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The Realization of Audio/Video Synchronization for MPEG-2

Author: ZhuoZhiFeng
Tutor: PangYanWei
School: Tianjin University
Course: Signal and Information Processing
Keywords: MPEG-2 PTS Audio and video synchronization PAT Demultiplexing
CLC: TN949.197
Type: Master's thesis
Year: 2010
Downloads: 124
Quote: 1
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Abstract


After the 20th century , the digital television technology and the rapid development of multimedia communication technology , which greatly improves the way people work efficiency, reduce the social burden of transportation , to change people's education and entertainment. Digital audio and video processing and transmission of digital television technology and multimedia communications technology is the core , the International Organization for Standardization and the International Electrotechnical Commission developed a corresponding series of sound , image compression coding of international standards. Which , MPEG-2 in a wide range of audio and video signal encoding effectively , is widely used in digital cable television, satellite digital television broadcasting system . Audio and video synchronization is under the MPEG-2 standard to achieve real-time decoding difficulties . Traditional audio and video synchronization technique is the use of MPEG-2 transport stream a PCR to recover the end of the same encoding system clock STC, through audio and video time stamp PTS / DTS comparison with the system clock to synchronize playback. In this paper the analysis of MPEG-2 standard , based on the study of a new audio and video synchronization algorithms, without restoring STC, but in the audio -based media streaming, video streaming from the media , to keep audio playback rate is unchanged , based on the same time basis using the media unit of the time tag , by adjusting the playback of the video frame rate to achieve media synchronization . This paper introduces the MPEG-2 system layer syntax highlight any of the TS packet , PES packet and PSI segment structure . With PAT and PMT to achieve a transport stream demultiplexing, and won for the audio and video synchronization time stamp PTS. On this basis , the PTS of the audio as a time reference by comparing the video and audio PTS PTS gap to adjust video playback , audio and video synchronization eventually . Experimental results show that the proposed method can effectively implement audio and video synchronization . After adjustment, the percentage reached 98.68% synchronization , critical percentage, and desynchronization percentage accounted for 0.59% and 0.72% respectively .

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