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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2020-04-16 03:47:17

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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