[FFmpeg-user] A/V synchronization problems

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Sep 5 14:21:11 CEST 2014

Elżbieta Jakubska <elzbieta.jakubska <at> gmail.com> writes:

> I have a problem with A/V synchronization when the 
> source signal is disturbed. I am using the 
> following command for transcoding my video:
> ffmpeg -y -probesize 6000000 -threads 1 -i $filename 
> -vf scale=256:144 -b:v 192k -acodec libmp3lame 
> -b:a 128k -ac 1 -af aresample=async=1000 -ss 0
> -threads 1 -t 3720 -f avi $filename.avi

I believe the following works fine:
$ ffmpeg -i input -vf scale=256:144 -b:v 192 
-acodec libmp3lame -b:a 128k -ac 1 -async 1 -ss 0 out.avi

This is not a regression, -async 1 was always necessary 
for such files with reception errors.

Carl Eugen

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