[Ffmpeg-devel] Re: [Ffmpeg-user] ffmpeg encoding, reallyslowvideo when recording with audio

Luca Abeni lucabe72
Fri Feb 3 15:45:12 CET 2006


On Fri, 2006-02-03 at 14:42 +0100, Michael Niedermayer wrote:
> ffmpeg does contain code to compensate samplerate drift, dunno if its
> used for capturing audio+video though and obviously it depends upon
> correct timestamps, if the timestamps are calculated by 
> sample_number/sample_rate it wont work
After various hours, audio and video are still in sync. So, the code in
ffmpeg is working ok (I just have to remember to use the "async"
option :). And libavformat seems to be producing proper timestamps.

Now, I'd like to use the video card as a time-source for synchronization
(so that no video frames are dropped/duplicated, but A/V Sync is
mantained by resampling the audio). But I do not know how to achieve
this result... I'll probably have to modify ffmpeg.c for this purpose.
But I'll look at this next week.

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