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Say I have a video of a talk but the soundtrack is bad, and I happen to have an audio recording of the same talk made with a good mike. Is there a way, with ffmpeg, to replace the bad audio with the good one, automatically synchronizing the two (the good mike was not started at the same time as the camera, and I don’t want to manually specify the shift)?

Can ffmpeg do that? I have found many questions about swapping/merging audio streams, but not much about synchronizing them first.

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  • try -itsoffset → ffmpeg -i "0.mp4" -itsoffset -1.12 -i "1.mp4" -map 0:v:0 -map 1:a:0 -c copy "out.mp4"
    – Баяр Гончикжапов
    Commented May 4 at 3:59
  • @БаярГончикжапов But that’s not automatic synchronizing, right? I need to manually calculate the offset with this solution?
    – Sulli
    Commented May 4 at 7:55
  • Ah, yes, I'm sorry. I didn't understand request.
    – Баяр Гончикжапов
    Commented May 5 at 3:10
  • I use the free version of DaVinci Resolve to do my video editing, including automatically aligning my separately recorded audio to my video. But I don't know whether this is a built-in function of ffmpeg.
    – music2myear
    Commented May 5 at 16:36
  • @music2myear ah yeah and I use Adobe Premiere to do the same thing usually, but I’d like to do everything from the command line now!
    – Sulli
    Commented May 6 at 8:04

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