notes/content/shell/ffmpeg-downmixing-audio.md

title	tags	emoji	link
Downmixing audio channels	Media	🎵	https://trac.ffmpeg.org/wiki/AudioChannelManipulation

ls -1 *.mp4 | xargs -I{} ffmpeg -y -i {} -ac 2 -c:v copy /path/to/out/{}

Downmixes multi-channel audio into stereo. Reduces the chances of weird things happening during playback.

-c:v copy is important for performance as it means the video isn't re-encoded (10x improvement in speed).