ffmpeg set subtitles track as default

Question

By adding an .ass subtitles track to an mkv video with ffmpeg, it isn\'t set as default track, so on playback you have to manually turn on subtitles. Is it possible to set t

Answer 1

You can use 'forced' instead of default to force vlc to play it

ffmpeg -f mp4 -i outfile.mp4 -f srt -i VTS_07_0.EnglishV2.srt -c:v copy -c:a copy -metadata:s:a:0 language=Japanese -c:s mov_text -metadata:s:s:0 language=English -disposition:s:s:0 forced mix.mp4