[Ffmpeg-devel] [PATCH]: A/V sync on nsv streams.

elupus elupus
Fri Oct 27 03:18:54 CEST 2006

The current nsv demuxer in ffmpeg doesn't handle discontinuous nsv streams
very well. This is streams that might send a commercial before the actual
program. When the stream switches the video is garbled and a/v desync

A sample for this can be tried here;stream.nsv,
(NOTE adult nature)

The nsv streaming format sends a parameter on each nsvf frame about the
difference in timestamp between audio and video on that packet. So here is a
patch that uses that information to set the dts value of the audio packet,
fixes A/V sync on these types of streams.

Also, as noted by docs, the normal place a keyframe occurs is also on these
sync frames, so I set the key flag only in those cases, should atleast be a
little bit better. Currently, the video still breaks up on the change as the
demuxer doesn't notify codec's on the content change, but i'm not sure how
to solve that.

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