MKVToolNix is the one of the best collection of tools (mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg) for modifying MKV files.

The graphical user interface (GUI) of the program allows you to manipulate Matroska (MKV) files in several ways.

You can use those tools to create, split, edit, mux, demux, merge, extract or inspect Matroska files.

MKVToolnix will also work with other video formats. Such as AVI, MPEG, MP4, MPEG, Ogg/OGM, RealVideo, MPEG1/2, H264/AVC, Dirac, VC1.

And more as well as some video codecs such as VP9 video codec support – reading from IVF, Matroska, WebM files, extract to IVF files.

Moreover the program can work with audio files such as AAC, FLAC, MP2, MP3, AC3, DTS/DTS-HD, Vorbis, RealAudio. And also work with most subtitle formats including SRT, PGS/ SUP, VobSub, ASS, and SSA.

It is a cross-platform application that will work on Microsoft Windows (both 32 and 64-bit versions), Apple macOS and Linux operating systems.

Here is also the portable version which does not require installation. You just need to start the function. It can also be stored on external devices and run on any computer you have access to.

# Version 89.0 “And the Melody Still Lingers On (Night in Tunisia)” 2024-12-27

## New features and enhancements

* mkvmerge: AC-3 writer: mkvmerge will now use the codec ID `A_AC3` even for
streams with bitstream IDs 9 or 10 instead of the deprecated codec IDs
`A_AC3/BSID9` & `A_AC3/BSID10`. Fixes #2387.
* MKVToolNix GUI: multiplexer: the mechanism for setting track languages to
specific values upon adding a file has gotten a new option to always set the
language, no matter whether or not the source container provided a track
language or what it was set to.
* all command-line tools: implemented an escape mechanism for when you want to
use the `@` sign as the first character in an argument to an option such as
`–title`. To escape it the `@` sign has to be doubled as in `–title
@@midnight`. Implements #3768.

## Bug fixes

* mkvmerge, mkvpropedit, MKVToolNix GUI’s multiplexer & header editor: the
MIME type for TrueType & OpenType fonts will be set properly to either the
current MIME types `font/ttf` & `font/otf` or to the legacy MIME types
`application/x-truetype-font` & `application/vnd.ms-opentype` depending on
whether the “use legacy font MIME types” option is disabled or enabled, even
if the MIME database used by Qt returns the wrong one or even other MIME
types such as `application/x-font-ttf` & `application/x-font-otf`. This was
the case on Windows due to Qt 6.7.3 switching to a different embedded MIME
database. Partially fixes #3751.
* MKVToolNix GUI’s multiplexer & header editor: ensured that both the legacy &
the current font MIME types are always present in the MIME type combo boxes
of attachments, no matter what Qt’s MIME type database contains. Partially
fixes #3751.
* MKVToolNix GUI: the “disable tooltips” option in the preference will now
disable the tooltip for the status bar, too.

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