On Tue, 22 Jun 2021 at 11:15, <ibur...@compuscience.com> wrote: > Video 1 - 13 seconds with audio > Video 2 - 4 seconds without audio (I generated this video using xfade > transition > Video 3 - 4 seconds with audio > > If I concatenate video 1 and 3 everything works fine; audio synchronization > is correct from start to end. However, when I concatenate all 3 of them, the > audio from video 3 starts playing a little bit before the end of video 2. As > video 3 is a person talking, you clearly see that the audio doesn't match > the mouth movements. > > Why is this happening and how can I fix it?
Have you tried adding (silent) audio to video 2 and trying your join operation again? You could use `anullsrc': https://ffmpeg.org/ffmpeg-filters.html#anullsrc or make silent audio elsewhere and add to video 2 separately. You may also want to look up the `-shortest' option if you don't know of it already. Cheers, Rob _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
