Audio/video sync software for Linux (preferably open source) I'm looking for a program that can synchronize audio and video from separate files. PluralEyes does this. I'm looking for something that runs on Linux and preferably is open source.

I imagine a CLI that goes like this:

$ clappersyncoffsets in.pm4 in.wav
0s 3.876s
$
I assume that you have a sound channel recorded on the camera which is in sync with the picture. In that case you only have to find the offset between the audio channels.

This tool claims just that: https://github.com/bbc/audio-offset-finder

I never tried it yet, but I would be very interested on your experiences if you would give it a try.