Input:
* One Video
* 4 audio streams
* Many subtitles
* Chapters
I want to re-encode one of the audio streams (the first one) and keep everything else as-of (copy).
Is it possible to do that in one command-line in ffmpeg?
So far my best 2 guesses don't work:
ffmpeg -i input.mkv -map_metadata 0 -map 0:v -c:v copy -map 0:s -c:s copy -map 0:a:0 -c:a ac3 -vbr 3 -map 0:a:1 -c:a copy -map 0:a:2 -c:a copy -map 0:a:3 -c:a copy output.mkv
Copies everything
ffmpeg -i input.mkv -map_metadata 0 -map 0:v -c:v copy -map 0:s -c:s copy -map 0:a -c:a copy -map 0:a:0 -c:a ac3 -vbr 3 output.mkv
Re-encodes all audio streams