[FFmpeg-user] How to change audio stream offset

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Leonard Bogard
> Sent: 05 September 2013 17:09
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] How to change audio stream offset
> 
> On Thu, Sep 5, 2013 at 12:33 AM, Francois Visagie <
> francois.visagie at gmail.com> wrote:
> 
> > Hi All,
> >
> >
> >
> > I'm getting a few cases where only ffmpeg correctly understand the AV
> > sync in its mp4 output, in the sense that other applications play
> > audio too early wrt. video. I'm trying to correct that after encoding
> > with '-itsoffset' but not having much luck. The offset between audio
> > and video remains unchanged.
> >
> >
> >
> > I'll be grateful for any suggestions to help fix this.
> >
> >
> >
> > Here's the command line as well as console output; in this case audio
> > needs to be delayed by 650ms (I assume that '-itsoffset' applies to
> > the next specified input file?):
> >
> >
> >
> > C:\Users\fvisagie\Videos\My DVDs\MainMovie\Neil Diamond Live at the
> > Greek\VIDEO_TS>ffmpeg -i "Neil Diamond Live at the Greek.mp4"
> > -itsoffset
> > 00:00:00.650 -i "Ne
> >
> > il Diamond Live at the Greek.mp4" -map 0:v -map 1:a -c: copy zzz.mp4
> >
> >
> This is a command line I used to shift the audio track in my videos:
> ffmpeg -i "Neil Diamond Live at the Greek.mp4" -itsoffset 0.650 -i "Neil
> Diamond Live at the Greek.mp4" -map 0:0 -map 1:1 -acodec copy -vcodec
> copy "Neil Diamond Live at the Greek (fixed).mp4"

Thanks for the suggestion, but unfortunately the result is the same as
before - audio remains 650ms too early.