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Syntax and Semantics of Buffer Information to Simplify Video Stitching

A video and buffer technology, applied in the direction of digital video signal modification, television, image communication, etc., can solve the problems of inability to guarantee the compatibility of splicing streams, cumbersome operations, and difficulty in carrying out

Active Publication Date: 2019-07-02
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing approaches to signal CPBRD values ​​in order to adjust CPBRD values ​​to account for splicing can be cumbersome and potentially difficult to perform during splicing
Another issue is that while two source streams may be individually compatible with HRD, after splicing, there is no guarantee that the resulting spliced ​​stream will be compatible with HRD

Method used

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  • Syntax and Semantics of Buffer Information to Simplify Video Stitching
  • Syntax and Semantics of Buffer Information to Simplify Video Stitching
  • Syntax and Semantics of Buffer Information to Simplify Video Stitching

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Embodiment Construction

[0029] DETAILED DESCRIPTION Various approaches are proposed to improve the support of stitching operations by adjusting the syntax and / or semantics of Coded Picture Buffer Clear Delay (CPBRD) values. In many cases, these approaches reduce the disadvantages of existing approaches. In particular, the detailed description proposes innovations in the syntax and semantics of CPBRD values ​​notified with various types of HEVC standards or Supplemental Enhancement Information (SEI) messages of the H.264 / AVC standard. In various examples, the syntax and / or expectations of buffering period SEI ("BP SEI") messages and / or picture timing SEI ("PT SEI") messages are adjusted for stitching operations.

[0030] Although the operations described herein are described in some places as being performed by an encoder (e.g., a video encoder), a decoder (e.g., a video decoder), or a stitching tool (e.g., a video stitching tool), in many cases, This operation may alternatively be performed by anoth...

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Abstract

Innovations in the syntax and semantics of encoding Picture Buffer Clear Delay ("CPBRD") values ​​could potentially simplify stitching operations. For example, the video encoder sets the CPBRD value of the current picture indicating the delta value relative to the nominal coded picture buffer clear time of the previous picture in decoding order, whether or not the previous picture had a Buffering Period SEI message. The encoder can be based on a single value method where a flag indicates how to interpret a CPBRD value, according to a two value method where another CPBRD value (with a different interpretation) is also signaled using, or according to a two value method using a flag and a delta value, to signal the CPBRD value. The corresponding video decoder receives and parses the CPBRD value for the current picture. Stitching tools can use the CPBRD value for the current picture to do a simple concatenation operation to splice the bitstream.

Description

technical field [0001] Embodiments of the present disclosure relate to video stitching operations. Background technique [0002] Engineers employ compression (also known as source encoding) to reduce the bit rate of digital video. Compression reduces the cost of storing and transmitting video information by converting the information into a lower bit rate form. Decompression (also known as decoding) is the reconstruction of the original version of information from compressed form. A "codec" is an encoder / decoder system. [0003] Over the past two decades, various video codec standards have been adopted, including ITU-T H.261, H.262 (MPEG-2 or ISO / IEC 13818-2), H.263 and H.264 (MPEG- 4AVC or ISO / IEC 14496-10) standard and MPEG-1 (ISO / IEC 11172-2), MPEG-4 video (ISO / IEC 14496-2) and SMPTE 421M (VC-1) standard. Recently, the HEVC standard (ITU-T H.265 or ISO / IEC 23008-2) has been developed. Video codec standards generally define syntax options for encoded video bitstreams,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/46H04N19/70H04N21/234H04N21/44
CPCH04N21/23424H04N21/44016H04N19/70H04N7/147H04N7/15H04N7/18H04N19/573H04N19/58H04N19/46
Inventor G.J.苏利万朱立华
Owner MICROSOFT TECH LICENSING LLC