mkvpropedit movie.mkv --edit track:a1 --set language=eng --edit track:v1 --set language=eng
mp4box -lang 1=eng -lang 2=eng movie.mp4mkvpropedit movie.mkv --edit track:a1 --set language=eng --edit track:v1 --set language=eng
mp4box -lang 1=eng -lang 2=eng movie.mp4