CN101710997A - MPEG-2 (Moving Picture Experts Group-2) system based method and system for realizing video and audio synchronization - Google Patents

MPEG-2 (Moving Picture Experts Group-2) system based method and system for realizing video and audio synchronization Download PDF

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CN101710997A
CN101710997A CN 200910110051 CN200910110051A CN101710997A CN 101710997 A CN101710997 A CN 101710997A CN 200910110051 CN200910110051 CN 200910110051 CN 200910110051 A CN200910110051 A CN 200910110051A CN 101710997 A CN101710997 A CN 101710997A
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pts
stc
system clock
local system
audio
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刘成刚
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ZTE Corp
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Abstract

The invention discloses MPEG-2 system based method and system for realizing video and audio synchronization. The method comprises the following steps of: setting a local system clock (STC), wherein the local system clock (STC) adopts a local reference clock as a reference clock and adopts an audio playing time stamp (PTS) corresponding to the current audio signal as a calibrating clock; comparing a video playing time stamp (PTS) corresponding to the current video signal with the local system clock (STC) and processing the current video signal according to a compared result. The technical scheme recovers the local system clock (STC) by adopting the local reference clock as the reference clock and adopting the audio playing time stamp (PTS) as the calibrating clock, adjusts the playing condition of the video signal by the local system clock (STC), realizes the synchronous playing of video and audio and prevents the synchronous jumping or replaying condition of the video and audio signal caused by the joggling of a program reference clock (PCR).

Description

Based on the MPEG-2 system realize looking, the method and system of audio sync
Technical field
The present invention relates to multimedia technology field, relate in particular to a kind of based on MPEG-2 ((MovingPicture Experts Group: dynamic image expert group) system realize looking, the method and system of audio sync.
Background technology
IPTV (Internet Protocol Television: IPTV) system generally adopt the MPEG-2 system to look, audio frequency media information transmits, as shown in Figure 1, the IPTV system utilizes the infrastructure of broadband network usually, will from the data of program source the program processing unit gather and coding after, carry out the content distribution through the content distribution module, transmit in metropolitan area network or Access Network by Internet agreement (IP) again, arrive user terminal at last and play; Treated program also can (Electronic Program Guide: electric program menu) administration module and EPG server carry out the management of program guide by EPG.Carry out data in looking in the existing IPTV system, the audio frequency media The data MPEG-2 system layer when transmitting, the system layer coding generally has two kinds of methods: transport stream (TS:Transport Stream) and program flow (PES:Paketized Elementary Stream, or be called the packing program flow), be applicable to different application respectively.The data transfer mode of system layer has realized the multiplexed substantially of single Voice ﹠ Video original data stream in the existing as shown in Figure 2 MPEG-2 system, video data or voice data enter video encoder or audio coder respectively encode after, carry out packet by packing device, and forming corresponding audio PES and video PES respectively, the two imports program stream simultaneously and transport stream is exported.
The data transfer mode of existing described MPEG-2 system layer has realized volume by time model figure shown in Figure 3, that decodes is synchronous, its concrete mode is: vision signal and audio signal arrive encoder through over-sampling (A/D conversion) and encode, pass through encoding buffer again, system coding and multiplexer, storage and transmission, system's demultiplexing and multi-channel decoder device, after a plurality of links such as decoding buffer zone and decoder, can produce with certain delay, therefore MPEG-2 has defined system clock STC (its frequency is 27MHz) in decoding end, the work clock of encoder recovers this system clock STC through after the constant delay in decoding end, is used for realizing looking, the synchronous volume of audio frequency, decoding and broadcast.
At the PES layer, the PES header can be provided with Presentation Time Stamp PTS, and (the indication audio frequency and video show the time tag of time, represent the predetermined demonstration time of first addressed location in System Target Decoder in this grouping) and the Decoding Time Stamp DTS (time tag of indication audio/video decoding time, represent the predetermined decoding time of first addressed location in System Target Decoder in this grouping), the frequency of the two all is 90KHz; In the TS layer, it is the Program Clock Reference PCR (time tag of the instantaneous value of indication mechanism clock own) of 27MHz that the TS header has comprised frequency, in the prior art, decoding end adopts Program Clock Reference PCR to recover the system clock STC consistent with coding side, and adopt this system clock STC to look, audio signal is decoded and play.Be illustrated in figure 4 as the schematic diagram that prior art adopts phase-locked loop recovery system clock STC, be that video or audio signal are through after encoding, behind the transmission stream decoding with the reference clock of Program Clock Reference PCR as phase-locked loop, the flow chart that system clock STC is recovered comprises the steps: at first to extract Program Clock Reference PCR from transport stream as shown in Figure 5, then it is judged, if being the top line reference clock PCR of program, this Program Clock Reference PCR directly it is directly inserted STC, otherwise PCR and STC are compared, make difference e change into the instantaneous frequency that voltage signal f controls voltage controlled oscillator (VCO) through low pass filter, voltage controlled oscillator output frequency again is the system clock STC of the oscillator signal of 27MHz as decoder.
The flow chart that system clock STC realization is looked, audio sync is play that Fig. 6 recovers for adopting Fig. 4, may further comprise the steps: the PTS/DTS that reads current audio frame or frame of video correspondence, PTS/DTS and the STC that through frequency behind 300 frequency divisions is 90KHz are compared, if current PTS/DTS is greater than STC, show that play this moment or decoding is very fast, need the playback present frame or slow down decoding; If the difference of STC and PTS/DTS greater than 1/2 frame, shows play this moment or decode slowly, need skip present frame or accelerate and decode; Time-delay can be accepted if the difference of STC and PTS/DTS, shows this moment less than 1/2 frame, so normal play or decoding.
This shows, the decoding of prior art sound intermediate frequency and video and broadcast are all carried out synchronously based on Program Clock Reference PCR, therefore, when shake appearred in Program Clock Reference PCR, audio signal and vision signal may produce simultaneously jumped or the situation of playback frame, caused looking, voice playing is discontinuous, playback quality is caused certain influence, especially people's hearing sensitivity is very high, and audio frequency slightly intermittently just is easy to be discovered, and has therefore reduced user experience quality.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of avoid video and audio signal to jump simultaneously or reset, make video and audio sync is play based on the MPEG-2 system realize looking, the method and system of audio sync.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of based on the MPEG-2 system realize looking, the method for audio sync, may further comprise the steps: local system clock STC is set, described local system clock STC as reference clock, and adopts current audio signals corresponding audio reproduction time label PTS as the calibration clock with local reference clock; Video playback time tag PTS and described local system clock STC to current video signal correspondence compare, and handle the current video signal according to comparative result.
A kind of local system clock STC with local reference clock as the concrete grammar of reference clock is: local crystal oscillator signal is carried out accumulated counts produce local reference clock, with the reference clock of described local reference clock as described local system clock STC.
In a kind of execution mode, the frequency of described local crystal oscillator signal is 27MHz; The concrete grammar that the video playback time tag PTS and the described local system clock STC of current video signal correspondence compared is: after described local system clock STC was carried out 300 frequency divisions, the video playback time tag PTS corresponding with the current video signal compared.
A kind of current audio signals corresponding audio reproduction time label PTS that adopts as the concrete grammar of calibration clock is: after obtaining current audio frame corresponding audio reproduction time label PTS from transport stream, judge whether first voice playing time tag PTS for program, be then described voice playing time tag PTS to be changed to described local system clock STC, otherwise use described voice playing time tag PTS that described local system clock STC is calibrated.
The concrete grammar of handling the current video signal according to comparative result is: default acceptable time threshold values S; If the video playback time tag PTS of current video frame correspondence is greater than described local system clock STC, the current video frame of then resetting; If the difference of the video playback time tag PTS that described local system clock STC is corresponding with current video frame is less than or equal to described time threshold values S, then show current video frame immediately; If the difference of the video playback time tag PTS that described local system clock STC is corresponding with current video frame is then skipped current video frame greater than described time threshold values S.
Described time threshold values S is for playing 1/2 frame of video time corresponding.
A kind of based on the MPEG-2 system realize looking, the system of audio sync, comprise STC module, audio frequency PTS output module, video PTS output module, decision device and video playback module; Audio frequency PTS output module is used to export current audio signals corresponding audio reproduction time label PTS to described STC module; The STC module is used to be provided with local system clock STC, described local system clock STC with local reference clock as reference clock, and adopt described current audio signals corresponding audio reproduction time label PTS as the calibration clock; Also be used for described local system clock STC is imported described decision device; Video PTS output module is used to export the video playback time tag PTS of current video signal correspondence to described decision device; Decision device is used for the video playback time tag PTS of described current video signal correspondence and described local system clock STC are compared, and the output comparative result is to the video playback module; The video playback module is used for according to described comparative result the current video signal being handled.
In a kind of execution mode, system also comprises local crystal oscillator, and described STC module is a stc counter; Local crystal oscillator is used to export local crystal oscillator signal to the STC module; Stc counter is used for described local crystal oscillator signal is carried out accumulated counts and produces local reference clock.
After described STC module is used for obtaining current audio frame corresponding audio reproduction time label PTS from transport stream, judge whether first voice playing time tag PTS for program, be then described voice playing time tag PTS to be changed to described local system clock STC, otherwise use described voice playing time tag PTS that described local system clock STC is calibrated.
Default acceptable time threshold values S in the described decision device; Described decision device is used at the video playback time tag PTS of current video frame correspondence during greater than described local system clock STC, to the comparative result of described video playback module output playback current video frame; When also being used for difference at the described local system clock STC video playback time tag PTS corresponding and being less than or equal to described time threshold values S, show the comparative result of current video frame immediately to described video playback module output with current video frame; Also be used in the difference of the described local system clock STC video playback time tag PTS corresponding skipping the comparative result of current video frame to described video playback module output during greater than described time threshold values S with current video frame.
The invention has the beneficial effects as follows: the present invention is based on that the MPEG-2 system realizes looking, the method for audio sync is reference clock, serves as that the calibration clock recovery goes out local system clock STC with voice playing time tag PTS with local reference clock, and the broadcast situation of vision signal is adjusted by local system clock STC, on the basis of audio signal normal decoder and broadcast, realize the synchronous playing of video and audio frequency, avoided the shake of Program Clock Reference PCR and the situation that causes video and audio signal to jump simultaneously or reset.
Technical scheme provided by the invention has guaranteed the continuity of voice playing, has therefore significantly improved user experience.
The present invention is based on the adjusted in concert that the realization of MPEG-2 system is looked, the system of audio sync does not need voltage controlled oscillator realization clock, therefore significantly reduced hardware cost.
Description of drawings
Fig. 1 is the basic boom figure of existing IPTV system;
Fig. 2 is the data transfer mode schematic diagram of system layer in the existing MPEG-2 system;
Fig. 3 carries out the time model figure of coding and decoding Synchronous Processing for existing MPEG-2 system;
Fig. 4 is for adopting the schematic diagram of phase-locked loop recovery system clock STC in the existing MPEG-2 system;
Fig. 5 is for adopting the flow chart that system clock STC is recovered shown in Figure 4;
Fig. 6 is for the system clock STC realization that prior art adopts Fig. 4 to recover is looked, the flow chart of audio sync;
Fig. 7 the present invention is based on that the MPEG-2 system realizes looking, first kind of embodiment flow chart of method of audio sync;
Fig. 8 the present invention is based on that the MPEG-2 system realizes looking, second kind of embodiment flow chart of method of audio sync;
Fig. 9 the present invention is based on that the MPEG-2 system realizes looking, a kind of embodiment schematic diagram of system of audio sync;
Figure 10 is a kind of data queue processing mode schematic diagram of execution mode shown in Figure 9.
Embodiment
It serves as the local system clock STC of calibration clock as reference clock, with voice playing time tag PTS that the present invention is provided with local reference clock in the MPEG-2 system, after the video playback time tag PTS of current video signal correspondence and this local system clock STC compared, according to comparative result vision signal is play to realize the synchronous of video and audio frequency, the specific embodiment of the present invention is described below in conjunction with accompanying drawing.
As shown in Figure 7, the present invention is based on that the MPEG-2 system realizes looking, first kind of embodiment flow chart of method of audio sync may further comprise the steps:
Step S100: local system clock STC is set, and this local system clock STC as reference clock, and adopts current audio signals corresponding audio reproduction time label PTS as the calibration clock with local reference clock.
Local reference clock can be that the local crystal oscillator signal of 27MHz carries out accumulated counts and produces to frequency by counter, perhaps can select other clock sources for use.According to Moving Picture Experts Group-2, in transport stream, should send 10 voice playing time tag PTS and 10 video playback time tag PTS general each second at least, and local system clock STC adopts local reference clock when flat; When audio signal arrives decoder, decoder is decoded to it and is play, from transport stream, obtain current audio frame corresponding audio reproduction time label PTS simultaneously and it is judged, if current audio frame corresponding audio reproduction time label PTS is first voice playing time tag PTS of program, show that this program is new program, then this voice playing time tag PTS is changed to local system clock STC, if current audio frame corresponding audio reproduction time label PTS is not first voice playing time tag PTS of program, then use this voice playing time tag PTS that local system clock STC is calibrated.
Step S101: video playback time tag PTS and local system clock STC to current video signal correspondence compare, and handle the current video signal according to comparative result.When adopting the local crystal oscillator signal of 27MHz to produce local reference clock, after also need carrying out 300 frequency divisions to local system clock STC, the video playback time tag PTS of current video signal correspondence and the local system clock STC behind the frequency division are compared, and handle the current video signal according to comparative result.
The present invention is a reference clock with local reference clock, with voice playing time tag PTS serves as that the calibration clock recovery goes out local system clock STC, and the broadcast situation of vision signal is adjusted by local system clock STC, on the basis of audio signal normal decoder and broadcast, realized the synchronous playing of video and audio frequency, with available technology adopting Program Clock Reference PCR to looking, the decoding of audio signal is compared with the technical scheme that broadcast is adjusted simultaneously, has avoided the shake of Program Clock Reference PCR and the situation that causes video and audio signal to jump simultaneously or reset.
Generally speaking, video is play frequency and is respectively 25 frame/seconds and 30 frame/seconds under pal mode and TSC-system formula, because the residual effect of human eye, per second jump or several frames of resetting are difficult for being discovered, and people's hearing sensitivity is very high, and audio frequency slightly intermittently just is easy to be discovered, and therefore technical scheme provided by the invention has guaranteed the continuity of voice playing, under to the little situation of visual effect influence, significantly improved user experience.
As shown in Figure 8, the present invention is based on that the MPEG-2 system realizes looking, first kind of embodiment flow chart of method of audio sync may further comprise the steps:
Step S200: flow process begins, and looks, the audio signal normal transmission.
Step S201: obtain current audio frame corresponding audio reproduction time label PTS.In this step, voice data reads current audio frame corresponding audio reproduction time label PTS according to normal sample rate decoding output from transport stream.
Step S202: whether the voice playing time tag PTS that determining step S201 obtains is first voice playing time tag PTS of program, is then to enter step S204, otherwise enter step S203.
Step S203: current audio frame corresponding audio reproduction time label PTS is not first voice playing time tag PTS of program, then uses current audio frame corresponding audio reproduction time label PTS that local system clock STC is calibrated.
Step S204: current audio frame corresponding audio reproduction time label PTS is first voice playing time tag PTS of program, shows that this program is new program, then current audio frame corresponding audio reproduction time label PTS is changed to local system clock STC.
Step S205: the video playback time tag PTS that from transport stream, reads the current video frame correspondence.
Step S206: video playback time tag PTS and local system clock STC are compared, and default acceptable time threshold values S in the time of relatively for example should can be 1/2 frame of video time corresponding of broadcast by time threshold values S.
Step S207: judge that video playback time tag PTS is less than local system clock STC? be then to enter step S210, otherwise enter step S208.
Step S208: video playback time tag PTS shows that greater than local system clock STC video playback is very fast, and the current video frame of therefore resetting is waited for the synchronous playing of audio signal.
Step S209: whether the difference of judging local system clock STC and video playback time tag PTS is then to enter step S211, otherwise enters step S210 less than default time threshold values S.
Step S210: the difference of the video playback time tag PTS that local system clock STC is corresponding with current video frame is less than or equal to described time threshold values S, the reproduction time interval that shows the audio ﹠ video signal then shows current video frame immediately within acceptable scope.
Step S211: the difference of the video playback time tag PTS that local system clock STC is corresponding with current video frame shows that greater than described time threshold values S the vision signal broadcast is slower, then skips next frame of video of this presentation of video frames.
Step S212: finish.
As shown in Figure 9, the present invention is based on that the MPEG-2 system realizes looking, a kind of embodiment schematic diagram of system of audio sync comprises STC module 20, audio frequency PTS output module 10, video PTS output module 30, decision device 40 and video playback module 50.
Wherein, audio frequency PTS output module 10 is used to export current audio signals corresponding audio reproduction time label PTS to STC module 20.
STC module 20 is used to be provided with local system clock STC, and wherein, local system clock STC as reference clock, and adopts current audio signals corresponding audio reproduction time label PTS as the calibration clock with local reference clock.STC module 20 also is used for local system clock STC input decision device 40.
In a kind of execution mode, STC module 20 can be stc counter, system can further comprise local crystal oscillator, this this locality crystal oscillator is used to export the local crystal oscillator signal of 27MHz to STC module 20, stc counter carries out accumulated counts and produces local reference clock local crystal oscillator signal, and local system clock STC adopts local reference clock when flat.
After from the transport stream that audio frequency PTS output module 10 provides, obtaining voice playing time tag PTS, STC module 20 is used to also judge whether this voice playing time tag PTS is first voice playing time tag PTS of program, be to show that then this program is new program, therefore this voice playing time tag PTS is changed to local system clock STC, for example the count value with stc counter directly is changed to pts value, otherwise uses this voice playing time tag PTS that local system clock STC is calibrated.
Video PTS output module 30 is used to export the video playback time tag PTS of current video signal correspondence to decision device 40.
Decision device 40 is used for the video playback time tag PTS of current video signal correspondence and local system clock STC are compared, and output comparative result to video playback module is controlled broadcasting speed.
Preset acceptable time threshold values S in the decision device 40, for example equaled to play 1/2 pairing time of frame of video.
If the video playback time tag PTS of current video frame correspondence is greater than described local system clock STC, decision device 40 is to the comparative result of video playback module 50 output playback present frames; If the difference of the video playback time tag PTS that local system clock STC is corresponding with current video frame is less than or equal to described time threshold values S, decision device 40 shows the comparative result of current video frame immediately to 50 outputs of video playback module; If the difference of the video playback time tag PTS that local system clock STC is corresponding with current video frame is greater than time threshold values S, decision device 40 is skipped the comparative result of this frame of video to 50 outputs of video playback module.
Video playback module 50 is used for according to comparative result video information being handled, and has realized the synchronous playing of vision signal and audio signal.
As seen, the present invention is based on the adjusted in concert that the realization of MPEG-2 system is looked, the system of audio sync does not need voltage controlled oscillator realization clock, therefore significantly reduced hardware cost.
A kind of data queue processing mode such as Figure 10 of execution mode shown in Figure 9, transport stream enters sound, video preprocessor processing module carries out after demultiplexing handles, and audio coding frame, audio frequency PTS, video coding frame, video PTS enter corresponding formation respectively and transmit.
Wherein, the audio coding frame queue is through decoding back output audio frame queue, and the audio frame formation is sent to terminal equipment such as audio amplifier and plays by the audio signal output module.
Audio frequency PTS formation is exported to 20 pairs of local system clocks of STC module STC by audio frequency PTS output module 10 and calibrates.
Video PTS formation is exported to decision device 40 by video PTS output module 30, and the video playback time tag PTS and the local system clock STC of 40 pairs of current video signals of decision device correspondence compare and export comparative result.
The video coding frame queue enters output video frame queue behind the decoder, and the vision signal output module transmits frame of video to terminal equipments such as display, television sets, and its comparative result according to decision device 40 is play vision signal.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (10)

  1. One kind based on the MPEG-2 system realize looking, the method for audio sync, it is characterized in that, may further comprise the steps:
    Local system clock STC is set, and described local system clock STC as reference clock, and adopts current audio signals corresponding audio reproduction time label PTS as the calibration clock with local reference clock;
    Video playback time tag PTS and described local system clock STC to current video signal correspondence compare, and handle the current video signal according to comparative result.
  2. 2. method according to claim 1, it is characterized in that: described local system clock STC with local reference clock as the concrete grammar of reference clock is: local crystal oscillator signal is carried out accumulated counts produce local reference clock, with the reference clock of described local reference clock as described local system clock STC.
  3. 3. method according to claim 2 is characterized in that: the frequency of described local crystal oscillator signal is 27MHz; The concrete grammar that the video playback time tag PTS and the described local system clock STC of current video signal correspondence compared is: after described local system clock STC was carried out 300 frequency divisions, the video playback time tag PTS corresponding with the current video signal compared.
  4. 4. method according to claim 1, it is characterized in that: adopt current audio signals corresponding audio reproduction time label PTS to be: after obtaining current audio frame corresponding audio reproduction time label PTS from transport stream as the concrete grammar of calibration clock, judge whether first voice playing time tag PTS for program, be then described voice playing time tag PTS to be changed to described local system clock STC, otherwise use described voice playing time tag PTS that described local system clock STC is calibrated.
  5. 5. according to each described method in the claim 1 to 4, it is characterized in that: the concrete grammar of handling the current video signal according to comparative result is: default acceptable time threshold values S;
    If the video playback time tag PTS of current video frame correspondence is greater than described local system clock STC, the current video frame of then resetting;
    If the difference of the video playback time tag PTS that described local system clock STC is corresponding with current video frame is less than or equal to described time threshold values S, then show current video frame immediately;
    If the difference of the video playback time tag PTS that described local system clock STC is corresponding with current video frame is then skipped current video frame greater than described time threshold values S.
  6. 6. method according to claim 5 is characterized in that: described time threshold values S is for playing 1/2 frame of video time corresponding.
  7. One kind based on the MPEG-2 system realize looking, the system of audio sync, it is characterized in that: comprise STC module, audio frequency PTS output module, video PTS output module, decision device and video playback module;
    Audio frequency PTS output module is used to export current audio signals corresponding audio reproduction time label PTS to described STC module;
    The STC module is used to be provided with local system clock STC, described local system clock STC with local reference clock as reference clock, and adopt described current audio signals corresponding audio reproduction time label PTS as the calibration clock; Also be used for described local system clock STC is imported described decision device;
    Video PTS output module is used to export the video playback time tag PTS of current video signal correspondence to described decision device;
    Decision device is used for the video playback time tag PTS of described current video signal correspondence and described local system clock STC are compared, and the output comparative result is to the video playback module;
    The video playback module is used for according to described comparative result the current video signal being handled.
  8. 8. system according to claim 7 is characterized in that: also comprise local crystal oscillator, described STC module is a stc counter;
    Local crystal oscillator is used to export local crystal oscillator signal to the STC module; Stc counter is used for described local crystal oscillator signal is carried out accumulated counts and produces local reference clock.
  9. 9. system according to claim 6, it is characterized in that: after described STC module is used for obtaining current audio frame corresponding audio reproduction time label PTS from transport stream, judge whether first voice playing time tag PTS for program, be then described voice playing time tag PTS to be changed to described local system clock STC, otherwise use described voice playing time tag PTS that described local system clock STC is calibrated.
  10. 10. according to each described system in the claim 7 to 9, it is characterized in that: default acceptable time threshold values S in the described decision device;
    Described decision device is used at the video playback time tag PTS of current video frame correspondence during greater than described local system clock STC, to the comparative result of described video playback module output playback current video frame;
    When also being used for difference at the described local system clock STC video playback time tag PTS corresponding and being less than or equal to described time threshold values S, show the comparative result of current video frame immediately to described video playback module output with current video frame;
    Also be used in the difference of the described local system clock STC video playback time tag PTS corresponding skipping the comparative result of current video frame to described video playback module output during greater than described time threshold values S with current video frame.
CN 200910110051 2009-11-04 2009-11-04 MPEG-2 (Moving Picture Experts Group-2) system based method and system for realizing video and audio synchronization Pending CN101710997A (en)

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CN105451057A (en) * 2016-01-18 2016-03-30 北京优祥智恒科技有限公司 An apparatus and method for adjusting audio delay in a video and audio code stream
WO2017166497A1 (en) * 2016-03-31 2017-10-05 乐视控股（北京）有限公司 Method and apparatus for synchronously playing multimedia data
WO2018120557A1 (en) * 2016-12-26 2018-07-05 深圳市中兴微电子技术有限公司 Method and device for synchronously processing audio and video, and storage medium
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CN106878792A (en) * 2017-03-14 2017-06-20 上海兆芯集成电路有限公司 The audio synchronization method of video stream
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CN108632557A (en) * 2017-03-20 2018-10-09 中兴通讯股份有限公司 A kind of method and terminal of audio-visual synchronization
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US11146611B2 (en) 2017-03-23 2021-10-12 Huawei Technologies Co., Ltd. Lip synchronization of audio and video signals for broadcast transmission
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US10992843B2 (en) 2017-08-28 2021-04-27 Novatek Microelectronics Corp. Video interface conversion apparatus and operation method thereof
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CN113259725A (en) * 2021-04-14 2021-08-13 北京数字电视国家工程实验室有限公司 TS (transport stream) clock adjusting method, system, storage medium and electronic equipment
CN113259725B (en) * 2021-04-14 2022-08-05 北京数字电视国家工程实验室有限公司 TS (transport stream) clock adjusting method, system, storage medium and electronic equipment

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Application publication date: 20100519