mkvmerge

Merge and extract multimedia streams. More information: https://mkvtoolnix.download/doc/mkvmerge.html.

• Display information about a Matroska file:

mkvmerge --identify {{path/to/file.mkv}}

• Extract the audio from track 1 of a specific file:

mkvextract tracks {{path/to/file.mkv}} {{1}}:{{path/to/output.webm}}

• Extract the subtitle from track 3 of a specific file:

mkvextract tracks {{path/to/file.mkv}} {{3}}:{{path/to/subs.srt}}