mkvmerge

creates Matroska files

TLDR

Merge files

$ mkvmerge -o [output.mkv] [input1.mp4] [input2.mp4]

Add subtitles

$ mkvmerge -o [output.mkv] [video.mkv] [subtitles.srt]

Extract tracks

$ mkvmerge -o [output.mkv] --audio-tracks [1] [input.mkv]

Set default track

$ mkvmerge -o [output.mkv] --default-track [0:1] [input.mkv]

Split by size

$ mkvmerge -o [output.mkv] --split [700M] [input.mkv]

Add title

$ mkvmerge -o [output.mkv] --title "[Movie Title]" [input.mkv]

SYNOPSIS

mkvmerge [options] -o output inputs

DESCRIPTION

mkvmerge creates Matroska (MKV) files. It combines video, audio, and subtitles.
The tool is part of MKVToolNix. Supports many input formats and track manipulation.

PARAMETERS

-o FILE

Output file.

INPUTS

Input files.

--audio-tracks IDS

Select audio tracks.

--subtitle-tracks IDS

Select subtitle tracks.

--split SIZE

Split output.

--title TEXT

Set title.

--help

Display help information.

CAVEATS

No transcoding. Part of MKVToolNix. Complex track selection.

HISTORY

mkvmerge is part of MKVToolNix, providing Matroska container manipulation tools.