This is if you happen to know how far off the audio is from the video in this case 3840 milliseconds or 3.84 seconds
*ffmpeg -i "movie.mp4" -itsoffset 3.84 -i "movie.mp4" -map 1:v -map 0:a -c copy "movie-video-delayed.mp4"*Found this here: https://superuser.com/questions/982342/in-ffmpeg-how-to-delay-only-the-audio-of-a-mp4-video-without-converting-the-au The hard part is knowing how far out of sync the audio is from the video, but it's a quick change of the command line to experiment. I generally like to avoid re-encoding the video as Gibson mentioned. Assuming you're not doing cinematography, a re-encode may give you more options. On Tue, Sep 19, 2023 at 9:32 PM Michael L <[email protected]> wrote: > I do video editing as part of my job. > Suggestion #1: The Shotcut video editor allows you to separate the audio > from video and add audio delay by moving the audio down the timeline from > the video by 1 frame at a time or more. That's a tough and potentially > time consuming way to get it exact, but maybe you can fix it that way and > re render / export the file. > > I'll search for another way with FFMPEG and let you know if I find it .. > along with other info. > > On Tue, Sep 19, 2023 at 6:35 PM Curt Lundgren <[email protected]> wrote: > >> My brother sent me an MP4 file, about 900 MB, where the audio is at least >> a second ahead of video. I'd like to process the file so lip sync is >> proper, but my search engine fu is coming up short. ffmpeg seems like it >> would have the capability, but I haven't found a clue in the documentation >> or the man page. >> >> The video does not need to be changed in any way, but if possible, I'd >> like to boost the audio gain by as much as 10 db. >> >> I'd prefer to do this on a Linux machine, something running from command >> line would be ideal. Does anyone have a clue how this can be accomplished? >> >> Thanks >> Curt Lundgren >> >> -- >> -- >> You received this message because you are subscribed to the Google Groups >> "NLUG" group. >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/nlug-talk?hl=en >> >> --- >> You received this message because you are subscribed to the Google Groups >> "NLUG" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/nlug-talk/CADPPtrp%3Dqnd%3DzFSQXAxjNfPQfZALp1RaXve0tpgt0fCsVTxhiA%40mail.gmail.com >> <https://groups.google.com/d/msgid/nlug-talk/CADPPtrp%3Dqnd%3DzFSQXAxjNfPQfZALp1RaXve0tpgt0fCsVTxhiA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en --- You received this message because you are subscribed to the Google Groups "NLUG" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/nlug-talk/CALdmzXb3Du0JQsbHaARV3gBXBv205Xu68ht9fdzqjrD0BDmSTw%40mail.gmail.com.
