Downmix first audio stream from 7.1 to 5.1 keeping all other streams
ffmpeg -i in.mkv -map 0 -c copy -c:a:0 aac -ac:a:0 6 out.mkv
Useful for Roku which does not support 7.1.
Useful resources:
- https://trac.ffmpeg.org/wiki/Map
- https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio
- https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
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