[FFmpeg-user] How to fix audio/video out of sync problem

[肖谋]

Thanks. But if i don't know the offset, how can I get that in an effective
way.  Generating two intermediate files will degrade system i/o performance.


Regards
xiaomou





On Wed, May 22, 2013 at 5:24 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> 肖谋 <xiaomou <at> gmail.com> writes:
>
> > I have a mp4 file 1.mp4 in which the audio is about
> > 2 seconds ahead of video. I want to fix this using
> > ffmpeg without transcoding, just copy.
>
> -itsoffset may help:
> $ ffmpeg -i 1.mp4 -itsoffset 2 -i 1.mp4 -codec copy -map 0:0 -map 1:1 2.mp4
>
> You may have to move the itsoffset (and change between 2 and -2).
>
> Carl Eugen
>
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