MPEG: Presentation Time Stamp (PTS), Decode Time Stamp (DTS)
Presentation time stamps (PTS) can be embedded in MPEG transport stream to avoid AV-sync drift. Unfortunately these time stamps are often added after the video undergoes frame synchronization, format conversion and pre-processing, thus those delays remain uncompensated.
Read more about this topic: Audio To Video Synchronization
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—William Shakespeare (1564–1616)