[FFmpeg-user] video stream out of sync

Anthony Brown av at bsbc.nb.ca
Tue Apr 19 15:50:02 CEST 2011

On 11-04-19 10:29 AM, Adrian Dusa wrote:

> Oh, that might be one solution, only from the man of ffmpeg I am
> unable to figure out what values of the async stretch or squeeze.

The documentation is a bit sketchy on that (and many other points), but 
them as complain can feel free to rewrite it :).  AFAIK, -async X will 
resample the audio track to speed up or slow down by as much as X 
samples per second as required to match the video timestamps.  You 
probably don't need to make big adjustments, you're talking 1 second in 
5 minutes, less than 1%.  If you sample audio at 48000 an -async 480 
would be more than enough to compensate.

> - how to grab the "desktop" sound instead of the "mic" sound?

Can't help you there.


Anthony Brown
Audiovisual coordinator
Brunswick Street Baptist Church
Telephone: (506)-458-8348 (leave message)
Email:     av at bsbc.nb.ca
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