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How to extract subtitles with ffmpeg - Nicolas Bouliane
https://nicolasbouliane.com/blog/ffmpeg-extract-subtitles#:~:text=ffmpeg%20-i%20input.mkv%20-map%20%220%3Am%3Alanguage%3Aeng%22%20-map%20%22-0%3Av%22%20-map,if%20you%20want%20a%20different%20type%20of%20subtitles.
video - ffmpeg: set the language of an audio stream ...
https://stackoverflow.com/questions/44351606/ffmpeg-set-the-language-of-an-audio-stream
As you can see in there: "Stream #0:0 (eng)", "Stream #0:1 (nl)" & "Stream #0:2 (eng)". So that looks fine. But when I open it in VLC, I see under Audio tracks: NL - [English] ENG - [English] So I went back to check on ffmpeg with "ffmpeg -i output.mp4": Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4': Metadata: major_brand : isom minor ...
#540 ((audio) selection of streams by language) – FFmpeg
https://trac.ffmpeg.org/ticket/540
Description. Hi, I'd like to select the language of an input file by language. e.g. ffplay -alang ger file.mkv. or. ffmpeg -i file.mkv -map 0:a:ger dest.mkv. or similar. An open issue would be the presence of two audio stream of the same language.
ffmpeg copy highest quality audio track of a specific language
https://video.stackexchange.com/questions/27836/ffmpeg-copy-highest-quality-audio-track-of-a-specific-language
So, you'll need a two-stage process to do this: ffmpeg -i in.mkv -map 0:a:m:language:eng -vn -acodec copy -f nut - | ffmpeg -f nut -i - -c copy output.flac. The first ffmpeg process sends all English language audio streams to the 2nd ffmpeg process, which will select only the 'best' among the received streams for output.
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