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65 results about "Average bitrate" patented technology
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Average bitrate (ABR) refers to the average amount of data transferred per unit of time, usually measured per second, commonly for digital music or video. An MP3 file, for example, that has an average bit rate of 128 kbit/s transfers, on average, 128,000 bits every second. It can have higher bitrate and lower bitrate parts, and the average bitrate for a certain timeframe is obtained by dividing the number of bits used during the timeframe by the number of seconds in the timeframe. Bitrate is not reliable as a standalone measure of audio/video quality, since more efficient compression methods use lower bitrates to encode material at a similar quality.
Multi-pass variable bitrate media encoding
InactiveUS20050015246A1Enhance listening experienceQuality improvementSpeech analysisFile sizeComputer science
An encoder uses multi-pass VBR control strategies to provide constant or relatively constant quality for VBR output while guaranteeing (within tolerance) either compressed file size or, equivalently, overall average bitrate. The control strategies include various techniques and tools, which can be used in combination or independently. For example, in a first pass, an audio encoder encodes a sequence of audio data partitioned into variable-size chunks. In a second pass, the encoder encodes the sequence according to control parameters to produce output of relatively constant quality. The encoder sets checkpoints in the second pass to adjust the control parameters and / or subsequent checkpoints. The encoder selectively considers a peak bitrate constraint to limit peak bitrate. The encoder stores auxiliary information from the first pass for use in the second pass, which increases the speed of the second pass. Finally, the encoder compares signatures for the input data to check consistency between passes.
Owner:MICROSOFT TECH LICENSING LLC
Method and apparatus for playing-back moving image data
InactiveUS20050147383A1Improve search accuracyQuick and accurate searchingTelevision system detailsDisc-shaped record carriersTime informationGroup of pictures
The invention is directed to the provision of a moving image data playback method, and more particularly, an MPEG data playback method that can randomly access MPEG data stored at a VBR. The playback method comprises: storing in a table an average bit rate computed from time information at the beginning and end of stored moving image data; detecting and storing the time information and position information of randomly accessible picture groups one at the beginning of the moving image data and the other at the end thereof, and computing a picture group unit time from the number of frames between adjacent picture groups and storing the result in the table; computing a point to be accessed, based on the average bit rate and other information stored in the table; and starting playback from the computed point to be accessed, and storing in the table the time information and position information of the picture groups detected during the playback and the average bit rate between each picture group computed from the detected time information and position information.
Owner:FUJITSU LTD
Multi-rate coding
InactiveUS20050055203A1Efficient codingEasy to useSpeech analysisCommunications systemComputer science
According to an embodiment of the invention there is provided a method for multi-rate encoding in a communication system. The method comprises the step of providing a codec with sets of tuning parameters for use in selection of codec modes. Each set of tuning parameters provides an average bit rate. A bit rate target is received for encoding a signal by the codec, the bit rate target having any value between the minimum and maximum average bit rate of the codec. An encoding mode is then selected based on the bit rate target and the sets of tuning parameters, and the signal is encoded by means of the selected encoding mode. A multi-rate codec comprising a selector for selecting an encoding mode from a set of encoding modes based on a bit rate target is also provided.
Owner:NOKIA CORP
Single pass variable bit rate control strategy and encoder for processing a video frame of a sequence of video frames
InactiveUS20060062292A1Easy to compressQuality improvementColor television with pulse code modulationColor television with bandwidth reductionPattern recognitionVariable bit rate vbr
An encode control strategy is provided for variable bit rate encoding of a sequence of video frames in a single pass. The control strategy includes determining whether a video frame has a complexity level statistically outside a defined range from a complexity level of at least one preceding frame of the sequence of video frames, and if so, determining a new average bit rate target for the video frame. The new average bit rate for the video frame is determined employing at least one of spatial complexity and temporal complexity of the video frame. The new average bit rate target for the video frame is used to set frame level bit rate control parameter(s), and the video frame is encoded using the set frame level bit rate control parameter(s).
Owner:GLOBALFOUNDRIES INC
Rate selection method for selectable mode vocoder
InactiveUS7054809B1Reduce bandwidth requirementsQuality improvementSpeech analysisHalf RateFull Rate
There is provided rate selection methods and systems for selecting coding rates for coding frames of a speech signal to realize an average bit rate indicated by a mode. For example, a mode 0, mode 1, and a mode 2 may be defined, with each mode requiring a different average bit rate. To achieve the average bit rate of a particular mode, a coding rate is selected for each frame of the speech signal, based on the characteristics of a frame. A frame can be categorized in a class, such as noise or silence, noise-like unvoiced speech, pulse-like unvoiced speech, transition into voiced speech, unstable voiced speech, stable voiced speech. Other parameters may also be used, such as the sharpness, noise-to-signal ratio, pitch correlation, energy, and reflection coefficient. A frame may then be coded at a full-rate, a half-rate, a quarter-rate, or an eighth-rate.
Owner:DIGIMEDIA TECH LLC
System and method for transrating based on multimedia program type
ActiveUS20070073904A1Digital data processing detailsData switching by path configurationPeak valueBit rate
A multimedia program type of a received multimedia data is determined. Based on the determined multimedia program type, a peak bit rate limit and / or an average bit rate limit are determined. In instances where a transrated version of the multimedia data is to be stored, a remaining storage capacity of a storage device is determined and the peak bit rate limit and / or the average bit rate limit can be adjusted based on the remaining storage capacity. The multimedia data then is transrated to generate transrated multimedia data that has a peak bit rate that does not exceed the selected peak bit rate limit and / or having an average bit rate that does not exceed the selected average bit rate limit. The transrating of the multimedia additionally can include the application of rule sets based on content characteristics. After transrating, the multimedia data can be transmitted via a network to a destination multimedia device, stored locally for subsequent use, or a combination thereof.
Owner:PIXELWORKS
Bit rate control method and system based on VBR video encoding
ActiveCN104159109AInternal Timing SmoothingGood for smooth playbackDigital video signal modificationFrame basedVideo encoding
The invention is applicable to the field of streaming media technology, provides a bit rate control method and system based on VBR video encoding. The method comprises the steps of recording encoding information for each previously encoded frame; initializing encoding parameters of a current frame according to the encoding information and an average bit rate of video encoding; setting a maximum bit rate for the current frame based on a distortion optimization algorithm; encoding the current frame in a multi-path manner based on the encoding parameters and the maximum bit rate; estimating an encoding bit rate generated by a current path encoding of the current frame, and determining whether the encoding bit rate exceeds the maximum bit rate; and if so, conducting a next path encoding after the encoding parameters is adjusted until the encoding bit rate of the current frame does not exceed the maximum bit rate. In this way, requirements in terms of bit rate control and video quality can be effectively balanced, control of the maximum bit rate can allow an internal timing sequence of a player to be smoother, and smooth playing of a video program is facilitated.
Owner:百视通网络电视技术发展有限责任公司
A wireless DASH streaming media code rate smoothing adaptive transmission method
ActiveCN109040855AImprove quality of experienceHigh average bit rateSelective content distributionShort termsSwitching time
The invention relates to the technical field of adaptive streaming media code rate, in particular to a wireless DASH streaming media code rate smoothing adaptive transmission method, comprising the steps of counting download rate data of N slices before, predicting bandwidth trend and bandwidth value of a wireless network; according to the predicted bandwidth trend, bandwidth value and buffer occupancy, the slice scheduling model adaptively selecting the optimal bit rate. The method of the invention considers a plurality of parameters, accurately judges the change trend of the bandwidth of thewireless network, and at the same time, smoothes the short-term fluctuation of the bandwidth. The method of the invention provides a higher average code rate in the video playing process while maintaining less code rate switching times, and provides a good video experience quality of the wireless terminal for the viewer.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Transmission of video
ActiveUS7760801B2Color television with pulse code modulationPulse modulation television signal transmissionData streamVideo transmission
Compressed recorded video is to be transmitted over a variable bit-rate link, using bandwidth reservation. In order to determining the transmission rate that is to be used (and reserved) at any given time, in such a way as to make the two match so as to minimize wasted bandwidth, the data stream is split into chunks chosen such that the average bit rate for the chunk as a whole is no less that the average bit rate for any shorter chunk starting at the same point. The chunk can then be transmitted using this average rate without any buffering problems. Preferably one chooses chunks so that the average bit rate for the chunk is no less than that for any shorter or longer chunk starting at the same point. This has the benefit that a request for bandwidth never has to ask for an allocation that is higher than that specified in any previous such request. In systems that switch between streams of different degrees compression. the switching points can with advantage be chosen to coincide with the inter-chunk boundaries.
Owner:BRITISH TELECOMM PLC
System for improved use of pitch enhancement with subcodebooks
ActiveUS7117146B2Easy to useCapture redundancySpeech analysisFluid pressure measurement by acoustic meansTyping ClassificationHalf Rate
A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired average bit rate with the perceptual quality of the reconstructed speech. The speech compression system comprises a full-rate codec, a half-rate codec, a quarter-rate codec and an eighth-rate codec. The codecs are selectively activated based on a rate selection. In addition, the full and half-rate codec are selectively activated based on a type classification. Each codec is selectively activated to encode and decode the speech signals at different bit rates emphasizing different aspects of the speech signal to enhance overall quality of the synthesized speech. The overall quality of the system is strongly related to the excitation. In order to enhance the excitation, the system contains a fixed codebook comprising several subcodebooks. The invention reveals a way to apply a pitch enhancement efficiently and differently for different subcodebooks without using additional bits. The technique is particularly applicable to selectable mode vocoder (SMV) systems.
Owner:SAMSUNG ELECTRONICS CO LTD
TCP/UDP (Transmission Control Protocol and User Datagram Protocol) mixed protocol based streaming media wireless self-adaptive transmission method
ActiveCN104618337AReliable transmissionReduce transmissionError prevention/detection by using return channelReliable transmissionCycle threshold
The invention discloses a TCP / UDP (Transmission Control Protocol and User Datagram Protocol) mixed protocol based streaming media wireless self-adaptive transmission method. The reliable transmission of a TCP is combined with the small transmission overhead, the high speed and the high efficiency of the UDP, the encapsulation is performed on video and audio data through a fixed length of data packet header, and the hierarchical transmission is performed through different channels according to different data frame types. A receiver is provided with a data packet life cycle threshold vale and a feedback information packet is sent to a sender if the timeout of the data receiving is produced. The sender starts to discard non-critical frame data of the unreliable transmission channels and accordingly the channel congestion is alleviated, the audio and video delay is reduced, and the real-time performance of the streaming media playing is ensured. In addition, the dynamic adjustment on the coding rate of the sender is implemented by an average code rate weighed control algorithm according to the channel transmission data received by the receiver and accordingly the good self-adaption to the changes of the wireless channel bandwidth can be achieved.
Owner:ZHEJIANG SCI-TECH UNIV
Audio playback time estimating apparatus and method
InactiveUS20080172140A1Effective estimateRandom number generatorsRecord information storageID3Computer science
Owner:SAMSUNG ELECTRONICS CO LTD
Low-delay audio coder
ActiveUS20110224975A1Increase bitrateRemove bit rateColor television with pulse code modulationColor television with bandwidth reductionWeight coefficientModel parameters
The present invention relates to methods and devices for encoding and decoding digital audio signals, e.g. a speech signal. An audio coder and a decoder are provided wherein a modeller adds a first distribution model obtained from model parameters of past segments of the digital audio signal and a fixed distribution model, each of the models being multiplied by a weighting coefficient, for obtaining a combined distribution model. The weighting coefficients are selected to minimize a code length of a current segment of the digital audio signal. As the combined distribution model is a sum of several distribution models, wherein at least some of the models is based on the model parameters, flexibility is introduced in the signal model used to encode the digital audio signal. Thus, an audio coder and decoder providing a low bit rate in average, low bit rate variations and low error propagation are provided.
Owner:GOOGLE LLC
QoE-driven adaptive scheduling method of multichannel HAS code rate
ActiveCN106375790AImprove fairnessImprove experienceSelective content distributionSelf adaptiveQuality of experience
The invention relates to a QoE (Quality of Experience, quality of experience, user experience)-driven adaptive scheduling method of multichannel HAS (HTTP Adaptive Streaming, HTTP adaptive streaming media) code rate. The method comprises the following steps: establishing a QoE model of multichannel HAS by three factors of video content type, code rate and Kartun; calculating a message parameter value of each channel by a server, comprising an average code rate, an average code rate level, a resource competition intense degree in the channel, and transmitting the message parameter value of each channel to each user; and formulating a QoE-driven adaptive multichannel HAS code rate algorithm according to the received message parameter values of the channels and the QoE model of multichannel HAS, and calculating the code rate level of a next video slicing request of each user.
Owner:XI AN JIAOTONG UNIV
Variable rate speech coding
InactiveUS20070179783A1Reduce bitrateLarge capacitySpeech analysisCode conversionTime changesRandom noise
A method and apparatus for the variable rate coding of a speech signal. An input speech signal is classified and an appropriate coding mode is selected based on this classification. For each classification, the coding mode that achieves the lowest bit rate with an acceptable quality of speech reproduction is selected. Low average bit rates are achieved by only employing high fidelity modes (i.e., high bit rate, broadly applicable to different types of speech) during portions of the speech where this fidelity is required for acceptable output. Lower bit rate modes are used during portions of speech where these modes produce acceptable output. Input speech signal is classified into active and inactive regions. Active regions are further classified into voiced, unvoiced, and transient regions. Various coding modes are applied to active speech, depending upon the required level of fidelity. Coding modes may be utilized according to the strengths and weaknesses of each particular mode. The apparatus dynamically switches between these modes as the properties of the speech signal vary with time. And where appropriate, regions of speech are modeled as pseudo-random noise, resulting in a significantly lower bit rate. This coding is used in a dynamic fashion whenever unvoiced speech or background noise is detected.
Owner:QUALCOMM INC
Video streaming
ActiveUS20100128604A1Error preventionFrequency-division multiplex detailsBandwidth constraint3d streaming
The bitrate for any practical video streaming system will vary considerably as a function of the difficulty of encoding the sequence in question. This variation is even more apparent when comparing different video clips of different genres for example where sports clips might require a higher average bitrate and fluctuate more due to the high activity of typical scenes, whereas a news report clip might require a much lower bitrate and be relatively static. As such, to deliver video streams at a constant quality to users sharing a contended network, a constant bandwidth method is not efficient to use across all the streams. The bandwidth allocated to each stream must be allowed to dynamically vary in time in accordance with the precise demands of the video being streamed at that time and also be within any network bandwidth constraints. The present invention defines such a method.
Owner:BRITISH TELECOMM PLC
Detection method for elephant flow, equipment and system
Embodiments of the invention provide a detection method for elephant flow, equipment and a system, relate to the technical field of communication and solve a problem that the elephant flow is detected through upgrading a forwarding chip of a switch and storing a flow table to cause high equipment cost in the existing technology. The specific scheme is as follows: a controller receives an SYN message of data flow sent by at least one switch and records parameter information of the data flow, wherein the parameter information includes receiving time of the SYN message, a serial number, a source IP address, a destination IP address, a source port and a destination port which are carried in the SYN message, and a transmission path of the data flow; if an FIN message of the data flow is not received in a preset time threshold, the controller issues a flow strategy to any switch on the data flow transmission path, receives one data message, records the serial number carried by the receiving time of the data message and computes a first average bitrate; and the controller determines the data flow as the elephant flow according to the first average bitrate. The embodiments of the invention are used for detecting the elephant flow.
Owner:HUAWEI TECH CO LTD
State machine based dynamic adaptive video transmission code rate switching method
ActiveCN108063955AFewer code rate switching timesHigh bit rateSelective content distributionMean squareVideo quality
The invention belongs to the field of multi-media communication, and in particular relates to a state machine based dynamic adaptive video transmission code rate switching method. The state machine based dynamic adaptive video transmission code rate switching method comprises the steps that: a server side slices a stored video; each video clip has K code rate grades; a client side calculates the average code rate, the mean square deviation and the average bandwidth of N video clips according to the newly downloaded N video clips; the code rate offset rate and the playing cache of the client side when downloading of the kth video clip is completed are obtained; and, due to different ranges of the playing cache and different ranges of the code rate offset rate, code rate switching is carriedout according to a code rate state switching formula. According to the state machine based dynamic adaptive video transmission code rate switching method disclosed by the invention, the contact between the video code rate and the numerical value change of an influence factor is used as a state transition condition; on the premise that the playing cache and the code rate offset rate are a certainthreshold value, the code rate is switched to the code rate grade that the whole performances of the video quality and the playing fluency are relatively best; and thus, better user viewing experienceis realized.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Code rate control method and code rate control device
ActiveCN108235016AImprove image qualityReasonable storage spaceDigital video signal modificationComputer hardwarePeriod length
The embodiment of the invention provides a code rate control method and a code rate control device, wherein the code rate control method comprises the following steps: acquiring and determining a frame level coding parameter according to a code rate control mode and a coding control parameter of a current short period in a long period, and sending the frame level coding parameter to a coder; acquiring second code stream information; according to the second code stream information, performing statistics for statistic information comprising complexity information of a current video frame, totalcoding bits of the current short period and coding quality information; when the long period is not ended, if the current short period is ended, acquiring and determining average code rate of neighboring next short period of the current short period in the long period according to the period length of the current short period, preset code rate control parameters and the statistic information, andthereby coding the video frame of the next short period through calculating the frame level coding parameter of the neighboring next short period. Through the method and device provided by the schemeof the invention, storage space can be allocated rationally under a condition that images are guaranteed to satisfy certain quality.
Owner:HANGZHOU HIKVISION DIGITAL TECH
Bit-rate asymptotic switching method and system for dynamic adaptive HTTP (Hyper Text Transfer Protocol) stream
InactiveCN109379632AReduce stutteringLess stutteringTransmissionSelective content distributionBroadbandVideo quality
The invention discloses a bit-rate asymptotic switching method and system for a dynamic adaptive HTTP (Hyper Text Transfer Protocol) stream. The method comprises broadband estimation and bit-rate switching. According to the bit-rate asymptotic switching method for the dynamic adaptive HTTP stream, a network bandwidth is estimated more strictly, and a bit rate is selected more reasonably, so that an unsmooth playing phenomenon in a video playing process rarely exists; meanwhile, the bandwidth is used to the greatest extent, so that an average bit rate of a video is relatively high, and the video quality is optimized; a bit-rate switching strategy is more comprehensive, which enables the number of times of bit-rate switching to be as small as possible; furthermore, in case of switching, theswitching action is also controlled to be performed stage by stage as far as possible; the whole bit-rate adaptive process is higher in stability and smoothness; and therefore, a high-quality experience requirement of a user in a film watching process is guaranteed.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Distortion-based method and apparatus for buffer control in a communication system
ActiveUS7062429B2Reduces local variationConsistent perceptual qualityColor television with pulse code modulationColor television with bandwidth reductionBit allocationControl communications
A method and apparatus are disclosed for controlling a buffer in a communication system, such as a digital audio broadcasting (DAB) communication system. A more consistent perceptual quality over time provides for a more pleasing auditory experience to a listener. Thus, the disclosed bit allocation process determines, for each frame, a distortion d[k] at which the frame is to be encoded. Generally, the distortion d[k] is determined to minimize (i) the probability for a buffer overflow, and (ii) the variation of perceived distortion over time. A buffer level is controlled by partitioning a signal into a sequence of successive frames; estimating a distortion rate for a number of frames; and selecting a distortion such that the variance of the buffer level is bounded by a specified value. In one implementation, a signal is coded by partitioning the signal into a sequence of successive frames; encoding each frame k for each of a plurality of distortions Di to compute a frame bitrate; estimating an average bitrate Ri[k] for each of said plurality of distortions Di given current and past frame bitrates; interpolating between each of said pair of values for said average bitrate Ri[k] and said plurality of distortions Di to obtain an approximation of a function that maps a distortion to an estimated average bitrate; and encoding each frame with a distortion level determined from said function.
Owner:AVAGO TECH INT SALES PTE LTD
Multipath video adapting coding transmission method under limited bandwidth and transmission system thereof
InactiveCN102427532AImprove experienceQuality assuranceClosed circuit television systemsSelective content distributionCode moduleVideo transmission
The invention provides a multipath video adapting coding transmission method under limited bandwidth. The method comprises the following steps that: (1) a control module of a server terminal adjusts an average code rate of each path video code stream according to an adjusting strategy; (2) a coding module of a server terminal codes an original video signal and outputs the coding bit flow with different qualities according to an average code rate requirement; (3) a sending module of the server terminal sends the code stream output from the coding module; (4) a reception module of a client pre-buffers and receives the video code stream; (5) a decoding display unit of the client reorders the disordered video code stream in received video code stream decoding and sends code stream time delay or deletion to the server terminal; (6) a process returns to a step (1) and a cyclic operation is performed. By using the method and the system of the invention, video transmission with a high qualityand a large user number can be completed under a stable and limited bandwidth network state. An ideal user usage experience can be provided under a condition of the crowd users and video transmissionquality can be guaranteed.
Owner:CHENGDU GUODIAN INTELLIGENT ELECTRIC POWER TECH
Dynamic flow control method of streaming media server for ensuring audio/video quality
ActiveCN102186119AReduce shockAvoid packet lossSelective content distributionTraffic capacityPacket loss
The invention provides a dynamic flow control method of a streaming media server for ensuring audio / video quality, which comprises the following steps of: (1), dividing a sending stream document into a group of slices and establishing index information for the slices before the sending stream document is played; (2), figuring out an average code rate according to the index information, and recording or setting a group boundary, wherein all frames in a frame group are sent with reference to the average code rate; (3), sending a transport stream packet, and recording to the length of the maximum packet, and obtaining the time interval of the maximum packet by dividing the length of the maximum packet by the average code rate; (4) initially playing one packet, determining a relative time forthe next packet to be sent according to the time interval of the maximum packet, calculating an absolute time point for the next packet to be sent, and judging whether the current time exceeds the relative time; (5), reaching the end of a frame to complete the sending of one packet; and (6) recalculating the average code rate and entering the next circulation when a played frame reaches the groupboundary. When the method is adopted, the problem of packet loss can be solved, the impact on a router can be reduced, the play speed and play effect can be ensured, and the play quality can be improved.
Owner:FENGHUO COMM SCI & TECH CO LTD
Method and device for adaptive discontinuous voice transmission
ActiveCN102903364AOvercome the disadvantage of high computational complexityEasy to trackSpeech analysisComputation complexityFrequency spectrum
The invention discloses a method and a device for adaptive discontinuous voice transmission. The method includes: during adaptive discontinuous voice transmission, determining whether to transmit a silence insertion descriptor or not according to a current voice signal frame and spectral information of a previous silence insertion descriptor. By the method and device, the problems that flexibly monitoring signal change by means of fixed intervals fails in the prior art and necessity of computation on multiple parameters such as linear prediction for the use of the means of variable intervals causes high computation complexity can be solved. Transmission is directly performed frequency domains by the method and device, signal change can be well tracked, and acoustic fidelity is guaranteed while low average bitrate is kept.
Owner:ZTE CORP
Video transcoding method and device
ActiveCN107659819AImprove transcoding performanceConsistent code rateDigital video signal modificationSelective content distributionNetwork packetTranscoding
The invention discloses a video transcoding method and device, and belongs to the technical field of the computer. The method comprises the following steps: acquiring a video data packet of a de-encapsulated target video; periodically computing the overall average code rate of the target video and the local average code rate in the preset period; adjusting the coding rate according to the overallaverage code rate and the local average code rate; and performing transcoding processing on the target video based on the adjusted coding rate. By using the method and device disclosed by the invention, the basic consistency of the code rate of the output video and the code rate of the input video can be furthest guaranteed, and the video transcoding effect can be improved.
Owner:CHINANETCENT TECH
Image processing apparatus and computer-readable storage medium
InactiveUS20060215750A1Reduce bitrateIncrease bitratePicture reproducers using cathode ray tubesPicture reproducers with optical-mechanical scanningComputer hardwareImaging processing
Provided are an image processing apparatus and a computer-readable storage medium capable of adjusting to an optimum bit rate. In a case where an average bit rate is smaller than a target bit rate, a mobile communication terminal sets an encoding parameter for high image quality in an internal register of an encoding parameter manager to increase the bit rate. In a case where the average bit rate is larger than the target bit rate, the mobile communication terminal sets an encoding parameter for low image quality in the internal register of the encoding parameter manager to reduce the bit rate. Therefore, the mobile communication terminal can encode YUV data at an optimum bit rate.
Owner:LENOVO INNOVATIONS LTD HONG KONG
Video frame encoding method and terminal
ActiveCN109413427AGuaranteed coding qualitySmooth transmissionDigital video signal modificationConversion involving interpolation processesPattern recognitionBit numbering
Owner:TENCENT TECH (SHENZHEN) CO LTD
Video streaming
ActiveUS8125901B2Error preventionFrequency-division multiplex detailsBandwidth constraintHigh activity
The bitrate for any practical video streaming system will vary considerably as a function of the difficulty of encoding the sequence in question. This variation is even more apparent when comparing different video clips of different genres for example where sports clips might require a higher average bitrate and fluctuate more due to the high activity of typical scenes, whereas a news report clip might require a much lower bitrate and be relatively static. As such, to deliver video streams at a constant quality to users sharing a contended network, a constant bandwidth method is not efficient to use across all the streams. The bandwidth allocated to each stream must be allowed to dynamically vary in time in accordance with the precise demands of the video being streamed at that time and also be within any network bandwidth constraints. The present invention defines such a method.
Owner:BRITISH TELECOMM PLC
A method and system for rate adaptive switch
ActiveCN108989880AGood average bit rateGood interrupt characteristicsSelective content distributionData switching networksSelf adaptiveFeature selection
The embodiment of the invention provides a code rate adaptive switching method, which comprises the following steps: identifying a current network state; if the identification result of the current network state is a first state, adopting a first rate switching strategy; if the identification result of the current network state is a second state, adopting a second rate switching strategy; whereinthe first rate handoff strategy is to select an appropriate rate according to an average throughput size of the network, and the second rate handoff strategy is to select an appropriate rate accordingto an instantaneous throughput size of the network. The code rate adaptive switching method provided by the embodiment of the invention is applicable to the transmission scene of the DASH video service in the mobile network by identifying the network state and selecting the corresponding code rate switching strategy according to the characteristics of the network state, and has good performance in the aspects of average code rate, interruption characteristic and the like.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Single pass variable bit rate control strategy and encoder for processing a video frame of a sequence of video frames
InactiveUS20080225943A1Easy to compressQuality improvementColor television with pulse code modulationColor television with bandwidth reductionComputer hardwareFrame sequence
An encode control strategy is provided for variable bit rate encoding of a sequence of video frames in a single pass. The control strategy includes determining whether a video frame has a complexity level statistically outside a defined range from a complexity level of at least one preceding frame of the sequence of video frames, and if so, determining a new average bit rate target for the video frame. The new average bit rate for the video frame is determined employing at least one of spatial complexity and temporal complexity of the video frame. The new average bit rate target for the video frame is used to set frame level bit rate control parameter(s), and the video frame is encoded using the set frame level bit rate control parameter(s).
Owner:GLOBALFOUNDRIES INC
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