Modifying track data in Matroska (mkv) files

While one can easily use mkvtoolniv gui to change default language for audio tracks or subtitle languages, this is as well possible without any remux from the command line with the mkvpropedit command.

Below is an example to change the first audio track to French and make it the default one, while turning the default off for the second audio track.

mkvpropedit file.mkv --edit track:a1 --set flag-default=1 --set language=fre --edit track:a2 --set flag-default=0

c@workstation ~ $