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

• Add a subtitle track to a file:

mkvmerge --output path/to/output.mkv path/to/file.mkv path/to/subs.srt