MPEG-2传输流中的时间信息与音视频同步

Timing information and synchronization of audio and video in MPEG-2 transport stream

文中讨论了MPEG 2传输码流中的时间信息 (传输层中的节目参考时钟 ,PES层中的显示时间标签和节码时间标签 )在音视频同步中的作用。对理想解码器中的音频、视频同步原理作出了分析。指出了实际解码器实现视音频同步的困难之处并提出了解决办法。对实际解码中出现的视音频失同步的情况 ,通过对解码器的控制达到重复帧和丢帧的效果 ,从而重新实现了音、视频的同步。

The timing information (PCR in the TS layer, PTS and DTS in the PES layer) in the MPEG-2 transport stream is discussed in this paper, and its function on synchronizing the video and audio in a decoder is pointed out. The principle of synchronizing the video and audio in an ideal decoder is discussed. The difficulty to realize this in a practical decoder and the corresponding method to overcome it are pointed out. Using the repeat frame and skip frame manner to make it resynchronize when losing synchronization with audio and video in decoding process. \;