[FFmpeg-devel] [PATCH] Fix DVCPRO HD 720p Audio Timestamp Generation

Brian Brice bbrice
Fri Jun 19 22:38:36 CEST 2009


I have found that DVCPRO HD 720p clips have PTS values generated
slightly incorrectly and have attached a patch that should fix it.
Roman, of course, can verify the logic is correct.

The thing with these 720p clips there's 2 video frames within a buffer
that is the size of one 1080i DV frame, but 1 audio frame for 8
channels (4 streams of stereo).  First 4 channels are with the first
720p frame, and the last 4 channels are with the second 720p frame.
All 8 channels (or 4 streams) should have the same PTS throughout the
duration of 2 720p frames.

For example, you would get a PTS of 0 for audio streams 1 and 2, then
PTS 1602 for audio streams 3 and 4.  This patch moves the byte count
increment until after the last 2 audio streams have been read.


Brian Brice
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