Mono/stereo problem with videos files. How to fix?
from Churbleyimyam@lemm.ee to linux@lemmy.ml on 11 Jun 21:39
https://lemm.ee/post/34380392

I have some video files which have stereo audio tracks that were created from a mono source. I think the mono signal got sent to the right channel and not the left because when I created the files in OBS I forgot to select mono audio recording. When I play the videos all the sound is on right side only. Hope that makes sense…

How can I either mix down/combine the stereo tracks intoto a single mono track or replace the empty left channel with the audio content of the right channel? Is there a way to do this without reencoding the whole video file?

I could do it in a video editing gui by copypasting the audio track to the other empty channel but I wonder if there might be a more efficient way of doing it. An ffmpeg command perhaps?

Many thanks

#linux

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Max_P@lemmy.max-p.me on 11 Jun 22:00 collapse

FFmpeg should be able to do that without reencoding the video, possibly also audio. Basically you want to use -c:v copy -c:a copy and remap the right channel to a single mono channel, and remux all of that in a new output file.

trac.ffmpeg.org/wiki/AudioChannelManipulation