The robustness which recovers the program time base in the MPEG-2 transport stream, actualizes audio/video same period method

摘要

Internal system time clock 201 inside the MPEG-2 decoder, in program clock reference time stamp inside the MPEG-2 transport stream which is received, is not value, in frequency and option same period it does with phase. The demultiplexes 202 which separates audio and the video packet from the transport stream before transferring to audio and the video decoder, modifies the packet decoding and presentation time stamp inside that kind of packet, at least with the offset with program clock reference time stamp value and internal system time clock time. The discontinuity in the program clock reference time stamp sequence makes the change of the offset cause automatically, the internal system time clock continues to increase monotonously with that, decoding inside the packet or times when presentation time stamp makes suddenly invalid there is no.