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 90.0 “Hanging On” 2025-02-08

## New features and enhancements

* MKVToolNix GUI: header editor: double-clicking on one of the three flag
indicators (“Default track”, “Forced display”, “Enabled”) for a track in the
tree view will now toggle the corresponding flag. Implements #3773.

## Bug fixes

* mkvmerge: AAC parser: LOAS/LATM streams: fixed use of uninitialized data
when the `StreamMuxConfig` element doesn’t contain the `audioMuxVersion`
element; version 0 must be assumed in such a case. The result was that
sometimes certain valid AAC packets were dropped. Fix by Stefan Pöschel.
* mkvmerge: HEVC/H.265 parser: fixed calculation of picture order count
calculation that was triggered under rare circumstances. Fixes #3775.
* mkvmerge: Matroska reader: enabled limits for how much data a single
Matroksa reader instance might buffer when the muxing core looks for packets
for specific tracks, avoiding huge memory consumption in cases where tracks
have huge gaps between packets. This might happen when appending files
containing forced-only subtitle tracks, for example. Fixes #3771.
* mkvmerge: TrueHD reader: increased the probe range for TrueHD sync frames
from 128 KB to 512 KB to avoid mis-detection with certain files with a lot
of data between sync frames. Fixes #3783.
* mkvmerge: MP4/QuickTime reader: fixed detection of Big Endian LPCM
audio. Fixes #3788.

## Build system changes

* The bundled `fmt` library was updated to v11.1.2.
* added a new option to `configure` called `–disable-dbus` to disable looking
for & using QtDBus even if it’s present on the system. Default remains to
probe for its existence. Patch by Anthony Ryan.

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