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Use this:
$ ffmpeg -i color.mkv -vf format=gray -map 0:v -map 0:a:0 -map 0:11 \ -c:a copy -c:s copy grey.mkv
The maps set which tracks to include. The c with specifiers set the codec operation to copy for those specified streams.
map
c
Use
ffmpeg -i color.mkv -vf format=gray -map 0:v -map 0:a:0 -map 0:11 -c:a copy -c:s copy grey.mkv
