current GFV count (currGfvCnt) greater than 0.

[0031] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag is designated fixed_poc_diff_flag, and wherein the flag has a value is equal to 0.

[0032] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the current GFV SEI message has a gfv_id equal to the currGfvId and the gfv_cnt is equal to the currGfvCnt.

[0033] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the previous GFV SEI message has a gfv_id equal to the currGfvId and the gfv_cnt is equal to currGfvCnt – 1.

[0034] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the flag (fixed_poc_diff_flag) has a value equal to 1, which indicates that the difference between the currPoc and the prevPoc is the same for any value of the currGfvCnt greater than 0, an inidcation of a fixed difference between the currPoc and the prevPoc is not included in the bitstream when the gfv_cnt is greater than 0 but is included in the bitstream when the gfv_cnt is equal to 0.

[0035] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (fixed_poc_diff_flag) is included in each GFV SEI message with the gfv_cnt equal to 0 but applies to all GFV SEI messages with a same gfv_id in a same picture.

[0036] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (fixed_poc_diff_flag) is included in the GFV SEI message with the gfv_cnt equal to 0 in a first picture unit of a coded layer video sequence (CLVS) but applies to all GFV SEI messages with a same gfv_id in the CLVS.

[0037] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (fixed_poc_diff_flag) is not included in the bitstream but is inferred to be equal to 1.

[0038] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag (fixed_poc_diff_flag) is not included in the bitstream but is inferred to be equal to 1, and wherein a fixed difference between the currPoc and the prevPoc is not included in the bitstream and is inferred to be equal to a particular value.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0039] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the particular value is 1.

[0040] Optionally, in any of the preceding aspects, another implementation of the aspect provides that an indication that indicates a number of clock ticks corresponding to a difference of picture order count values equal to 1 is included in the GFV SEI message.

[0041] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is included in the GFV SEI message only when the gfv_cnt is equal to 0.

[0042] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication applies to picture order count values of pictures to be generated corresponding to the current GFV SEI message and subsequent GFV SEI messages in decoding order in a current picture unit with a same gfv_id value as the current GFV SEI message and the gfv_cnt greater than 0.

[0043] Optionally, in any of the preceding aspects, another implementation of the aspect provides that indication is a syntax element coded using an unsigned exponential-Golomb-coded value of a variable number of bits (ue(v)).

[0044] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the syntax element is designated gfv_num_ticks_poc_diff_one_minus1.

[0045] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the syntax element (gfv_num_ticks_poc_diff_one_minus1) is conditionally included in the GFV SEI message based on at least a flag designated gfv_num_ticks_poc_diff_one_present_flag.

[0046] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when there are GFV SEI messages with a same gfv_id as a current GFV SEI message in a current picture unit and the gfv_cnt is greater than 0, the value of the gfv_num_ticks_poc_diff_one_present_flag is required to be equal to 1.

[0047] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when there is no GFV SEI message with a same gfv_id as a current GFV SEI message in a current picture unit and the gfv_cnt is greater than 0, the value of the gfv_num_ticks_poc_diff_one_present_flag is recommended to be equal to 0.

[0048] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when there is no GFV SEI message with a same gfv_id as a current GFV SEI message in a current picture unit and the gfv_cnt is greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag is required to be equal to 0.

[0049] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a flag (gfv_num_ticks_poc_diff_one_present_flag) is conditionally included in the GFV SEI message based at least on whether timing information is present for a coded video sequence (CVS) and whether a specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS.

[0050] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a flag (gfv_num_ticks_poc_diff_one_present_flag) is included in the GFV SEI message only when timing information is present for a coded video sequence (CVS) and specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0051] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the timing information for the CVS is designated TimingInfoPresentFlag and has a value equal to 1.

[0052] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the specific timing information of the number of clock ticks is designated NumTicksPocDiff1PresentFlag and has a value equal to 0.

[0053] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order, a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

[0054] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit contains an intra random access point (IRAP) picture, a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

[0055] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit contains a gradual decoding refresh (GDR) picture, a value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

[0056] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit is associated with a recovery point SEI message, a value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

[0057] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order; and a current picture unit contains an intra random access point (IRAP) picture.

[0058] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is the first picture unit of the current coded layer video sequence (CLVS) in decoding order; a current picture unit contains an intra random access point (IRAP) picture; and a current picture unit contains a gradual decoding refresh (GDR) picture.

[0059] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decodingAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) order; a current picture unit contains an intra random access point (IRAP) picture; and a current picture unit is associated with a recovery point SEI message.

[0060] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order; a current picture unit contains an intra random access point (IRAP) picture; a current picture unit contains a gradual decoding refresh (GDR) picture; and a current picture unit is associated with a recovery point SEI message.

[0061] Optionally, in any of the preceding aspects, another implementation of the aspect provides that an additional condition is added: a coded layer video sequence (CLVS) contains at least one GFV SEI message with the gfv_cnt greater than 0.

[0062] Optionally, in any of the preceding aspects, another implementation of the aspect provides that an additional condition is added: a coded layer video sequence (CLVS) contains at least one GFV SEI message with the gfv_cnt greater than 0 in a current picture unit or after the current picture unit in decoding order.

[0063] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag gfv_num_ticks_poc_diff_one_present_flag is conditionally included in the GFV SEI message based at least on whether timing information is present for a coded video sequence (CVS).

[0064] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the flag gfv_num_ticks_poc_diff_one_present_flag may be signalled only when timing information is present for a coded video sequence (CVS).

[0065] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the syntax element (gfv_num_ticks_poc_diff_one_minus1) is conditionally included in the GFV SEI message based at least on whether timing information is present for a coded video sequence (CVS) and whether specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS.

[0066] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the syntax element (gfv_num_ticks_poc_diff_one_minus1) is included in the GFV SEI message only when timing information is present for a coded video sequence (CVS) and specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS.

[0067] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the syntax element (gfv_num_ticks_poc_diff_one_minus1) is conditionally included in the GFV SEI message based at least on whether timing information is present for the CVS.

[0068] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the syntax element (gfv_num_ticks_poc_diff_one_minus1) is included in the GFV SEI message only when timing information is present for the CVS.

[0069] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is included in the GFV SEI message only when the gfv_cnt is greater than 0.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0070] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is not included in the GFV SEI message and a number of clock ticks corresponding to a difference of picture order count values equal to 1 is inferred to be equal to a particular value.

[0071] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the particular value is 1.

[0072] Optionally, in any of the preceding aspects, another implementation of the aspect provides that when the gfv_cnt is greater than 0, an indication that indicates an output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEI message relative to an output time of the GFV-generated picture corresponding to a second GFV SEI message is included in the GFV SEI message.

[0073] Optionally, in any of the preceding aspects, another implementation of the aspect provides that a current GFV identification (currGfvId) and a current GFV count (currGfvCnt) are the gfv_id and the gfv_cnt, respectively, of the current GFV SEI message, and wherein the second GFV SEI message is the GFV SEI message that is in a same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has the gfv_id equal to the currGfvId and the gfv_cnt equal to the currGfvCnt − 1.

[0074] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is included in the GFV SEI message only when timing information is present for a coded video sequence (CVS).

[0075] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the indication is not included in the GFV SEI message and an output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEI message relative to the output time of the GFV-generated picture corresponding to a second GFV SEI message is inferred to be equal to a particular value.

[0076] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the particular value is 1.

[0077] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the conversion includes encoding the visual media data into the bitstream.

[0078] Optionally, in any of the preceding aspects, another implementation of the aspect provides that the conversion includes decoding the visual media data from the bitstream.

[0079] A second aspect relates to an apparatus for processing video data comprising: a processor; and a non- transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to perform the method of any of the disclosed aspects.

[0080] A third aspect relates to a non-transitory computer readable medium comprising a computer program product for use by a video coding device, the computer program product comprising computer executable instructions stored on the non-transitory computer readable medium such that when executed by a processor cause the video coding device to perform the method of any of the disclosed aspects.

[0081] A fourth aspect relates to a non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture; and performing a conversion between a visual media data and a bitstream based on the StoreOutputTensors( ) process.

[0082] A fifth aspect relates to a method for storing bitstream of a video comprising: determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture; generating a bitstream based on the StoreOutputTensors( ) process; and storing the bitstream in a non-transitory computer-readable recording medium.

[0083] A sixth aspect relates to a method, apparatus, or system described in the present disclosure.

[0084] For the purpose of clarity, any one of the foregoing embodiments may be combined with any one or more of the other foregoing embodiments to create a new embodiment within the scope of the present disclosure.

[0085] These and other features will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] For a more complete understanding of this disclosure, reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference numerals represent like parts.

[0087] FIG.1 illustrates a diagram of a generative face video compression scheme.

[0088] FIG.2 is a block diagram showing an example video processing system.

[0089] FIG.3 is a block diagram of an example video processing apparatus.

[0090] FIG.4 is a flowchart for an example method of video processing.

[0091] FIG.5 is a block diagram that illustrates an example video coding system.

[0092] FIG.6 is a block diagram that illustrates an example encoder.

[0093] FIG.7 is a block diagram that illustrates an example decoder.

[0094] FIG.8 is a schematic diagram of an example encoder. DETAILED DESCRIPTION

[0095] It should be understood at the outset that although an illustrative implementation of one or more embodiments are provided below, the disclosed systems and / or methods may be implemented using any number of techniques, whether currently known or yet to be developed. The disclosure should in no way be limited to the illustrative implementations, drawings, and techniques illustrated below, including the exemplary designs and implementations illustrated and described herein, but may be modified within the scope of the appended claims along with their full scope of equivalents.

[0096] Section headings are used in the present disclosure for ease of understanding and do not limit the applicability of techniques and embodiments disclosed in each section only to that section. Furthermore, H.266Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) terminology is used in some description only for ease of understanding and not for limiting scope of the disclosed techniques. As such, the techniques described herein are applicable to other video codec protocols and designs also. 1. Initial discussion

[0097] This disclosure is related to video coding and signalling. Specifically, this disclosure is related to specifying the output order of among the generated pictures and signalling of order and timing information for generated pictures. The ideas may be applied individually or in various combinations, for video bitstreams coded by any codec, e.g., the versatile video coding (VVC) standard and / or the versatile supplemental enhancement information (SEI) messages for coded video bitstreams (VSEI) standard, and may also be applied in generative video systems other than a generative face video system. 2. Abbreviations

[0098] adaptation parameter set (APS), access unit (AU), coded layer video sequence (CLVS), coded layer video sequence start (CLVSS), cyclic redundancy check (CRC), coded video sequence (CVS), finite impulse response (FIR), intra random access point (IRAP), network abstraction layer (NAL), neural-network post-processing filter (NNPF), neural-network post-filter activation (NNPFA), neural-network post-filter characteristics (NNPFC), picture parameter set (PPS), picture unit (PU), random access skipped leading (RASL) picture, supplemental enhancement information (SEI), step-wise temporal sublayer access (STSA), uniform resource identifier (URI), video coding layer (VCL), versatile supplemental enhancement information as described in Rec. ITU-T H.274 | ISO / IEC 23002-7 (VSEI), video usability information (VUI), versatile video coding as described in Rec. ITU-T H.266 | ISO / IEC 23090-3 (VVC). 3. Further discussion 3.1 Video coding standards

[0099] Video coding standards have evolved primarily through the development of International Telecommunication Union (ITU) telecommunication standardization sector (ITU-T) and International Organization for Standardization (ISO) / International Electrotechnical Commission (IEC) standards. The ITU-T produced H.261 and H.263, ISO / IEC produced motion picture experts group (MPEG)-1 and MPEG-4 Visual, and the two organizations jointly produced the H.262 / MPEG-2 Video and H.264 / MPEG-4 Advanced Video Coding (AVC) and H.265 / high efficiency video coding (HEVC) [1] standards. Since H.262, the video coding standards are based on the hybrid video coding structure wherein temporal prediction plus transform coding are utilized. The Versatile Video Coding (VVC) standard (ITU-T H.266 | ISO / IEC 23090-3) [2] and the associated Versatile Supplemental Enhancement Information for coded video bitstreams (VSEI) standard (ITU-T H.274 | ISO / IEC 23002-7) [3] are designed for use in a maximally broad range of applications, including both the simple uses such as television broadcast, video conferencing, or playback from storage media, and also more advanced use cases such as adaptive bit rate streaming, video region extraction, composition and merging of content from multiple coded video bitstreams, multiview video, scalable layered coding, and viewport-adaptive 360° immersive media. 3.2 SEI messages in general and in VVC and VSEI

[0100] SEI messages assist in processes related to decoding, display or other purposes. However, SEI messages are not required for constructing the luma or chroma samples by the decoding process. Conforming decoders are notAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) required to process this information for output order conformance. Some SEI messages are required for checking bitstream conformance and for output timing decoder conformance. Other SEI messages are not required for check bitstream conformance.

[0101] Annex D of VVC specifies syntax and semantics for SEI message payloads for some SEI messages, and specifies the use of the SEI messages and VUI parameters for which the syntax and semantics are specified in ITU-T H.274 | ISO / IEC 23002-7. 3.3 Generative face video SEI message

[0102] FIG. 1 illustrates a diagram of a generative face video compression scheme. In the scheme, some base pictures, called key pictures, are coded using a video codec, e.g. VVC, and subsequent pictures include meta data of face features, e.g. head position, eye matrix representing the open-close status and level of eyes. A decoder uses a generative neural network to form a decoded video based on those key pictures and subsequent face feature data. JVET- AG2032 [4] includes the specification of the generative face video SEI message, as follows. 8.37.1 Generative face video SEI message syntax generative_face_video ( payloadSize ) { Descriptor fv id ue(v)Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) gfv_kps_pred_flag u(1) gfv_coordinate_z_present_flag u(1)Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) gfv_num_matrix_types_minus1 ue(v) if( !gfv_base_pic_flag )Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) if( gfv_matrix_delta_element_int[ i][ j ][ k ][ m ] | | gfv_matrix_delta_element_dec[ i ][ j ][ k ][ m ]

[0103] The generative face video (GFV) SEI message indicates facial parameters and specifies a facial parameter translator network, denoted as TranslatorNN( ), that may be used to convert various formats of facial parameters signaled in the SEI message into a fixed format of parameters, and a face picture generator neural network, denoted as GenerativeNN( ), that may be used to generate output pictures using the fixed format of facial parameters and previously decoded output pictures.

[0104] NOTE 1 – Facial parameters could be determined from source pictures prior to encoding. Such source pictures may be referred to as driving pictures.

[0105] NOTE 2 – Previously decoded output pictures input to GenerativeNN( ) may be a base picture (a decoded output picture that provides the reference texture from which the face pictures may be generated) and, optionally, a picture that can be fused by GenerativeNN( ) to improve background texture and facial details. When the current picture is not a base picture, the GFV SEI message may be used to generate a face picture based on the previously decoded base picture, the facial parameters conveyed by the GFV SEI message, and, optionally, the current decoded picture for fusion pupose.

[0106] Use of this SEI message requires the definition of the following variables: - Input picture width and height in units of luma samples, denoted herein by CroppedWidth and CroppedHeight, respectively. - Luma sample array baseCroppedYPic and chroma sample arrays baseCroppedCbPic and baseCroppedCrPic for a decoded output picture, denoted as BasePicture, corresponding to a source base picture.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) - Luma sample array driveCroppedYPic and chroma sample arrays driveCroppedCbPic and driveCroppedCrPic for a decoded output picture, denoted as DrivePicture, corresponding to a source driving picture. - Bit depth BitDepthY for the luma sample array of the input pictures. - Bit depth BitDepthC for the chroma sample arrays, if any, of the input pictures. - A chroma format indicator, denoted herein by ChromaFormatIdc, as described in subclause 7.3.

[0107] The variables SubWidthC and SubHeightC are derived from ChromaFormatIdc as specified by Table 2.

[0108] gfv_id contains an identifying number that may be used to identify face feature information and specify a neural network that may be used as TranslatorNN( ). The value of gfv_id shall be in the range of 0 to 232–− 2, inclusive. Values of gfv_id from 256 to 511, inclusive, and from 231to 232–− 2, inclusive, are reserved for future use by ITU- T | ISO / IEC. Decoders conforming to this edition of this document encountering a GFV SEI message with gfv_id inthe range of 256 to 511, inclusive, or in the range of 231 to 232–− 2, inclusive, shall ignore the SEI message.

[0109] NOTE 3 – Different values of gfv_id in different GFV SEI messages could be used to identify different faces when more than one face is present in an output picture, for example.

[0110] gfv_cnt specifies a GFV SEI message instance count value for this gfv_id value within a picture unit.

[0111] The gfv_cnt of the first GFV SEI message, in decoding order, with a particular value of gfv_id within picture unit shall be equal to 0. When gfv_cnt assigned to currGfvCnt is greater than 0, a GFV SEI message with the same gfv_id value and gfv_cnt equal to currGfvCnt − 1 shall precede the current GFV SEI message in decoding order in the same picture unit.

[0112] The value of gfv_cnt shall be in the range of 0 to 65,535, inclusive.

[0113] gfv_base_pic_flag equal to 1 indicates the current decoded output picture corresponds to a base picture. gfv_base_pic_flag equal to 0 indicates the current decoded output picture does not correspond to a base picture or this SEI message does not specify syntax elements for a base picture. When gfv_cnt is greater than 0, gfv_base_pic_flag shall be equal to 0.

[0114] The following constraints apply to the value of gfv_base_pic_flag: - When a GFV SEI message is the first GFV SEI message, in decoding order, that has a particular gfv_id value within the current CLVS, the value of gfv_base_pic_flag shall be equal to 1. - When a GFV SEI message that has a particular gfv_id value has gfv_base_pic_flag being equal to 0, this SEI message pertains to the current decoded picture and all subsequent decoded pictures of the current layer, in output order, until the end of the current CLVS or up to but excluding the decoded picture that follows the current decoded picture in output order within the current CLVS and is associated with a subsequent GFV SEI message, in decoding order, having gfv_base_pic_flag equal to 0 and that particular gfv_id value within the current CLVS, whichever is earlier.

[0115] gfv_nn_present_flag equal to 1 indicates a neural network that may be used as a TranslatorNN( ) is contained or indicated by the SEI message. gfv_nn_present_flag equal to 0 indicates a neural network that may be used as a TranslatorNN( ) is not contained or indicated by the SEI message. When gfv_nn_present_flag is not present, it is inferred to be 0.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0116] When a GFV SEI message with a particular value of gfv_id is present in an IRAP picture unit or in a picture unit that follows an IRAP picture unit in output order and is not preceded in output order by any picture unit that follows the IRAP picture in output order and has a GFV SEI message with that particular value of gfv_id, gfv_nn_present_flag shall be present and equal to 1.

[0117] When gfv_nn_present_flag is equal to 0 and TranslatorNN is referenced in the semantics of this SEI message, the applicable TranslatorNN is defined by the GFV SEI message that is present in the last preceding picture unit in output order that has that has the same value of gfv_id as that in the current GFV SEI message and gfv_nn_present_flag equal to 1.

[0118] gfv_nn_base_flag, gfv_nn_mode_idc, gfv_nn_reserved_zero_bit_a, gfv_nn_tag_uri, gfv_nn_uri, gfv_nn_payload_byte[ i ] specify a neural network that may be used as a TranslatorNN( ). gfv_nn_base_flag, gfv_nn_mode_idc, gfv_nn_reserved_zero_bit_a, gfv_nn_tag_uri, gfv_nn_uri, gfv_nn_payload_byte[ i ] have the same syntax and semantics as nnpfc_base_flag, nnpfc_mode_idc, nnpfc_reserved_zero_bit_a, nnpfc_tag_uri, nnpfc_uri, nnpfc_payload_byte[ i ], respectively.

[0119] When either of the following conditions is true, GFV SEI messages shall have the same SEI payload content: - The GFV SEI messages are present in the same picture unit, have gfv_cnt equal to 0, have gfv_nn_base_flag present, and have the same value of gfv_id and gfv_nn_base_flag, - The GFV SEI messages are present in the same picture unit, have the same value of gfv_cnt that is greater than 0, and have the same value of gfv_id.

[0120] gfv_drive_pic_fusion_flag, when present, equal to 1 indicates the current decoded picture, which corresponds to a driving picture that may be used for fusion, may be input to GenerativeNN( ). gfv_drive_pic_fusion_flag equal to 0 indicates the current decoded picture should not be input to GenerativeNN( ).

[0121] NOTE 3 – A gfv_drive_pic_fusion_flag value of 1 can be used, for example, to indicate that the current decoded picture can be used to improve face details or handle background changes.

[0122] NOTE 4 – Fusion takes the three inputs: the base picture, features from keypoints and / or matrices carried in the GFV SEI message, and the current decoded picture, and outputs a picture.

[0123] NOTE 5 – When current decoded picture corresponds to a driving picture, it should be marked as not for output purpose.

[0124] gfv_coordinate_present_flag equal to 1 indicates that coordinate information of keypoints is present. gfv_coordinate_present_flag equal to 0 indicates that coordinate information of keypoints is not present.

[0125] It is a requirement of bitstream conformance that when gfv_matrix_type_idx[ i ] for any i from 0 to gfv_num_matrix_types_minus1 is equal to 0 or 1, the value of gfv_coordinate_present_flag shall be equal to 1.

[0126] gfv_coordinate_precision_factor_minus1 plus 1 indicates the length, in bits, of syntax elements gfv_coordinate_x_abs[i], gfv_coordinate_y_abs[i], gfv_coordinate_z_abs[i], gfv_coordinate_dx_abs[ i ], gfv_coordinate_dy_abs[ i ] and gfv_coordinate_dz_abs[ i ].Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0127] gfv_num_kps_minus1 plus 1 indicates the number of keypoints. The value of gfv_num_kps_minus1 shall be in the range of 0 to 210– 1, inclusive.

[0128] gfv_kps_pred_flag equal to 1 indicates syntax elements gfv_coordinate_dx_abs[ i ] ,gfv_coordinate_dy_abs[ i ], and gfv_coordinate_dz_abs[ i ] are present and syntax elements gfv_coordinate_dx_sign_flag[ i ], gfv_coordinate_dy_sign_flag[ i ] and gfv_coordinate_dz_sign_flag[ i ] may be present. gfv_kp_pred_flag equal to 0 indicates gfv_coordinate_x_abs[ i ] ,gfv_coordinate_y_abs[ i ], and gfv_coordinate_z_abs[ i ] are present and syntax elements gfv_coordinate_x_sign_flag[ i ], gfv_coordinate_y_sign_flag[ i ] and gfv_coordinate_z_sign_flag[ i ] may be present.

[0129] gfv_coordinate_z_present_flag equal to 1 indicates that z-axis coordinate information of the keypoints is present. coordinate_z_present_flag equal to 0 indicates that the z-axis coordinate information of the keypoints is not present.

[0130] gfv_coordinate_z_max_value_minus1 plus 1 indicates the maximum absolute value of z-axis coordinates of keypoints.

[0131] gfv_coordinate_x_abs[ i ] indicates the normalized absolute value of the x-axis coordinate of the i-th keypoint.

[0132] gfv_coordinate_x_sign_flag[ i ] specifies the sign of the x-axis coordinate of the i-th keypoint. When gfv_coordinate_x_sign_flag[ i ] is not present, it is inferred to be equal to 0.

[0133] gfv_coordinate_y_abs[ i ] specifies the normalized absolute value of y-axis coordinate of i-th keypoint.

[0134] gfv_coordinate_y_sign_flag[ i ] specifies the sign of the y-axis coordinate of the i-th keypoint. When gfv_coordinate_y_sign_flag[i] is not present, it is inferred to be equal to 0.

[0135] gfv_coordinate_z_abs[ i ] specifies the normalized absolute value of z-axis coordinate of the i-th keypoint.

[0136] gfv_coordinate_z_sign_flag[ i ] specifies the sign of the z-axis coordinate of the i-th key point. When gfv_coordinate_z_sign_flag[ i ] is not present, it is inferred to be equal to 0.

[0137] gfv_coordinate_dx_abs[ i ] indicates the absolute difference value of the normalized value of the x-axis coordinate of the i-th keypoint.

[0138] gfv_coordinate_dx_sign_flag[ i ] specifies the sign of the difference value of the x-axis coordinate of the i-th keypoint. When gfv_coordinate_dx_sign_flag[ i ] is not present, it is inferred to be equal to 0.

[0139] gfv_coordinate_dy_abs[ i ] specifies the absolute difference value of the normalized y-axis coordinate of the i-th keypoint.

[0140] gfv_coordinate_dy_sign_flag[ i ] specifies the sign of the difference value of the y-axis coordinate of the i-th keypoint. When gfv_coordinate_yd_sign_flag[i] is not present, it is inferred to be equal to 0.

[0141] gfv_coordinate_dz_abs[ i ] specifies the absolute difference value of the normalized z-axis coordinate of the i-th keypoint.

[0142] gfv_coordinate_dz_sign_flag[ i ] specifies the sign of the difference value of the z-axis coordinate of the i-th key point. When gfv_coordinate_dz_sign_flag[ i ] is not present, it is inferred to be equal to 0.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0143] The variables coordinateDeltaX[ i ], coordinateDeltaY[ i ] and coordinateDeltaZ[ i ] indicating the delta x-axis coordinate, delta y-axis coordinate and delta z-axis coordinate of the i-th keypoint, respectively, are derived as follows: ^^^^ ∗ ^^^_^^^^^^^^^^_^^_^^^^_^^^^^ ^ ^^ ∗ ^^^_^^^^^^^^^^_^^_^^^^ ^ ^ ∗ ^^^^^^^^^^^^ coordinateDeltaX[ i ] = ^^^ ^^^^_^^^^^^^^^^_^^^^^^^^^_^^^^^^_ ^^!^^ "^^ ^^^^ ∗ ^^^_^^^^^^^^^^_^#_^^^^_^^^^^ ^ ^^ ∗ ^^^_^^^^^^^^^^_^#_^^^^ ^ ^ ∗ ^^^^^^^$^^^^^ coordinateDeltaY[i] = ^^^ ^^^^_^^^^^^^^^^_^^^^^^^^^_^^^^^^_ ^^!^^ "^^ ^^^^ ∗ ^^^^^^^^^^_^%_^^^^_^^^^^ ^ ^^ ∗ ^^^_^^^^^^^^^^_^%_^^^^ ^ ^ ∗^^^^_^^^^^^^^^^_%_ ^^_^^^!^_ ^^!^^"^^ coordinateDeltaZ[i] = ^^^ ^^^^_^^^^^^^^^^_^^^^^^^^^_^^^^^^_ ^^!^^ "^^

[0144] The variables coordinateX[ i ], coordinateY[ i ] and coordinateZ[ i ] indicating the x-axis coordinate, y- axis coordinate and z-axis coordinate of the i-th keypoint, respectively, are derived as follows:

[0145] When gfv_kps_pred_flag is equal to 0, ^^^^ ∗ ^^^_^^^^^^^^^^_^_^^^^_^^^^^ ^ ^^ ∗ ^^^_^^^^^^^^^^_^_^^^^ ^ ^ ∗ ^^^^^^^^^^^^ coordinateX[ i ] = ^^^ ^^^^_^^^^^^^^^^_^^^^^^^^^_^^^^^^_ ^^!^^ "^^coordinateX[ i ] = (( i > 0 ) ? coordinateX[ i - 1 ] : 0 ) + coordinateDeltaX[ i ] coordinateY[ i ] = (( i > 0 ) ? coordinateY[ i - 1 ] : 0 ) + coordinateDeltaY[ i ] coordinateZ[ i ] = (( i > 0 ) ? coordinateZ[ i - 1 ] : 0 ) + coordinateDeltaZ[ i ] } else { coordinateX[ i ] = BaseKpCoordinateX[ i ] + coordinateDeltaX[ i ] coordinateY[ i ] = BaseKpCoordinateY[ i ] + coordinateDeltaY[ i ] coordinateZ[ i ] = BaseKpCoordinateZ[ i ] + coordinateDeltaZ[ i ] } where BaseKpCoordinateX[ i ], BaseKpCoordinateY[ i ], BaseKpCoordinateZ[ i ] indicating the x-axis, y-axis and z-axis coordinates, respectively, of the i-th keypoint for the base picture are derived as follows: if( gfv_base_pic_flag ) { BaseKpCoordinateX[ i ] = coordinateX[ i ] BaseKpCoordinateY[ i ] = coordinateY[ i ] BaseKpCoordinateZ[ i ] = coordinateZ[ i ] }

[0147] gfv_matrix_present_flag equal to 1 indicates that matrix parameters are present. gfv_matrix_present_flag equal to 0 indicates that matrix parameters are not present.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0148] gfv_matrix_element_precision_factor_minus1 plus 1 indicates the length, in bits, of syntax elements gfv_matrix_element_dec[ i ][ j ][ k ][ m ] and gfv_matrix_delta_element_dec[ i ][ j ][ k ][ m ].

[0149] gfv_num_matrix_types_minus1 plus 1 indicates the number of matrix types signalled in the SEI message. The value of gfv_matrix_type_num_minus1 shall be in the range of 0 to 26 – 1, inclusive.

[0150] gfv_matrix_pred_flag equal to 1 indicates syntax elements gfv_matrix_element_int [ i ][ j ][ k ][ m ] , gfv_matrix_element_dec [ i ][ j ][ k ][ m ] are present and gfv_matrix_element_sign_flag [ i ][ j ][ k ][ m ] may be present. gfv_matrix_pred_flag equal to 0 indicates gfv_matrix_delta_element_int [ i ][ j ][ k ][ m ] , gfv_matrix_delta_element_dec [ i ][ j ][ k ][ m ] are present and syntax element gfv_matrix_delta_element_sign_flag [ i ][ j ][ k ][ m ] may be present. When gfv_matrix_pred_flag is not present, it is inferred to be 0.

[0151] gfv_matrix_type_idx[ i ] indicates the index of the i-th matrix type as specified in Table 3. Table 3 - Specification of gfv_matrix_type_idx Value Specification 2D 2D pace and eing

[0152] NOTE 6. The undefined matrxi type is used to represent the matrxi type rather than affine translation matrix, covariance matrix, rotation matrix, translation matrix and compact feature matrix. It is may be used by the user to extend the matrix type.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0153] gfv_num_matrices_equal_to_num_kps_flag[ i ] equal to 1 indicates that the number of matrices of the i- th matrix type is equal to gfv_num_kps_minus1 + 1. gfv_num_matrices_equal_to_num_kps_flag[ i ] equal to 0 indicates the number of matrices of the i-th matrix type is not equal to gfv_num_coordinates_minus1 + 1.

[0154] gfv_num_matrices_info[ i ] provides information to derive the number of the matrices of the i-th matrix type.

[0155] gfv_matrix_width_minus1[ i ] plus 1 indicates the width of the matrix of the i-th matrix type.

[0156] gfv_matrix_height_minus1[ i ] plus 1 indicates the height of the matrix of the i-th matrix type.

[0157] gfv_matrix_for_3D_space_flag[ i ] equal to 1 indicates the matrix of the i-th matrix type is a matrix defined in three-dimensional space. gfv_matrix_for_3D_space_flag[ i ] equal to 0 indicates the matrix of the i-th matrix type is a matrix defined in two-dimensional space.

[0158] When gfv_matrix_width_minus1[ i ] is not present, it is inferred as follows: - If gfv_matrix_type_idx[ i ] is equal to 0, 1 or 4, and one of coordinate_z_present_flag and gfv_matrix_for_3D_space_flag[ i ] is present and equal to 1, gfv_matrix_width_minus1[i] is inferred to be equal to 2 - otherwise, if matrix_type_idx[ i ] is equal to 0, 1 or 4, and one of coordinate_z_present_flag and gfv_matrix_for_3D_space_flag[ i ] is present and equal to 0, gfv_matrix_width_minus1[ i ] is inferred to be equal to 1 - otherwise (matrix_type_idx[ i ] is equal to 5 or 6), gfv_matrix_width_minus1[ i ] is inferred to be equal to 0

[0159] When gfv_matrix_height_minus1[ i ] is not present, it is inferred as follows: - If matrix_type_idx is equal to 0, 1, 4, 5 or 6, and one of gfv_coordinate_z_present_flag and gfv_matrix_for_3D_space_flag[ i ] is present and equal to 1, gfv_matrix_height_minus1[ i ] is inferred to be equal to 2. - otherwise (gfv_matrix_type_idx is equal to 0, 1, 4, 5 or 6, and one of gfv_coordinate_z_present_flag and gfv_matrix_for_3D_space_flag[ i ] is 0), gfv_matrix_height _minus1[ i ] is inferred to be equal to 1.

[0160] The variables matrixWidth[ i ] and matrixHeight[ i ] indicating the width and height of the matrix of the i- th matrix type are derived as follows matrixWidth[ i ] = gfv_matrix_width_minus1[ i ] + 1 matrixHeight[ i ] = gfv_matrix_height_minus1[ i ] + 1

[0161] gfv_num_matrices_minus1[ i ] plus 1 indicates the number of matrices of the i-th matrix type.

[0162] The variable numMatrices[ i ] indicating the number of the matrices of the i-th matrix type is derived as follows: if( gfv_matrix_type_idx[ i ] == 0 || gfv_matrix_type_idx[ i ] == 1 ) {i ] ? gfv_num_kps_minus1 + 1 : ( gfv_num_matrices_info[ i ] < gfv_num_kp_minus1 ? gfv_num_matrices_info [ i ] + 1 : gfv_num_matrices_info [ i ] + 2 )Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) else numMatrices[ i ] = gfv_num_matrices_info[ i ] + 1 } else if( gfv_matrix_type_idx[ i ] >= 2 && gfv_matrix_type_idx[ i ] < 7) numMatrices[ i ] = 1 else numMatrices[ i ] = gfv_num_matrices_minus1[ i ] + 1

[0163] gfv_matrix_element_int[ i ][ j ][ k ][ m ] indicates the integer part of the value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type.

[0164] gfv_matrix_element_dec[ i ][ j ][ k ][ m ] indicates the decimal part of the value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type.

[0165] gfv_matrix_element_sign_flag[ i ][ j ][ k ][ m ] indicates the sign of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type. When gfv_matrix_element_sign_flag[ i ][ j ][ k ][ m ]is not present, it is inferred to be equal to 0.

[0166] gfv_matrix_delta_element_int[ i ][ j ][ k ][ m ] indicates the integer part of the difference value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type.

[0167] gfv_matrix_delta_element_dec[ i ][ j ][ k ][ m ] indicates the decimal part of the difference value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type.

[0168] gfv_matrix_delta_element_sign_flag[ i ][ j ][ k ][ m ] indicates the sign of the difference value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type. When gfv_matrix_element_sign_flag[ i ][ j ][ k ][ m ]is not present, it is inferred to be equal to 0.

[0169] The variable matrixElementDeltaVal[ i ][ j][ k ][ m ] representing the difference value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type is derived as follows: matrixElementDeltaVal[ i][ j ][ k ][ m ] = ^1 − 2 ∗ gfv_matrix_delta_element_sign_flag^ i ^^ j ^^ k ^^ m ^^ ∗^^^_ ^^^^^_^^^^^_^^^ ^^^_^^^^ ^ ^^ : ^^ ; ^^ ^ ^gfv_matrix_delta_element_int^ i ^^ j ^^ k ^^ m ^ +^^^ ^^^^_ ^^^^^_^^^ ^^^_^^^^^^^^^_^^^^^^_ ^^!^^ "^^ ^

[0170] The variable matrixElementVal[ i ][ j][ k ][ m ] representing the value of the matrix element at position (m, k) of the j-th matrix of the i-th matrix type is derived as follows: when gfv_matrix_pred_flag is equal to 0 matrixElementVal[ i][ j ][ k ][ m ] = ^1 − 2 ∗ gfv_matrix_element_sign_flag^ i ^^ j ^^ k ^^ m ^^ ∗^^^_ ^^^^^_^^^ ^ rix_element_int^ i ^^ j ^^ k ^^ ^^_^^^^ ^ ^^ : ^^ ; ^^ ^ ^gfv_mat m ^ + ^^^ ^^!^^ "^^ ^ if(when gfv_matrix_pred_flag is equal to 1 matrixElementVal[ i][ j ][ k ][ m ] = BaseMatrixElementVal[ i][ j ][ k ][ m ] + matrixElementDeltaVal[ i][ j ][ k ][ m ] +Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0171] For a particular gfv_id value, the following process is used in increasing order of gfv_cnt to generate a video picture per each GFV SEI message that has gfv_base_pic_flag equal to 0 and a unique value of gfv_cnt within a picture unit: DeriveSigParam( ) TranslatorNN (sigKeyPoint , sigMatrix) DeriveInputTensors( ) if( gfv_base_pic_flag == 0 && gfv_drive_pic_fusion_flag == 0) { if(ChromaFormatIdc == 0 ) GenerativeNN( inputBaseY, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix) else GenerativeNN( inputBaseY, inputBaseCb, inputBaseCr, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix) } else if(gfv_base_pic_flag == 0 && gfv_drive_pic_fusion_flag == 1) { if(ChromaFormatIdc == 0 ) GenerativeNN( inputBaseY, inputDriveY, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix) else GenerativeNN( inputBaseY, inputBaseCb, inputBaseCr, inputDriveY, inputDriveCb, inputDriveCr , inputBaseKeyPoint, inputBaseMatrix,, inputDriveKeyPoint, inputDriveMatrix) } StoreOutputTensors( )

[0172] The process DeriveSigParam () for deriving the inputs of TranslatorNN () is specified as follows:

[0173] The keypoint coordinate array sigKeyPoint and the matrix sigMatrix are derived as follows: if( gfv_coordinate_present_flag ) { for ( i = 0; i< = gfv_num_kps_minus1; i++ ) { sigKeyPoint[ i ]

[0000] = coordinateX[ i ] sigKeyPoint[ i ]

[0001] = coordinateY[ i ] if ( gfv_coordinate_z_present_flag ) sigKeyPoint[ i ]

[0002] = coordinateZ[ i ] } } else { for ( i = 0; i < =num_kps_minus1; i++ ) { sigKeyPoint [ i ]

[0000] = 0 sigKeyPoint [ i ]

[0001] = 0Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) if ( gfv_coordinate_z_present_flag ) sigKeyPoint [ i ]

[0002] = 0 } } if( gfv_matrix_present_flag ) { for ( i = 0; i <= gfv_num_matrix_types_minus1; i++ ) { for ( j = 0; j < numMatrices[ i ]; j++ ) { for( k = 0; k < matrixHeight [ i ]; k++ ) { for ( l = 0;l < matrixWidth [ i ]; l++) { sigMatrix[ i ][ j ][ k ][ l ] = matrixElementVal[ i ][ j][ k][ l ] } } } } } else { for ( i = 0; i <= gfv_num_matrix_types_minus1; i++ ) { for ( j = 0; j < numMatrices[ i ]; j++ ) { for( k = 0; k < matrixHeight [ i ]; k++ ) { for ( l = 0;l < matrixWidth [ i ]; l++) { sigMatrix [ i ][ j ][ k ][ l ] = 0 } } } } }

[0174] TranslatorNN( ) is a process to translate the various formats of the facial parameters carried in the SEI message to the fixed format of the facial parameters to be input to the generative network to generate the output picture

[0175] Inputs to TranslatorNN() are: - sigKeyPoint and sigMatrix

[0176] Outputs of TranslatorNN() are: - convKeyPoint and convNumKeyPoint - convMatrix and convNumMatrix, convMatrixWidth, convMatrixHeight

[0177] The process DeriveInputTensors( ) for deriving the inputs of GenerativeNN ( ) is specified as follows:

[0178] When gfv_base_pic_flag is equal to 1, the BasePicture input tensor inputBaseY, inputBaseCb and inputBaseCr are derived as follows:Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) for( x = 0; x < CroppedWidth; x++ ) { for ( y = 0; y < CroppedHeight; y++ ) { inputBaseY[ x ][ y ] = InpY( baseCroppedYPic[ x ][ y ] ) } } if (ChromaFormatIdc !=0) { for( x = 0; x < CroppedWidth / SubWidthC; x++ ) { for ( y = 0; y < CroppedHeight / SubHeightC; y++ ) { inputBaseCb[ x][ y ] = InpC( baseCroppedCbPic[ x][ y ] ) inputBaseCr[ x][ y ] = InpC( baseCroppedCrPic[ x ][ y ] ) } } }

[0179] When gfv_drive_pic_fusion_flag is equal to 1, the DrivePicture luma sample array inputDriveY, inputDriveCb and input DriveCr are derived as follows: for( x = 0; x< CroppedWidth; x++ ) { for ( y = 0; y< CroppedHeight; y++ ) { inputDriveY[ x ][ y ] = InpY( driveCroppedYPic[ x ][ y ] ) } } if (ChromaFormatIdc !=0) { for( x = 0; x< CroppedWidth / SubWidthC; x++ ) { for ( y = 0; y < CroppedHeight / SubHeightC; y++ ) { InputDriveCb[ x][ y ] = InpC( driveCroppedCbPic[ x][ y ] ) InputDriveCr[ x][ y ] = InpC( driveCroppedCrPic[ x ][ y ] ) } } }

[0180] When gfv_base_pic_flag is equal to 0, the keypoint coordinate array inputDriveKeyPoint and the matrix inputDriveMatrix for the current picture are derived as follows: for ( i = 0; i < = convNumKeyPoint; i++ ) { inputDriveKeyPoint[ i ]

[0000] = convKeyPoint[ i ]

[0000] inputDriveKeyPoint [ i ]

[0001] = convKeyPoint[ i ]

[0001] inputDriveKeyPoint [ i ]

[0002] = convKeyPoint[ i ]

[0002] }Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) for( j = 0; j < convNumMatrix; j++ ) { for( k=0; k< convMatrixHeight; k++ ) { for ( m=0;m< convMatrixWidth; m++) { inputDriveMatrix[ j ][ k ][ m ] = convMatrix [ j ][ k ][ m ] } } }

[0181] When gfv_base_pic_flag is equal to 1, the keypoint coordinate array inputBaseKeyPoint and the matrix inputBaseMatrix for the base picture are derived as follows: for ( i = 0; i < = convNumKeyPoint; i++ ) { inputBaseKeyPoint[ i ]

[0000] = convKeyPoint[ i ]

[0000] inputBaseKeyPoint [ i ]

[0001] = convKeyPoint[ i ]

[0001] inputBaseKeyPoint [ i ]

[0002] = convKeyPoint[ i ]

[0002] } for( j = 0; j < convNumMatrix; j++) { for( k=0; k< convMatrixHeight; k++ ) { for ( l=0;l< convMatrixWidth; l++) { inputBaseMatrix[ j ][ k ][ l ] = convMatrix [ j ][ k ][ l ] } } } where the functions InpY( ) and InpC( ) are specified as follows: InpY( x ) = x ÷ ( ( 1 << BitDepthY ) – 1 ) InpC( x ) = x ÷ ( ( 1 << BitDepthC ) – 1 )

[0182] GenerativeNN ( ) is a process to generate the sample values of an output picture corresponding to a driving picture. It is only invoked when gfc_base_pic_flag is equal to 0. Input values to GenerativeNN( ) and output values from GenerativeNN( ) are real numbers.

[0183] Inputs to GenerativeNN() are: - When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 0 and ChromaFormatIdc is equal to 0: inputBaseY, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix - When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 0 and ChromaFormatIdc is not equal to 0: inputBaseY, inputBaseCb, inputBaseCr, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix - When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 1 and ChromaFormatIdc is equal to 0: inputBaseY, inputDriveY, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrixAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) - When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 1 and ChromaFormatIdc is not equal to 0: inputBaseY, inputBaseCb, inputBaseCr, inputDriveY, inputDriveCb, inputDriveCr , inputBaseKeyPoint, inputBaseMatrix,, inputDriveKeyPoint, inputDriveMatrix

[0184] Outputs of GenerativeNN( ) are: - A luma sample array genY - When ChromaFormatIdc is not equal to 0, two chroma sample arrays genCb and genCr.

[0185] The process StoreOutputTensors( ) for deriving the output is specified as follows:

[0186] when gfv_base_pic_flag is equal to 0, the output sample array outYPic[ x ][ y ], outCbPic[ x ][ y ], and outCrPic[ x ][ y ] are derived as follows: for(x=0; x< CroppedWidth; x++){ for(y=0; y< CroppedHeight; y++){ outputYPic[ x ][ y ] = OutY( genY[ x ][ y ] ) } } if(ChromaFormatIdc != 0) { for(x=0; x< CroppedWidth / SubWidthC; x++){ for(y=0; y< CroppedHeight / SubHeightC; y++){ outputCbPic[ x ][ y ] = OutC( genCb[ x ][ y ] ) outputCrPic[ x][ y ] = OutC( genCr[ x ][ y ] ) } } }

[0187] when gfv_base_pic_flag is equal to 1, the output sample array outYPic[ x ][ y ], outCbPic[ x ][ y ], and outCrPic[ x ][ y ] are derived as follows: for(x=0; x< CroppedWidth; x++){ for(y=0; y< CroppedHeight; y++){ outputYPic[ x ][ y ] = baseCroppedYPic [ x ][ y ] } } if(ChromaFormatIdc != 0) { for(x=0; x< CroppedWidth / SubWidthC; x++){ for(y=0; y< CroppedHeight / SubHeightC; y++){ outputCbPic[ x ][ y ] = baseCroppedCbPic [ x ][ y ] outputCrPic[ x][ y ] = baseCroppedCbPic [ x ][ y ] }Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) } }

[0188] where the functions OutY( ) and OutC( ) are specified as follows: OutY( x ) = Clip3( 0, ( 1 << BitDepthY ) – 1 , x * ( ( 1 << BitDepthY ) – 1 ) OutC( x ) = Clip3( 0, ( 1 << BitDepthC ) – 1 , x * ( ( 1 << BitDepthC ) – 1 ) 4. Technical problems solved by disclosed technical solutions

[0189] An example design of the GFV SEI message has the following problems:

[0190] First, when a picture unit contains multiple GFV SEI messages with the same gfv_id value and different gfv_cnt values, the process StoreOutputTensors( ) derives an output picture for (or corresponding to) each of the GFV SEI messages. However, the output order of these output pictures (for simplicity, each output picture derived by the process StoreOutputTensors( ) is referred to as a GFV-generated picture) is not specified.

[0191] Second, it is allowed that a GFV-generated picture corresponding to a GFV SEI message in one picture unit may be between, in output order, GFV-generated pictures corresponding to GFV SEI messages in another picture unit.

[0192] Third, when a picture unit contains multiple GFV SEI messages with the same gfv_id value and different gfv_cnt values, and the process StoreOutputTensors( ) derives an output picture for (or corresponding to) each of the GFV SEI messages, the timing information, e.g., the output time, of the GFV-generated pictures corresponding to the GFV SEI messages with gfv_cnt greater than 0 is missing. 5. A listing of solutions and embodiments

[0193] To solve the above-described problems, methods as summarized below are disclosed. The aspects should be considered as examples to explain the general concepts and should not be interpreted in a narrow way. Furthermore, these examples can be applied individually or combined in any manner. 1) In one example, it is specified that, each output picture derived by the process StoreOutputTensors( ), including the output picture derived for a GFV SEI message with gfv_base_pic_flag equal to 1, is referred to as a GFV-generated picture. 2) In one example, it is specified that, a GFV SEI message is said to be associated with a picture when the picture unit containing the picture contains the GFV SEI message or the picture is within the persistence scope of the GFV SEI message. 3) In one example, it is specified that, picture order count is a variable that is associated with each picture, uniquely identifies the associated picture among all pictures in the CVS, and, when the associated picture is to be output, indicates the position of the associated picture in output order relative to the output order positions of the other pictures in the same CVS that are to be output. 4) In one example, it is specified that, a clock tick is variable representing the number of time units of a clock operating at a particular frequency that corresponds to one increment of a clock tick counter.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 5) In one example, the flag TimingInfoPresentFlag is specified that indicates whether timing information is present. If timing information is present, TimingInfoPresentFlag is equal to 1. Otherwise, TimingInfoPresentFlag is equal to 0. a. In one example, the flag is derived. i. For a CLVS of an AVC bitstream, TimingInfoPresentFlag is set equal to timing_info_present_flag. ii. For a CLVS of an HEVC bitstream, TimingInfoPresentFlag is set equal to ( vps_timing_info_present_flag | | vui_timing_info_present_flag ). iii. In a CLVS of an VVC bitstream, TimingInfoPresentFlag is set equal to ( vps_timing_hrd_params_present_flag | | sps_timing_hrd_params_present_flag ). b. In one example, the flag is explicitly signalled in the GFV SEI message when gfv_cnt is greater than 0. 6) In one example, the flag NumTicksPocDiff1PresentFlag is specified that indicates whether the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS. a. In one example, the flag is derived. i. In a CVS of an AVC or VVC bitstream, NumTicksPocDiff1PresentFlag is always equal to 0, indicating that the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS. ii. In a CVS of an HEVC bitstream, NumTicksPocDiff1PresentFlag is set equal to ( vps_timing_info_present_flag | | vui_timing_info_present_flag ) && ( vps_poc_proportional_to_timing_flag | | vui_poc_proportional_to_timing_flag ). b. In one example, the flag is explicitly signalled in the GFV SEI message when gfv_cnt is greater than 0. 7) To solve problem 1, in one example, it is specified that, the output order of GFV-generated pictures corresponding to the GFV SEI messages in a picture unit with the same gfv_id value and different gfv_cnt values shall be in increasing order of the gfv_cnt values. 8) To solve problem 2, in one example, it is specified that, for any two pictures picA and picB wherein picA precedes picB in output order, any GFV-generated picture corresponding to a GFV SEI message with a particular gfv_id value and associated with picA shall precede, in output order, any GFV-generated picture corresponding to a GFV SEI message with the particular gfv_id value and associated with picB. a. In one example, it is specified that, for any two pictures picA and picB wherein picA precedes picB in decoding order, any GFV-generated picture corresponding to a GFV SEI message with a particular gfv_id value and associated with picA shall precede, in output order, any GFV-generated picture corresponding to a GFV SEI message with the particular gfv_id value and associated with picB.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 9) To solve problem 3, in one example, when gfv_cnt is greater than 0, an indication that indicates the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message is signalled in the GFV SEI message. a. In one example, the indication indicates the difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message minus 1. i. In one example, let currGfvId and currGfvCnt be the gfv_id and gfv_cnt, respectively, of the current GFV SEI message, the second GFV SEI message is the GFV SEI message that is in same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt − 1. 1. In one example, the indication is a syntax element, e.g., named gfv_poc_delta_minus1, that is ue(v)-coded. a. In one example, let prevPocVal be the picture order count value of the picture to be generated corresponding to the second GFV SEI message. The picture order count value of the picture to be generated corresponding to the current GFV SEI message is equal to prevPocVal + gfv_poc_delta_minus1 + 1. b. In one example, the indication indicates the difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message. c. In one example, the indication per any of the above subitems of item 9 is only signalled when it is indicated by a flag, e.g., named fixed_poc_diff_flag, e.g., when fixed_poc_diff_flag is equal to 0, that the difference between currPoc, i.e., the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message (with gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt), and prevPoc, i.e., the picture order count value of the GFV-generated picture corresponding to the previous GFV SEI message (with gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt − 1) in the same picture unit, may be different for different values of currGfvCnt greater than 0. i. In one example, when the flag fixed_poc_diff_flag is equal to 1, which indicates that the difference between currPoc and prevPoc is the same for any value of currGfvCnt greater than 0, an inidcation of the fixed difference between currPoc and prevPoc is not signalled when gfv_cnt is greater than 0 but is signalled when gfv_cnt is equal to 0. ii. In one example, the flag fixed_poc_diff_flag is signalled in each GFV SEI message with gfv_cnt is equal to 0 but applies to all GFV SEI messages with the same gfv_id in the same picture.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) iii. In one example, the flag fixed_poc_diff_flag is signalled in the GFV SEI message with gfv_cnt is equal to 0 in the first picture unit of a CLVS but applies to all GFV SEI messages with the same gfv_id in the CLVS. iv. In one example, the flag fixed_poc_diff_flag is not signalled but inferred to be equal to 1. 1. In one example, not only the flag fixed_poc_diff_flag is not signalled and is inferred to be equal to 1, but also the fixed diference between currPoc and prevPoc is not signalled and is inferred to be equal to a particular value, e.g., 1. 10) To solve problem 3, in one example, an indication that indicates a number of clock ticks corresponding to a difference of picture order count values equal to 1 may be signalled in the GFV SEI message. a. In one example, the indication is signalled only when gfv_cnt is equal to 0. i. In one example, the indication applies to the picture order count values of the pictures to be generated corresponding to the current GFV SEI message and the subsequent GFV SEI messages in decoding order in the current picture unit with the same gfv_id value as the current GFV SEI message and gfv_cnt greater than 0. ii. In one example, the indication is signalled using a ue(v)-coded syntax element, e.g., named gfv_num_ticks_poc_diff_one_minus1. 1. In one example, the syntax element gfv_num_ticks_poc_diff_one_minus1 is conditionally signalled based on at least a flag, e.g., named gfv_num_ticks_poc_diff_one_present_flag. a. In one example, it is specified that, when in the current picture unit there are GFV SEI messages with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag may be required to be equal to 1. b. In one example, it is specified that, when in the current picture unit there is no GFV SEI message with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag may be recommended to be equal to 0. c. In one example, it is specified that, when in the current picture unit there is no GFV SEI message with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag may be required to be equal to 0. d. In one example, the flag gfv_num_ticks_poc_diff_one_present_flag is conditionally signalled based at least on whether timing information is present for the CVS and whether a specific timing information of theAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS. e. In one example, the flag gfv_num_ticks_poc_diff_one_present_flag may be signalled only when timing information is present for the CVS (e.g., denoted by TimingInfoPresentFlag equal to 1) and the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS (e.g., denoted by NumTicksPocDiff1PresentFlag equal to 0). i. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and the current picture unit is the first picture unit of the current CLVS in decoding order, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1. ii. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and the current picture unit contains an IRAP picture, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1. iii. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and the current picture unit contains a gradual decoding refresh (GDR) picture, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1. iv. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and the current picture unit is associated with a recovery point SEI message, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1. v. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1:Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 1. The current picture unit is the first picture unit of the current CLVS in decoding order. 2. The current picture unit contains an IRAP picture. vi. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1: 1. The current picture unit is the first picture unit of the current CLVS in decoding order. 2. The current picture unit contains an IRAP picture. 3. The current picture unit contains a gradual decoding refresh (GDR) picture. vii. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1: 1. The current picture unit is the first picture unit of the current CLVS in decoding order. 2. The current picture unit contains an IRAP picture. 3. The current picture unit is associated with a recovery point SEI message. viii. In one example, it is specified that, when gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1: 1. The current picture unit is the first picture unit of the current CLVS in decoding order. 2. The current picture unit contains an IRAP picture. 3. The current picture unit contains a gradual decoding refresh (GDR) picture. 4. The current picture unit is associated with a recovery point SEI message.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) ix. In one example, for any of the above items i to viii, an additional condition is added: the CLVS contains at least one GFV SEI message with gfv_cnt greater than 0. x. In one example, for any of the above items i to viii, an additional condition is added: the CLVS contains at least one GFV SEI message with gfv_cnt greater than 0 in the current picture unit or after the current picture unit in decoding order. f. In one example, the flag gfv_num_ticks_poc_diff_one_present_flag is conditionally signalled based at least on whether timing information is present for the CVS. g. In one example, the flag gfv_num_ticks_poc_diff_one_present_flag may be signalled only when timing information is present for the CVS. 2. In one example, the indication syntax element gfv_num_ticks_poc_diff_one_minus1 is conditionally signalled based at least on whether timing information is present for the CVS and whether a specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS. 3. In one example, the indication syntax element gfv_num_ticks_poc_diff_one_minus1 may be signalled only when timing information is present for the CVS and the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS. 4. In one example, the indication syntax element gfv_num_ticks_poc_diff_one_minus1 is conditionally signalled based at least on whether timing information is present for the CVS. 5. In one example, the indication syntax element gfv_num_ticks_poc_diff_one_minus1 may be signalled only when timing information is present for the CVS. b. In one example, the indication is signalled only when gfv_cnt is greater than 0. c. In one example, the indication is not signalled and the number of clock ticks corresponding to a difference of picture order count values equal to 1 is inferred to be equal to a particular value, e.g., 1. 11) To solve problem 3, in one example, when gfv_cnt is greater than 0, an indication that indicates the output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEI message relative to the output time of the GFV-generated picture corresponding to a second GFV SEI message is signalled in the GFV SEI message. a. In one example, let currGfvId and currGfvCnt be the gfv_id and gfv_cnt, respectively, of the current GFV SEI message, the second GFV SEI message is the GFV SEI message that is in same picture unitAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt − 1. b. In one example, the indication is signalled only when timing information is present for the CVS. c. In one example, the indication is not signalled and the output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEI message relative to the output time of the GFV-generated picture corresponding to a second GFV SEI message as specified above is inferred to be equal to a particular value, e.g., 1. 6. Embodiments

[0194] Below are some example embodiments for the aspects summarized above in Section 5. 6.1 First embodiment 8.37.1 Generative face video SEI message syntax generative_face_video ( payloadSize ) { DescriptorAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) }. . g

[0195] The generative face video (GFV) SEI message indicates facial parameters and specifies a facial parameter translator network, denoted as TranslatorNN( ), that may be used to convert various formats of facial parameters signaled in the SEI message into a fixed format of parameters, and a face picture generator neural network, denoted as GenerativeNN( ), that may be used to generate output pictures using the fixed format of facial parameters and previously decoded output pictures.

[0196] NOTE 1 – Facial parameters could be determined from source pictures prior to encoding. Such source pictures may be referred to as driving pictures.

[0197] NOTE 2 – Previously decoded output pictures input to GenerativeNN( ) may be a base picture (a decoded output picture that provides the reference texture from which the face pictures may be generated) and, optionally, a picture that can be fused by GenerativeNN( ) to improve background texture and facial details. When the current picture is not a base picture, the GFV SEI message may be used to generate a face picture based on the previously decoded base picture, the facial parameters conveyed by the GFV SEI message, and, optionally, the current decoded picture for fusion purpose.

[0198] Use of this SEI message requires the definition of the following variables: - Input picture width and height in units of luma samples, denoted herein by CroppedWidth and CroppedHeight, respectively. - Luma sample array baseCroppedYPic and chroma sample arrays baseCroppedCbPic and baseCroppedCrPic for a decoded output picture, denoted as BasePicture, corresponding to a source base picture. - Luma sample array driveCroppedYPic and chroma sample arrays driveCroppedCbPic and driveCroppedCrPic for a decoded output picture, denoted as DrivePicture, corresponding to a source driving picture. - Bit depth BitDepthY for the luma sample array of the input pictures. - Bit depth BitDepthCfor the chroma sample arrays, if any, of the input pictures.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) - A chroma format indicator, denoted herein by ChromaFormatIdc, as described in subclause 7.3. - A picture order count (POC), denoted herein by PicOderCnt, that is associated with each picture, uniquely identifies the associated picture among all pictures in the CVS, and, when the associated picture is to be output, indicates the position of the associated picture in output order relative to the output order positions of the other pictures in the same CVS that are to be output. - A clock tick, denoted herein by ClockTick, representing the number of time units of a clock operating at a particular frequency that corresponds to one increment of a clock tick counter. - A flag, denoted herein by TimingInfoPresentFlag, indicating whether timing information is present for the CVS. If timing information is present for the CVS, TimingInfoPresentFlag is equal to 1. Otherwise, TimingInfoPresentFlag is equal to 0. - A flag, denoted herein by NumTicksPocDiff1PresentFlag, indicating whether the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS. ...

[0199] GenerativeNN ( ) is a process to generate the sample values of an output picture corresponding to a driving picture. It is only invoked when gfc_base_pic_flag is equal to 0. Input values to GenerativeNN( ) and output values from GenerativeNN( ) are real numbers.

[0200] Inputs to GenerativeNN() are: – When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 0 and ChromaFormatIdc is equal to 0: inputBaseY, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix – When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 0 and ChromaFormatIdc is not equal to 0: inputBaseY, inputBaseCb, inputBaseCr, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix – When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 1 and ChromaFormatIdc is equal to 0: inputBaseY, inputDriveY, inputBaseKeyPoint, inputBaseMatrix, inputDriveKeyPoint, inputDriveMatrix – When gfv_base_pic_flag is equal to 0 and gfv_drive_pic_fusion_flag is equal to 1 and ChromaFormatIdc is not equal to 0: inputBaseY, inputBaseCb, inputBaseCr, inputDriveY, inputDriveCb, inputDriveCr , inputBaseKeyPoint, inputBaseMatrix,, inputDriveKeyPoint, inputDriveMatrix

[0201] Outputs of GenerativeNN( ) are: – A luma sample array genY – When ChromaFormatIdc is not equal to 0, two chroma sample arrays genCb and genCr.

[0202] The process StoreOutputTensors( ) for deriving the output is specified as follows (each output picture derived by the process StoreOutputTensors( ) is referred to as a GFV-generated picture):Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) when gfv_base_pic_flag is equal to 0, the output sample array outYPic[ x ][ y ], outCbPic[ x ][ y ], and outCrPic[ x ][ y ] are derived as follows: for(x=0; x< CroppedWidth; x++){ for(y=0; y< CroppedHeight; y++){ outputYPic[ x ][ y ] = OutY( genY[ x ][ y ] ) } } if(ChromaFormatIdc != 0) { for(x=0; x< CroppedWidth / SubWidthC; x++){ for(y=0; y< CroppedHeight / SubHeightC; y++){ outputCbPic[ x ][ y ] = OutC( genCb[ x ][ y ] ) outputCrPic[ x][ y ] = OutC( genCr[ x ][ y ] ) } } } when gfv_base_pic_flag is equal to 1, the output sample array outYPic[ x ][ y ], outCbPic[ x ][ y ], and outCrPic[ x ][ y ] are derived as follows: for(x=0; x< CroppedWidth; x++){ for(y=0; y< CroppedHeight; y++){ outputYPic[ x ][ y ] = baseCroppedYPic [ x ][ y ] } } if(ChromaFormatIdc != 0) { for(x=0; x< CroppedWidth / SubWidthC; x++){ for(y=0; y< CroppedHeight / SubHeightC; y++){ outputCbPic[ x ][ y ] = baseCroppedCbPic [ x ][ y ] outputCrPic[ x][ y ] = baseCroppedCbPic [ x ][ y ] } } } where the functions OutY( ) and OutC( ) are specified as follows: OutY( x ) = Clip3( 0, ( 1 << BitDepthY) – 1 , x * ( ( 1 << BitDepthY) – 1 ) OutC( x ) = Clip3( 0, ( 1 << BitDepthC) – 1 , x * ( ( 1 << BitDepthC) – 1 )

[0203] gfv_poc_delta_minus1 indicates the picture order count value of the picture to be generated corresponding to the current GFV SEI message. The value of gfv_poc_delta_minus1 shall be in the range of 0 to 216− 1, inclusive.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0204] Let currGfvId and currGfvCnt be the gfv_id and gfv_cnt, respectively, of the current GFV SEI message, prevGfvSEImsg be the GFV SEI message that is in same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt − 1, prevPocVal be the picture order count value of the picture to be generated corresponding to prevGfvSEImsg. The picture order count value of the picture to be generated corresponding to the current GFV SEI message is equal to prevPocVal + gfv_poc_delta_minus1 + 1.

[0205] gfv_num_ticks_poc_diff_one_present_flag equal to 1 specifies that gfv_num_ticks_poc_diff_one_minus1 is present. gfv_num_ticks_poc_diff_one_present_flag equal to 0 specifies that gfv_num_ticks_poc_diff_one_minus1 is not present. When gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and in the current picture unit there are GFV SEI messages with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1. When gfv_cnt is equal to 0, TimingInfoPresentFlag is equal to 1, NumTicksPocDiff1PresentFlag is equal to 0, and in the current picture unit there is no GFV SEI message with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag should be equal to 0.

[0206] gfv_num_ticks_poc_diff_one_minus1 plus 1 indicates the number of clock ticks corresponding to a difference of picture order count values equal to 1 that applies to the picture order count values of the pictures to be generated corresponding to the current GFV SEI message and the subsequent GFV SEI messages in decoding order in the current picture unit with the same gfv_id value as the current GFV SEI message and gfv_cnt greater than 0. The value of gfv_num_ticks_poc_diff_one_minus1 shall be in the range of 0 to 232− 2, inclusive. 7. References [1] ITU-T and ISO / IEC, “High efficiency video coding”, Rec. ITU-T H.265 | ISO / IEC 23008-2 (in force edition). [2] ITU-T and ISO / IEC, “Versatile Video Coding”, Rec. ITU-T H.266 | ISO / IEC 23090-3. [3] ITU-T and ISO / IEC, “Versatile Supplemental Enhancement Information Messages for Coded Video Bitstreams”, Rec. ITU-T Rec. H.274 | ISO / IEC 23002-7. [4] S. McCarthy, J. Chen, S. Deshpande, M. M. Hannuksela, Hendry (eds), “Technologies under consideration for future extensions of VSEI (version 3),” JVET output document JVET-AG2032, publicly available online herein: https: / / jvet-experts.org / doc_end_user / documents / 33_Teleconference / wg11 / JVET-AG2032-v1.zip.

[0207] FIG.2 is a block diagram showing an example video processing system 4000 in which various techniques disclosed herein may be implemented. Various implementations may include some or all of the components of the system 4000. The system 4000 may include input 4002 for receiving video content. The video content may be received in a raw or uncompressed format, e.g., 8 or 10 bit multi-component pixel values, or may be in a compressed or encoded format. The input 4002 may represent a network interface, a peripheral bus interface, or a storage interface. Examples of network interface include wired interfaces such as Ethernet, passive optical network (PON), etc. and wireless interfaces such as wireless fidelity (Wi-Fi) or cellular interfaces.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0208] The system 4000 may include a coding component 4004 that may implement the various coding or encoding methods described in the present disclosure. The coding component 4004 may reduce the average bitrate of video from the input 4002 to the output of the coding component 4004 to produce a coded representation of the video. The coding techniques are therefore sometimes called video compression or video transcoding techniques. The output of the coding component 4004 may be either stored, or transmitted via a communication connected, as represented by the component 4006. The stored or communicated bitstream (or coded) representation of the video received at the input 4002 may be used by a component 4008 for generating pixel values or displayable video that is sent to a display interface 4010. The process of generating user-viewable video from the bitstream representation is sometimes called video decompression. Furthermore, while certain video processing operations are referred to as “coding” operations or tools, it will be appreciated that the coding tools or operations are used at an encoder and corresponding decoding tools or operations that reverse the results of the coding will be performed by a decoder.

[0209] Examples of a peripheral bus interface or a display interface may include universal serial bus (USB) or high definition multimedia interface (HDMI) or Displayport, and so on. Examples of storage interfaces include serial advanced technology attachment (SATA), peripheral component interconnect (PCI), integrated drive electronics (IDE) interface, and the like. The techniques described in the present disclosure may be embodied in various electronic devices such as mobile phones, laptops, smartphones or other devices that are capable of performing digital data processing and / or video display.

[0210] FIG.3 is a block diagram of an example video processing apparatus 4100. The apparatus 4100 may be used to implement one or more of the methods described herein. The apparatus 4100 may be embodied in a smartphone, tablet, computer, Internet of Things (IoT) receiver, and so on. The apparatus 4100 may include one or more processors 4102, one or more memories 4104 and video processing circuitry 4106. The processor(s) 4102 may be configured to implement one or more methods described in the present disclosure. The memory (memories) 4104 may be used for storing data and code used for implementing the methods and techniques described herein. The video processing circuitry 4106 may be used to implement, in hardware circuitry, some techniques described in the present disclosure. In some embodiments, the video processing circuitry 4106 may be at least partly included in the processor 4102, e.g., a graphics co-processor.

[0211] FIG.4 is a flowchart for an example method 4200 of video processing. The method 4200 determines that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)- generated picture at step 4202. A conversion is performed between a visual media data and a bitstream based on the StoreOutputTensors( ) process at step 4204. The conversion may include encoding at an encoder, decoding at a decoder, or combinations thereof.

[0212] It should be noted that the method 4200 can be implemented in an apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, such as video encoder 4400, video decoder 4500, and / or encoder 4600. In such a case, the instructions upon execution by the processor, cause the processor to perform the method 4200. Further, the method 4200 can be performed by a non-transitory computer readable medium comprising a computer program product for use by a video coding device. The computer program product comprisesAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) computer executable instructions stored on the non-transitory computer readable medium such that when executed by a processor cause the video coding device to perform the method 4200.

[0213] FIG. 5 is a block diagram that illustrates an example video coding system 4300 that may utilize the techniques of this disclosure. The video coding system 4300 may include a source device 4310 and a destination device 4320. Source device 4310 generates encoded video data which may be referred to as a video encoding device. Destination device 4320 may decode the encoded video data generated by source device 4310 which may be referred to as a video decoding device.

[0214] Source device 4310 may include a video source 4312, a video encoder 4314, and an input / output (I / O) interface 4316. Video source 4312 may include a source such as a video capture device, an interface to receive video data from a video content provider, and / or a computer graphics system for generating video data, or a combination of such sources. The video data may comprise one or more pictures. Video encoder 4314 encodes the video data from video source 4312 to generate a bitstream. The bitstream may include a sequence of bits that form a coded representation of the video data. The bitstream may include coded pictures and associated data. The coded picture is a coded representation of a picture. The associated data may include sequence parameter sets, picture parameter sets, and other syntax structures. I / O interface 4316 may include a modulator / demodulator (modem) and / or a transmitter. The encoded video data may be transmitted directly to destination device 4320 via I / O interface 4316 through network 4330. The encoded video data may also be stored onto a storage medium / server 4340 for access by destination device 4320.

[0215] Destination device 4320 may include an I / O interface 4326, a video decoder 4324, and a display device 4322. I / O interface 4326 may include a receiver and / or a modem. I / O interface 4326 may acquire encoded video data from the source device 4310 or the storage medium / server 4340. Video decoder 4324 may decode the encoded video data. Display device 4322 may display the decoded video data to a user. Display device 4322 may be integrated with the destination device 4320, or may be external to destination device 4320, which can be configured to interface with an external display device.

[0216] Video encoder 4314 and video decoder 4324 may operate according to a video compression standard, such as the High Efficiency Video Coding (HEVC) standard, Versatile Video Coding (VVC) standard and other current and / or further standards.

[0217] FIG. 6 is a block diagram illustrating an example of video encoder 4400, which may be video encoder 4314 in the system 4300 illustrated in FIG. 5. Video encoder 4400 may be configured to perform any or all of the techniques of this disclosure. The video encoder 4400 includes a plurality of functional components. The techniques described in this disclosure may be shared among the various components of video encoder 4400. In some examples, a processor may be configured to perform any or all of the techniques described in this disclosure.

[0218] The functional components of video encoder 4400 may include a partition unit 4401, a prediction unit 4402 which may include a mode select unit 4403, a motion estimation unit 4404, a motion compensation unit 4405, an intra prediction unit 4406, a residual generation unit 4407, a transform processing unit 4408, a quantization unit 4409, an inverse quantization unit 4410, an inverse transform unit 4411, a reconstruction unit 4412, a buffer 4413, and an entropy encoding unit 4414.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0219] In other examples, video encoder 4400 may include more, fewer, or different functional components. In an example, prediction unit 4402 may include an intra block copy (IBC) unit. The IBC unit may perform prediction in an IBC mode in which at least one reference picture is a picture where the current video block is located.

[0220] Furthermore, some components, such as motion estimation unit 4404 and motion compensation unit 4405 may be highly integrated, but are represented in the example of video encoder 4400 separately for purposes of explanation.

[0221] Partition unit 4401 may partition a picture into one or more video blocks. Video encoder 4400 and video decoder 4500 may support various video block sizes.

[0222] Mode select unit 4403 may select one of the coding modes, intra or inter, e.g., based on error results, and provide the resulting intra or inter coded block to a residual generation unit 4407 to generate residual block data and to a reconstruction unit 4412 to reconstruct the encoded block for use as a reference picture. In some examples, mode select unit 4403 may select a combination of intra and inter prediction (CIIP) mode in which the prediction is based on an inter prediction signal and an intra prediction signal. Mode select unit 4403 may also select a resolution for a motion vector (e.g., a sub-pixel or integer pixel precision) for the block in the case of inter prediction.

[0223] To perform inter prediction on a current video block, motion estimation unit 4404 may generate motion information for the current video block by comparing one or more reference frames from buffer 4413 to the current video block. Motion compensation unit 4405 may determine a predicted video block for the current video block based on the motion information and decoded samples of pictures from buffer 4413 other than the picture associated with the current video block.

[0224] Motion estimation unit 4404 and motion compensation unit 4405 may perform different operations for a current video block, for example, depending on whether the current video block is in an I slice, a P slice, or a B slice.

[0225] In some examples, motion estimation unit 4404 may perform uni-directional prediction for the current video block, and motion estimation unit 4404 may search reference pictures of list 0 or list 1 for a reference video block for the current video block. Motion estimation unit 4404 may then generate a reference index that indicates the reference picture in list 0 or list 1 that contains the reference video block and a motion vector that indicates a spatial displacement between the current video block and the reference video block. Motion estimation unit 4404 may output the reference index, a prediction direction indicator, and the motion vector as the motion information of the current video block. Motion compensation unit 4405 may generate the predicted video block of the current block based on the reference video block indicated by the motion information of the current video block.

[0226] In other examples, motion estimation unit 4404 may perform bi-directional prediction for the current video block, motion estimation unit 4404 may search the reference pictures in list 0 for a reference video block for the current video block and may also search the reference pictures in list 1 for another reference video block for the current video block. Motion estimation unit 4404 may then generate reference indexes that indicate the reference pictures in list 0 and list 1 containing the reference video blocks and motion vectors that indicate spatial displacements between the reference video blocks and the current video block. Motion estimation unit 4404 may output the reference indexes and the motion vectors of the current video block as the motion information of the current video block. Motion compensation unit 4405Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) may generate the predicted video block of the current video block based on the reference video blocks indicated by the motion information of the current video block.

[0227] In some examples, motion estimation unit 4404 may output a full set of motion information for decoding processing of a decoder. In some examples, motion estimation unit 4404 may not output a full set of motion information for the current video. Rather, motion estimation unit 4404 may signal the motion information of the current video block with reference to the motion information of another video block. For example, motion estimation unit 4404 may determine that the motion information of the current video block is sufficiently similar to the motion information of a neighboring video block.

[0228] In one example, motion estimation unit 4404 may indicate, in a syntax structure associated with the current video block, a value that indicates to the video decoder 4500 that the current video block has the same motion information as another video block.

[0229] In another example, motion estimation unit 4404 may identify, in a syntax structure associated with the current video block, another video block and a motion vector difference (MVD). The motion vector difference indicates a difference between the motion vector of the current video block and the motion vector of the indicated video block. The video decoder 4500 may use the motion vector of the indicated video block and the motion vector difference to determine the motion vector of the current video block.

[0230] As discussed above, video encoder 4400 may predictively signal the motion vector. Two examples of predictive signaling techniques that may be implemented by video encoder 4400 include advanced motion vector prediction (AMVP) and merge mode signaling.

[0231] Intra prediction unit 4406 may perform intra prediction on the current video block. When intra prediction unit 4406 performs intra prediction on the current video block, intra prediction unit 4406 may generate prediction data for the current video block based on decoded samples of other video blocks in the same picture. The prediction data for the current video block may include a predicted video block and various syntax elements.

[0232] Residual generation unit 4407 may generate residual data for the current video block by subtracting the predicted video block(s) of the current video block from the current video block. The residual data of the current video block may include residual video blocks that correspond to different sample components of the samples in the current video block.

[0233] In other examples, there may be no residual data for the current video block for the current video block, for example in a skip mode, and residual generation unit 4407 may not perform the subtracting operation.

[0234] Transform processing unit 4408 may generate one or more transform coefficient video blocks for the current video block by applying one or more transforms to a residual video block associated with the current video block.

[0235] After transform processing unit 4408 generates a transform coefficient video block associated with the current video block, quantization unit 4409 may quantize the transform coefficient video block associated with the current video block based on one or more quantization parameter (QP) values associated with the current video block.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0236] Inverse quantization unit 4410 and inverse transform unit 4411 may apply inverse quantization and inverse transforms to the transform coefficient video block, respectively, to reconstruct a residual video block from the transform coefficient video block. Reconstruction unit 4412 may add the reconstructed residual video block to corresponding samples from one or more predicted video blocks generated by the prediction unit 4402 to produce a reconstructed video block associated with the current block for storage in the buffer 4413.

[0237] After reconstruction unit 4412 reconstructs the video block, the loop filtering operation may be performed to reduce video blocking artifacts in the video block.

[0238] Entropy encoding unit 4414 may receive data from other functional components of the video encoder 4400. When entropy encoding unit 4414 receives the data, entropy encoding unit 4414 may perform one or more entropy encoding operations to generate entropy encoded data and output a bitstream that includes the entropy encoded data.

[0239] FIG.7 is a block diagram illustrating an example of video decoder 4500 which may be video decoder 4324 in the system 4300 illustrated in FIG. 5. The video decoder 4500 may be configured to perform any or all of the techniques of this disclosure. In the example shown, the video decoder 4500 includes a plurality of functional components. The techniques described in this disclosure may be shared among the various components of the video decoder 4500. In some examples, a processor may be configured to perform any or all of the techniques described in this disclosure.

[0240] In the example shown, video decoder 4500 includes an entropy decoding unit 4501, a motion compensation unit 4502, an intra prediction unit 4503, an inverse quantization unit 4504, an inverse transformation unit 4505, a reconstruction unit 4506, and a buffer 4507. Video decoder 4500 may, in some examples, perform a decoding pass generally reciprocal to the encoding pass described with respect to video encoder 4400.

[0241] Entropy decoding unit 4501 may retrieve an encoded bitstream. The encoded bitstream may include entropy coded video data (e.g., encoded blocks of video data). Entropy decoding unit 4501 may decode the entropy coded video data, and from the entropy decoded video data, motion compensation unit 4502 may determine motion information including motion vectors, motion vector precision, reference picture list indexes, and other motion information. Motion compensation unit 4502 may, for example, determine such information by performing the AMVP and merge mode.

[0242] Motion compensation unit 4502 may produce motion compensated blocks, possibly performing interpolation based on interpolation filters. Identifiers for interpolation filters to be used with sub-pixel precision may be included in the syntax elements.

[0243] Motion compensation unit 4502 may use interpolation filters as used by video encoder 4400 during encoding of the video block to calculate interpolated values for sub-integer pixels of a reference block. Motion compensation unit 4502 may determine the interpolation filters used by video encoder 4400 according to received syntax information and use the interpolation filters to produce predictive blocks.

[0244] Motion compensation unit 4502 may use some of the syntax information to determine sizes of blocks used to encode frame(s) and / or slice(s) of the encoded video sequence, partition information that describes how each macroblock of a picture of the encoded video sequence is partitioned, modes indicating how each partition is encoded,Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) one or more reference frames (and reference frame lists) for each inter coded block, and other information to decode the encoded video sequence.

[0245] Intra prediction unit 4503 may use intra prediction modes for example received in the bitstream to form a prediction block from spatially adjacent blocks. Inverse quantization unit 4504 inverse quantizes, i.e., de-quantizes, the quantized video block coefficients provided in the bitstream and decoded by entropy decoding unit 4501. Inverse transform unit 4505 applies an inverse transform.

[0246] Reconstruction unit 4506 may sum the residual blocks with the corresponding prediction blocks generated by motion compensation unit 4502 or intra prediction unit 4503 to form decoded blocks. If desired, a deblocking filter may also be applied to filter the decoded blocks in order to remove blockiness artifacts. The decoded video blocks are then stored in buffer 4507, which provides reference blocks for subsequent motion compensation / intra prediction and also produces decoded video for presentation on a display device.

[0247] FIG.8 is a schematic diagram of an example encoder 4600. The encoder 4600 is suitable for implementing the techniques of VVC. The encoder 4600 includes three in-loop filters, namely a deblocking filter (DF) 4602, a sample adaptive offset (SAO) 4604, and an adaptive loop filter (ALF) 4606. Unlike the DF 4602, which uses predefined filters, the SAO 4604 and the ALF 4606 utilize the original samples of the current picture to reduce the mean square errors between the original samples and the reconstructed samples by adding an offset and by applying a finite impulse response (FIR) filter, respectively, with coded side information signaling the offsets and filter coefficients. The ALF 4606 is located at the last processing stage of each picture and can be regarded as a tool trying to catch and fix artifacts created by the previous stages.

[0248] The encoder 4600 further includes an intra prediction component 4608 and a motion estimation / compensation (ME / MC) component 4610 configured to receive input video. The intra prediction component 4608 is configured to perform intra prediction, while the ME / MC component 4610 is configured to utilize reference pictures obtained from a reference picture buffer 4612 to perform inter prediction. Residual blocks from inter prediction or intra prediction are fed into a transform (T) component 4614 and a quantization (Q) component 4616 to generate quantized residual transform coefficients, which are fed into an entropy coding component 4618. The entropy coding component 4618 entropy codes the prediction results and the quantized transform coefficients and transmits the same toward a video decoder (not shown). Quantization components output from the quantization component 4616 may be fed into an inverse quantization (IQ) components 4620, an inverse transform component 4622, and a reconstruction (REC) component 4624. The REC component 4624 is able to output images to the DF 4602, the SAO 4604, and the ALF 4606 for filtering prior to those images being stored in the reference picture buffer 4612.

[0249] A listing of solutions preferred by some examples is provided next.

[0250] The following solutions show examples of techniques discussed herein.

[0251] 1. A method for processing media data comprising: determining each output picture derived by a store output tensors (StoreOutputTensors( )) process, including an output picture derived for a generative face video (GFV) supplemental enhancement information (SEI) message with a GFV base picture flag (gfv_base_pic_flag) equal to 1, isAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) a GFV-generated picture; and performing a conversion between a visual media data and a bitstream based on StoreOutputTensors( ).

[0252] 2. The method of solution 1, wherein a GFV SEI message is associated with a picture when a picture unit containing the picture contains the GFV SEI message or the picture is within a persistence scope of the GFV SEI message.

[0253] 3. The method of any of solutions 1-2, wherein a picture order count is a variable associated with each picture that uniquely identifies an associated picture among all pictures in a coded video sequence (CVS), and wherein when the associated picture is to be output, the picture order count indicates a position of the associated picture in output order relative to output order positions of other pictures in the same CVS that are to be output.

[0254] 4. The method of any of solutions 1-3, wherein a clock tick is variable representing a number of time units of a clock operating at a particular frequency that corresponds to one increment of a clock tick counter.

[0255] 5. The method of any of solutions 1-4, wherein a timing information present flag (TimingInfoPresentFlag) indicates whether timing information is present, wherein the TimingInfoPresentFlag is equal to 1 when timing information is present, and wherein TimingInfoPresentFlag is otherwise equal to 0.

[0256] 6. The method of any of solutions 1-5, wherein the TimingInfoPresentFlag is derived, or wherein for a coded layer video sequence (CLVS) of an Advanced Video Coding (AVC) bitstream, TimingInfoPresentFlag is set equal to an AVC timing information present flag (timing_info_present_flag), or wherein for a CLVS of a high efficiency video coding (HEVC) bitstream, TimingInfoPresentFlag is set equal to video parameter set (VPS) timing information present flag (vps_timing_info_present_flag) or video usability information (VUI) timing information present flag (vui_timing_info_present_flag) denoted as ( vps_timing_info_present_flag | | vui_timing_info_present_flag ), or wherein in a CLVS of an versatile video coding (VVC) bitstream, TimingInfoPresentFlag is set equal to a VPS timing hypothtical reference decoder (HRD) parameters present flag (vps_timing_hrd_params_present_flag) or a sequence parameter set (SPS) timing HRD parameters present flag (sps_timing_hrd_params_present_flag) denoted as ( vps_timing_hrd_params_present_flag | | sps_timing_hrd_params_present_flag ), or wherein TimingInfoPresentFlag is explicitly signalled in the GFV SEI message when GFV count (gfv_cnt) is greater than 0.

[0257] 7. The method of any of solutions 1-6, wherein a number of ticks picture order count (POC) difference equal to one present flag (NumTicksPocDiff1PresentFlag) is specified that indicates whether specific timing information of a number of clock ticks corresponding to a difference of POC values equal to 1 is present for the CVS.

[0258] 8. The method of any of solutions 1-7, wherein NumTicksPocDiff1PresentFlag is derived, or wherein in a CVS of an AVC or VVC bitstream, NumTicksPocDiff1PresentFlag is always equal to 0, indicating that specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS, or wherein in a CVS of an HEVC bitstream, NumTicksPocDiff1PresentFlag is set equal to vps_timing_info_present_flag or vui_timing_info_present_flag and VPS POC proportional to timing flag flag asAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) ( vps_poc_proportional_to_timing_flag | | vui_poc_proportional_to_timing_flag ), or wherein NumTicksPocDiff1PresentFlag is explicitly signalled in the GFV SEI message when gfv_cnt is greater than 0.

[0259] 9. The method of any of solutions 1-8, wherein an output order of GFV-generated pictures corresponding to the GFV SEI messages in a picture unit with the same GFV identifier (gfv_id) value and different gfv_cnt values shall be in increasing order of the gfv_cnt values.

[0260] 10. The method of any of solutions 1-9, wherein for any two pictures picA and picB wherein picA precedes picB in output order, any GFV-generated picture corresponding to a GFV SEI message with a particular gfv_id value and associated with picA shall precede, in output order, any GFV-generated picture corresponding to a GFV SEI message with the particular gfv_id value and associated with picB.

[0261] 11. The method of any of solutions 1-10, wherein for any two pictures picA and picB wherein picA precedes picB in decoding order, any GFV-generated picture corresponding to a GFV SEI message with a particular gfv_id value and associated with picA shall precede, in output order, any GFV-generated picture corresponding to a GFV SEI message with the particular gfv_id value and associated with picB.

[0262] 12. The method of any of solutions 1-11, wherein when gfv_cnt is greater than 0, an indication that indicates the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message is signalled in the GFV SEI message.

[0263] 13. The method of any of solutions 1-12, wherein the indication indicates the difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message minus 1, or wherein currGfvId and currGfvCnt are the gfv_id and gfv_cnt, respectively, of the current GFV SEI message, a second GFV SEI message is a GFV SEI message that is in a same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt – 1, or wherein the indication is a syntax element, named GFV POC difference minus one (gfv_poc_delta_minus1), that is unsigned exponential-Golomb-coded value (ue(v))-coded, or wherein prevPocVal is a picture order count value of a picture to be generated corresponding to the second GFV SEI message and the POC value of the picture to be generated corresponding to the current GFV SEI message is equal to prevPocVal + gfv_poc_delta_minus1 + 1, or wherein the indication indicates a difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message.

[0264] 14. The method of any of solutions 1-13, wherein an indication that indicates a number of clock ticks corresponding to a difference of picture order count values equal to 1 is signalled in the GFV SEI message.

[0265] 15. The method of any of solutions 1-14, wherein the indication applies to the picture order count values of the pictures to be generated corresponding to the current GFV SEI message and the subsequent GFV SEI messages in decoding order in the current picture unit with the same gfv_id value as the current GFV SEI message and gfv_cnt greater than 0.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0266] 16. The method of any of solutions 1-15, wherein the indication is signalled using a ue(v)-coded syntax element named GFV number of ticks POC difference minus one (gfv_num_ticks_poc_diff_one_minus1), or wherein gfv_num_ticks_poc_diff_one_minus1 is conditionally signalled based on at least a flag named GFV number of ticks POC difference one present flag (gfv_num_ticks_poc_diff_one_present_flag), or wherein when in the current picture unit there are GFV SEI messages with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag may be required to be equal to 1, or wherien when in the current picture unit there is no GFV SEI message with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag may be recommended to be equal to 0, or wherein when in the current picture unit there is no GFV SEI message with same gfv_id as the current GFV SEI message and gfv_cnt greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag may be required to be equal to 0, or wherein the flag gfv_num_ticks_poc_diff_one_present_flag is conditionally signalled based at least on whether timing information is present for the CVS and whether a specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS, or wherein the flag gfv_num_ticks_poc_diff_one_present_flag may be signalled only when timing information is present for the CVS and the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS, or wherein the flag gfv_num_ticks_poc_diff_one_present_flag is conditionally signalled based at least on whether timing information is present for the CVS, or wherein the flag gfv_num_ticks_poc_diff_one_present_flag may be signalled only when timing information is present for the CVS.

[0267] 17. The method of any of solutions 1-16, wherein the indication syntax element gfv_num_ticks_poc_diff_one_minus1 is conditionally signalled based at least on whether timing information is present for the CVS and whether a specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS.

[0268] 18. The method of any of solutions 1-17, wherein the indication syntax element gfv_num_ticks_poc_diff_one_minus1 may be signalled only when timing information is present for the CVS and the specific timing information of the number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS.

[0269] 19. The method of any of solutions 1-18, wherein the indication syntax element gfv_num_ticks_poc_diff_one_minus1 is conditionally signalled based at least on whether timing information is present for the CVS.

[0270] 20. The method of any of solutions 1-19, wherein the indication syntax element gfv_num_ticks_poc_diff_one_minus1 may be signalled only when timing information is present for the CVS.

[0271] 21. The method of any of solutions 1-20, wherein the indication is signalled only when gfv_cnt is greater than 0.

[0272] 22. The method of any of solutions 1-21, wherein when gfv_cnt is greater than 0, an indication that indicates the output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEIAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) message relative to the output time of the GFV-generated picture corresponding to a second GFV SEI message is signalled in the GFV SEI message.

[0273] 23. The method of any of solutions 1-22, wherein currGfvId and currGfvCnt are the gfv_id and gfv_cnt, respectively, of the current GFV SEI message, the second GFV SEI message is the GFV SEI message that is in same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has gfv_id equal to currGfvId and gfv_cnt equal to currGfvCnt − 1.

[0274] 24. The method of any of solutions 1-23, wherein the indication is signalled only when timing information is present for the CVS.

[0275] 25. An apparatus for processing video data comprising: a processor; and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to perform the method of any of solutions 1-24.

[0276] 26. A non-transitory computer readable medium comprising a computer program product for use by a video coding device, the computer program product comprising computer executable instructions stored on the non- transitory computer readable medium such that when executed by a processor cause the video coding device to perform the method of any of solutions 1-24.

[0277] 27. A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises: determining each output picture derived by a store output tensors (StoreOutputTensors( )) process, including an output picture derived for a generative face video (GFV) supplemental enhancement information (SEI) message with a GFV base picture flag (gfv_base_pic_flag) equal to 1, is a GFV-generated picture; and generating a bitstream based on the determining.

[0278] 28. A method for storing bitstream of a video comprising: determining each output picture derived by a store output tensors (StoreOutputTensors( )) process, including an output picture derived for a generative face video (GFV) supplemental enhancement information (SEI) message with a GFV base picture flag (gfv_base_pic_flag) equal to 1, is a GFV-generated picture; generating a bitstream based on the determining; and storing the bitstream in a non- transitory computer-readable recording medium.

[0279] 29. A method, apparatus, or system described in the present disclosure.

[0280] In the solutions described herein, an encoder may conform to the format rule by producing a coded representation according to the format rule. In the solutions described herein, a decoder may use the format rule to parse syntax elements in the coded representation with the knowledge of presence and absence of syntax elements according to the format rule to produce decoded video.

[0281] In the present disclosure, the term “video processing” may refer to video encoding, video decoding, video compression or video decompression. For example, video compression algorithms may be applied during conversion from pixel representation of a video to a corresponding bitstream representation or vice versa. The bitstream representation of a current video block may, for example, correspond to bits that are either co-located or spread in different places within the bitstream, as is defined by the syntax. For example, a macroblock may be encoded in terms of transformed and coded error residual values and also using bits in headers and other fields in the bitstream.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) Furthermore, during conversion, a decoder may parse a bitstream with the knowledge that some fields may be present, or absent, based on the determination, as is described in the above solutions. Similarly, an encoder may determine that certain syntax fields are or are not to be included and generate the coded representation accordingly by including or excluding the syntax fields from the coded representation.

[0282] The disclosed and other solutions, examples, embodiments, modules and the functional operations described in this disclosure can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this disclosure and their structural equivalents, or in combinations of one or more of them. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus. The computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine- readable propagated signal, or a combination of one or more them. The term “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers. The apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. A propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus.

[0283] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code). A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.

[0284] The processes and logic flows described in this disclosure can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC).

[0285] Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random-access memory or both. The essential elements of a computer are a processor for performing instructions and one or more memory devices for storingAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks. However, a computer need not have such devices. Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and compact disc read-only memory (CD ROM) and Digital versatile disc-read only memory (DVD-ROM) disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.

[0286] While the present disclosure contains many specifics, these should not be construed as limitations on the scope of any subject matter or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of particular techniques. Certain features that are described in the present disclosure in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

[0287] Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Moreover, the separation of various system components in the embodiments described in the present disclosure should not be understood as requiring such separation in all embodiments.

[0288] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in the present disclosure.

[0289] A first component is directly coupled to a second component when there are no intervening components, except for a line, a trace, or another medium between the first component and the second component. The first component is indirectly coupled to the second component when there are intervening components other than a line, a trace, or another medium between the first component and the second component. The term “coupled” and its variants include both directly coupled and indirectly coupled. The use of the term “about” means a range including ±10% of the subsequent number unless otherwise stated.

[0290] While several embodiments have been provided in the present disclosure, it should be understood that the disclosed systems and methods might be embodied in many other specific forms without departing from the spirit or scope of the present disclosure. The present examples are to be considered as illustrative and not restrictive, and the intention is not to be limited to the details given herein. For example, the various elements or components may be combined or integrated in another system or certain features may be omitted, or not implemented.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W)

[0291] In addition, techniques, systems, subsystems, and methods described and illustrated in the various embodiments as discrete or separate may be combined or integrated with other systems, modules, techniques, or methods without departing from the scope of the present disclosure. Other items shown or discussed as coupled may be directly connected or may be indirectly coupled or communicating through some interface, device, or intermediate component whether electrically, mechanically, or otherwise. Other examples of changes, substitutions, and alterations are ascertainable by one skilled in the art and could be made without departing from the spirit and scope disclosed herein.

Claims

Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) CLAIMS What is claimed is:

1. A method for processing media data comprising: determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture; and performing a conversion between a visual media data and a bitstream based on the StoreOutputTensors( ) process.

2. The method of claim 1, wherein each output picture includes an output picture derived for a GFV supplemental enhancement information (SEI) message with a GFV base picture flag (gfv_base_pic_flag) equal to 1.

3. The method of any of claims 1-2, wherein an output order of GFV-output pictures corresponding to GFV SEI messages in a picture unit with a same GFV identification (gfv_id) value and different GFV count (gfv_cnt) values shall be in increasing order of the gfv_cnt values.

4. The method of any of claims 1-3, wherein for any two pictures (picA and picB), wherein the picA precedes the picB in the output order, any GFV-output picture corresponding to a GFV SEI message with a particular GFV identification (gfv_id) value and associated with the picA shall precede, in the output order, any GFV-output picture corresponding to a GFV SEI message with the particular GFV identification (gfv_id) value and associated with the picB.

5. The method of any of claims 1-3, wherein for any two pictures (picA and picB), wherein the picA precedes the picB in decoding order, any GFV-output picture corresponding to a GFV SEI message with a particular GFV identification (gfv_id) value and associated with the picA shall precede, in the output order, any GFV-output picture corresponding to a GFV SEI message with the particular GFV identification (gfv_id) value and associated with the picB.

6. The method of any of claims 1-5, wherein a GFV SEI message is said to be associated with a picture when a picture unit containing the picture contains the GFV SEI message or when the picture is within a persistence scope of the GFV SEI message.

7. The method of any of claims 1-6, wherein a picture order count is a variable that is associated with each picture, uniquely identifies the associated picture among all pictures in a coded video sequence (CVS), and, when the associated picture is to be output, indicates a position of the associated picture in output order relative to output order positions of other pictures in the same CVS that are to be output.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 8. The method of any of claims 1-7, wherein a clock tick comprises a variable representing a number of time units of a clock operating at a particular frequency that corresponds to one increment of a clock tick counter.

9. The method of any of claims 1-8, wherein a flag (TimingInfoPresentFlag) is specified to indicate whether timing information is present.

10. The method of claim 9, wherein when the timing information is present, the flag (TimingInfoPresentFlag) is equal to 1, and when the timing information is not present, the flag (TimingInfoPresentFlag) is equal to 0.

11. The method of any of claims 9-10, wherein the flag (TimingInfoPresentFlag) is a derived variable.

12. The method of claim 11, wherein for a coded layer video sequence (CLVS) of an Advanced Video Coding (AVC) bitstream, the flag (TimingInfoPresentFlag) is set equal to a timing information present syntax element (timing_info_present_flag).

13. The method of claim 11, wherein for a coded layer video sequence (CLVS) of a High Efficiency Video Coding (HEVC) bitstream, the flag (TimingInfoPresentFlag) is set equal to a video parameter set timing information present flag syntax element or a visual usability information timing information present flag syntax element (vps_timing_info_present_flag | | vui_timing_info_present_flag ).

14. The method of claim 11, wherein for a coded layer video sequence (CLVS) of a Versatile Video Coding (VVC) bitstream, the flag (TimingInfoPresentFlag) is set equal to a video parameter set timing hypothetical reference decoder (HRD) parameters present flag syntax element or a sequence parameter set timing HRD parameters present flag syntax element ( vps_timing_hrd_params_present_flag | | sps_timing_hrd_params_present_flag ).

15. The method of any of claims 9-10, wherein the flag (TimingInfoPresentFlag) is a syntax element explicitly included in the GFV SEI message when a GFV count (gfv_cnt) is greater than 0.

16. The method of any of claims 1-15, wherein a flag (NumTicksPocDiff1PresentFlag) is specified to indicate whether specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for a coded video sequence (CVS).

17. The method of claim 16, wherein the flag (NumTicksPocDiff1PresentFlag) is a derived variable.

18. The method of any of claims 16-17, wherein in the CVS of an Advanced Video Coding (AVC) bitstream or a Versatile Video Coding (VVC) bitstream, the flag (NumTicksPocDiff1PresentFlag) is always equal to 0, whichAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) indicates that the specific timing information of the number of clock ticks corresponding to the difference of the picture order count values equal to 1 is not present for the CVS.

19. The method of any of claims 16-17, wherein in the CVS of a High Efficiency Video Coding (HEVC) bitstream, the flag (NumTicksPocDiff1PresentFlag) is set equal to a video parameter set timing information present flag syntax element or a visual usability information timing information present flag syntax element, and a video parameter set picture order count proportional to timing flag or a visual usability information picture order count proportional to timing flag ( vps_timing_info_present_flag | | vui_timing_info_present_flag ) && ( vps_poc_proportional_to _timing_flag | | vui_poc_proportional_to_timing_flag ).

20. The method of claim 16, wherein the flag (TimingInfoPresentFlag) is a syntax element explicitly included in the GFV SEI message when a GFV count (gfv_cnt) is greater than 0.

21. The method of any of claims 1-20, wherein when a GFV count (gfv_cnt) is greater than 0, an indication that indicates a picture order count value of the GFV-generated picture corresponding to a current GFV SEI message is included in the current GFV SEI message.

22. The method of claim 21, wherein the indication indicates a difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message minus 1.

23. The method of claim 22, wherein a current GFV identification (currGfvId) and a current GFV count (currGfvCnt) are the gfv_id and the gfv_cnt, respectively, of the current GFV SEI message, and wherein the second GFV SEI message is the GFV SEI message that is in a same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has the gfv_id equal to the currGfvId and the gfv_cnt equal to the currGfvCnt − 1.

24. The method of claim 23, wherein the indication is a syntax element designated gfv_poc_delta_minus1, and wherein the syntax element is an unsigned exponential-Golomb-coded value of a variable number of bits (ue(v)).

25. The method of claim 24, wherein prevPocVal is the picture order count value of the picture to be generated corresponding to the second GFV SEI message, and wherein the picture order count value of the picture to be generated corresponding to the current GFV SEI message is equal to the prevPocVal + gfv_poc_delta_minus1 + 1.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 26. The method of claim 21, wherein the indication indicates a difference between the picture order count value of the GFV-generated picture corresponding to the current GFV SEI message and the picture order count value of the GFV-generated picture corresponding to a second GFV SEI message.

27. The method of any of claims 21-26, wherein the indication is only included in the bitstream when a flag indicates that a difference between a current picture order count (currPoc) value of the GFV-generated picture corresponding to the current GFV SEI message and a previous picture order count (prevPoc) value of the GFV- generated picture corresponding to the previous GFV SEI message in a same picture unit is different for different values of a current GFV count (currGfvCnt) greater than 0.

28. The method of claim 27, wherein the flag is designated fixed_poc_diff_flag, and wherein the flag has a value is equal to 0.

29. The method of any of claims 27-28, wherein the current GFV SEI message has a gfv_id equal to the currGfvId and the gfv_cnt is equal to the currGfvCnt.

30. The method of any of claims 27-29, wherein the previous GFV SEI message has a gfv_id equal to the currGfvId and the gfv_cnt is equal to currGfvCnt – 1.

31. The method of claim 27, wherein when the flag (fixed_poc_diff_flag) has a value equal to 1, which indicates that the difference between the currPoc and the prevPoc is the same for any value of the currGfvCnt greater than 0, an inidcation of a fixed difference between the currPoc and the prevPoc is not included in the bitstream when the gfv_cnt is greater than 0 but is included in the bitstream when the gfv_cnt is equal to 0.

32. The method of claim 27, wherein the flag (fixed_poc_diff_flag) is included in each GFV SEI message with the gfv_cnt equal to 0 but applies to all GFV SEI messages with a same gfv_id in a same picture.

33. The method of claim 27, wherein the flag (fixed_poc_diff_flag) is included in the GFV SEI message with the gfv_cnt equal to 0 in a first picture unit of a coded layer video sequence (CLVS) but applies to all GFV SEI messages with a same gfv_id in the CLVS.

34. The method of claim 27, wherein the flag (fixed_poc_diff_flag) is not included in the bitstream but is inferred to be equal to 1.

35. The method of claim 27, wherein the flag (fixed_poc_diff_flag) is not included in the bitstream but is inferred to be equal to 1, and wherein a fixed difference between the currPoc and the prevPoc is not included in the bitstream and is inferred to be equal to a particular value.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 36. The method of claim 35, wherein the particular value is 1.

37. The method of any of claims 1-36, wherein an indication that indicates a number of clock ticks corresponding to a difference of picture order count values equal to 1 is included in the GFV SEI message.

38. The method of claim 37, wherein the indication is included in the GFV SEI message only when the gfv_cnt is equal to 0.

39. The method of claim 38, wherein the indication applies to picture order count values of pictures to be generated corresponding to the current GFV SEI message and subsequent GFV SEI messages in decoding order in a current picture unit with a same gfv_id value as the current GFV SEI message and the gfv_cnt greater than 0.

40. The method of claim 38, wherein indication is a syntax element coded using an unsigned exponential-Golomb- coded value of a variable number of bits (ue(v)).

41. The method of claim 40, wherein the syntax element is designated gfv_num_ticks_poc_diff_one_minus1.

42. The method of any of claims 40-41, wherein the syntax element (gfv_num_ticks_poc_diff_one_minus1) is conditionally included in the GFV SEI message based on at least a flag designated gfv_num_ticks_poc_diff_one_present_flag.

43. The method of any of claims 40-41, wherein when there are GFV SEI messages with a same gfv_id as a current GFV SEI message in a current picture unit and the gfv_cnt is greater than 0, the value of the gfv_num_ticks_poc_diff_one_present_flag is required to be equal to 1.

44. The method of any of claims 40-41, wherein when there is no GFV SEI message with a same gfv_id as a current GFV SEI message in a current picture unit and the gfv_cnt is greater than 0, the value of the gfv_num_ticks_poc_diff_one_present_flag is recommended to be equal to 0.

45. The method of any of claims 40-41, wherein when there is no GFV SEI message with a same gfv_id as a current GFV SEI message in a current picture unit and the gfv_cnt is greater than 0, the value of gfv_num_ticks_poc_diff_one_present_flag is required to be equal to 0.

46. The method of any of claims 40-41, wherein a flag (gfv_num_ticks_poc_diff_one_present_flag) is conditionally included in the GFV SEI message based at least on whether timing information is present for a codedAtty Docket 4824-56602 (P24072423699WO1; G25N14419W) video sequence (CVS) and whether a specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS.

47. The method of any of claims 40-41, wherein a flag (gfv_num_ticks_poc_diff_one_present_flag) is included in the GFV SEI message only when timing information is present for a coded video sequence (CVS) and specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS.

48. The method of claim 47, wherein the timing information for the CVS is designated TimingInfoPresentFlag and has a value equal to 1.

49. The method of claim 47, wherein the specific timing information of the number of clock ticks is designated NumTicksPocDiff1PresentFlag and has a value equal to 0.

50. The method of any of claims 48-49, wherein when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order, a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

51. The method of any of claims 48-49, wherein when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit contains an intra random access point (IRAP) picture, a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

52. The method of any of claims 48-49, wherein when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit contains a gradual decoding refresh (GDR) picture, a value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

53. The method of any of claims 48-49, wherein when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and a current picture unit is associated with a recovery point SEI message, a value of gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1.

54. The method of any of claims 48-49, wherein a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order; and a current picture unit contains an intra random access point (IRAP) picture.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 55. The method of any of claims 48-49, wherein a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is the first picture unit of the current coded layer video sequence (CLVS) in decoding order; a current picture unit contains an intra random access point (IRAP) picture; and a current picture unit contains a gradual decoding refresh (GDR) picture.

56. The method of any of claims 48-49, wherein a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order; a current picture unit contains an intra random access point (IRAP) picture; and a current picture unit is associated with a recovery point SEI message.

57. The method of any of claims 48-49, wherein a value of the gfv_num_ticks_poc_diff_one_present_flag shall be equal to 1 when the gfv_cnt is equal to 0, the TimingInfoPresentFlag is equal to 1, the NumTicksPocDiff1PresentFlag is equal to 0, and any of the following conditions is true: a current picture unit is a first picture unit of a current coded layer video sequence (CLVS) in decoding order; a current picture unit contains an intra random access point (IRAP) picture; a current picture unit contains a gradual decoding refresh (GDR) picture; and a current picture unit is associated with a recovery point SEI message.

58. The method of any of claims 50-57, wherein an additional condition is added: a coded layer video sequence (CLVS) contains at least one GFV SEI message with the gfv_cnt greater than 0.

59. The method of any of claims 50-57, wherein an additional condition is added: a coded layer video sequence (CLVS) contains at least one GFV SEI message with the gfv_cnt greater than 0 in a current picture unit or after the current picture unit in decoding order.

60. The method of any of claims 40-41, wherein the flag gfv_num_ticks_poc_diff_one_present_flag is conditionally included in the GFV SEI message based at least on whether timing information is present for a coded video sequence (CVS).

61. The method of any of claims 40-41, wherein the flag gfv_num_ticks_poc_diff_one_present_flag may be signalled only when timing information is present for a coded video sequence (CVS).Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 62. The method of any of claims 37-61, wherein the syntax element (gfv_num_ticks_poc_diff_one_minus1) is conditionally included in the GFV SEI message based at least on whether timing information is present for a coded video sequence (CVS) and whether specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is present for the CVS.

63. The method of any of claims 37-61, wherein the syntax element (gfv_num_ticks_poc_diff_one_minus1) is included in the GFV SEI message only when timing information is present for a coded video sequence (CVS) and specific timing information of a number of clock ticks corresponding to a difference of picture order count values equal to 1 is not present for the CVS.

64. The method of any of claims 37-61, wherein the syntax element (gfv_num_ticks_poc_diff_one_minus1) is conditionally included in the GFV SEI message based at least on whether timing information is present for the CVS.

65. The method of any of claims 37-61, wherein the syntax element (gfv_num_ticks_poc_diff_one_minus1) is included in the GFV SEI message only when timing information is present for the CVS.

66. The method of any of claims 37-65, wherein the indication is included in the GFV SEI message only when the gfv_cnt is greater than 0.

67. The method of any of claims 37-65, wherein the indication is not included in the GFV SEI message and a number of clock ticks corresponding to a difference of picture order count values equal to 1 is inferred to be equal to a particular value.

68. The method of claim 67, wherein the particular value is 1.

69. The method of any of claims 1-68, wherein when the gfv_cnt is greater than 0, an indication that indicates an output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEI message relative to an output time of the GFV-generated picture corresponding to a second GFV SEI message is included in the GFV SEI message.

70. The method of claim 69, wherein a current GFV identification (currGfvId) and a current GFV count (currGfvCnt) are the gfv_id and the gfv_cnt, respectively, of the current GFV SEI message, and wherein the second GFV SEI message is the GFV SEI message that is in a same picture unit as the current GFV SEI message, precedes the current GFV SEI message in decoding order, and has the gfv_id equal to the currGfvId and the gfv_cnt equal to the currGfvCnt − 1.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 71. The method of any of claims 69-70, wherein the indication is included in the GFV SEI message only when timing information is present for a coded video sequence (CVS).

72. The method of any of claims 69-71, wherein the indication is not included in the GFV SEI message and an output delay, in units of clock ticks, of the GFV-generated picture corresponding to the current GFV SEI message relative to the output time of the GFV-generated picture corresponding to a second GFV SEI message is inferred to be equal to a particular value.

73. The method of claim 72, wherein the particular value is 1.

74. The method of any of claims 1-73, wherein the conversion includes encoding the visual media data into the bitstream.

75. The method of any of claims 1-73, wherein the conversion includes decoding the visual media data from the bitstream.

76. An apparatus for processing video data comprising: a processor; and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to perform the method of any of claims 1-75.

77. A non-transitory computer readable medium comprising a computer program product for use by a video coding device, the computer program product comprising computer executable instructions stored on the non-transitory computer readable medium such that when executed by a processor cause the video coding device to perform the method of any of claims 1-75.

78. A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises: determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture; and performing a conversion between a visual media data and a bitstream based on the StoreOutputTensors( ) process.

79. A method for storing bitstream of a video comprising: determining that each output picture derived by a store output tensors (StoreOutputTensors( )) process is a generative face video (GFV)-generated picture; generating a bitstream based on the StoreOutputTensors( ) process; and storing the bitstream in a non-transitory computer-readable recording medium.Atty Docket 4824-56602 (P24072423699WO1; G25N14419W) 80. A method, apparatus, or system described in the present disclosure.

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