5  /  690 Reviews
May 1, 2020 Last updated


Older Versions

# Change Log

# Version 46.0.0 "No Deeper Escape" 2020-05-01

## New features and enhancements

* mkvmerge: when splitting, the placeholder `%c` can be used in the

destination file name. It'll be replaced by the name of the first chapter in

the file. Implements #2791.

* mkvmerge: when reading MPLS playlists mkvmerge will include a tag named

`SOURCE_ID` in the track's statistics tags that conveys the fact that the

source was a Blu-ray and what the track's ID was in the source

container. When reading Matroska file existing `SOURCE_ID` tags will be

kept. The format used is the same format MakeMKV uses. Implements #2774.

* mkvmerge: for audio-only files mkvmerge will now write a cue entry every

500ms instead of every 2s.

* MKVToolNix GUI: job actions: split up the option "execute when the job

finishes successfully or with warnings" into two separate options: "…when

finishes successfully" and "…when exits with warnings". Implements #2798.

## Bug fixes

* mkvmerge: Matroska reader: when regenerating UIDs for chapters mkvmerge will

now fix referencing tag chapter UID targets to have the same values. Fixes


* mkvmerge: MP4 reader: fixed a crash that could potentially happen while

trying to identify H.265/HEVC tracks.

* mkvmerge: MP4 reader: when reading H.265/HEVC tracks without a frame offset

table (`ctts` atom) present, mkvmerge did not parse the `hevcC` structure

correctly in certain cases, causing no video frames to be output at all or

the output not being playable. This fixes #2782, a bug introduced in v45.

* mkvmerge: MPLS handling/MPEG TS reader: timestamp restrictions as given in

an MPLS file were only honored for the first play item, not for subsequent

play items. For those play items the whole referenced file was always

copied. Part of the fix of #2789.

* mkvmerge: MPLS handling/MPEG TS reader: under certain circumstances mkvmerge

copied one frame too many before switching to the next play item. Part of

the fix of #2789.

* mkvmerge: for audio-only files cues will only be created for I frames

(important for e.g. TrueHD where decoding can only start on a sync

frame). Fixes #2790.

* MKVToolNix GUI: fixed a crash that happened when closing the preferences

after having closed at least one multiplexer tab. Fixes #2785.

* MKVToolNix GUI: macOS: changed the default of the "elide tab header labels"

feature introduced in v45 from "no" to "yes" to mirror how versions before

v45 behaved on macOS.


MKVToolNix is a small collection of tools (mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg) that allows you to manipulate Matroska (MKV) files in several ways.

You can use MKVToolNix to create, split, edit, mux, demux, merge, extract or inspect Matroska files. The program will also work with other video formats (AVI, MPEG, MP4, MPEG, Ogg/OGM, RealVideo, MPEG1/2, h264/AVC, Dirac, VC1) including some video codecs (such as VP9 video codec support - reading from IVF/Matroska/WebM files, extract to IVF files). Audio formats (AAC, FLAC, MP2, MP3, (E)AC3, DTS/DTS-HD, Vorbis, RealAudio) and also most subtitle formats (SRT, PGS/SUP, VobSub, ASS, SSA, etc.). MKVToolNix is a cross-platform application that will work on Windows® (both 32 and 64-bit versions), Mac® OS X® and Linux. Please note that from this page you can download the Windows® (installer and portable) and Mac® OS X® versions. If you're looking for a Linux version, you can download one from MKVToolNix homepage.

Trademark Note 1: Microsoft®, Windows® and other product names are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

Trademark Note 2: Mac and OS X are trademarks of Apple Inc., registered in the U.S. and other countries.

MKVToolNix Review

Note: I tested MKVToolNix on Windows® 7 Ultimate 32-bit using mkvmerge GUI and several other tools opened from the Command Prompt such as mkvinfo. Therefore, if you're looking for more information on how to compile MKVToolNix yourself, check the README file (online). I wanted to test two things: the mkvmerge GUI (software interface) and see how easy or hard is to use the command line for all the other tools such as "mkvinfo."

The software interface (mkvmerge GUI)

As soon as the setup finished, I opened the "mkvmerge GUI" shortcut from my desktop. At a first look, the interface seems quite intuitive, so my first action was to open an MKV file, select an option and see the result. I went to program interface at the "Input" tab and used the "Add" button (it also works using the "drag and drop" method. 

I selected a 710 MB MKV file and I wanted to split this (from "Global" tab - select "Split Mode" - "split after size" and then I specified the size - in this case 50M = 50MB) in smaller files with a size of 50 MB for each. Finally, I clicked on "Start Muxing" button. 

The program required just 45 seconds for this operation, and the result was 14 smaller MKV files. After this, I wanted to mux the content of an AVI file in MKV format. Again, I went to "Input" tab and used the "Add" button, I selected an AVI file from my computer, and I noticed that the program displayed the Output filename automatically with the name of the same file but this time in MKV (Matroska) format. 

Again, the same button called "Start Muxing" was doing all the magic. This time the process was even faster - at the end I could read the following message "Muxing took 34 seconds".

Other command line tools (example: mkvinfo)

To use all the other command line tools in Windows®, open a Command Prompt window. Just hit the "Start" button, click on "Search programs and files" (Windows® 7 and Vista) or "Run" (Windows® XP and others) and type either "cmd" or "command prompt" (without the quotes). 

In the command prompt, you can try each program (mkvmerge, mkvinfo, mkvextract, mkvpropedit) by typing its name and the usage parameters. An example would be: "mkvinfo --help" that will display a list with all the commands available. I tried mkvinfo using this command: "mkvinfo -g" and the result was a small interface that allowed me to open an MKV file and see all kind of technical details about it. I was also able to save the results in the TXT format.


You can launch an instance of mkvmerge GUI (software interface) directly from the command prompt. Just type "mmg" and hit "Enter."

Besides of the usual standard documentation from the command prompt (I hate it because it's hard to read) you can find and read the online documentation available on MKVToolNix documentation homepage here: (use the blue links for mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg to access the online help).

Final Conclusion

You can learn how to use several main features in minutes but to master the program, it does require more time. Your best bet is to experiment all of his options and whenever you need some help, check the FAQ section (filled with great answers to common issues), start with the guide of mkvmerge GUI here and check the documentation for all the other tools - here (provided once again). MKVToolNix is a "must-have" software if you work with MKV files. It has an incredible amount of features that are not listed on the homepage. Ultimately, if you appreciate this tool, please consider a DONATION to support the work of Mr. Moritz Bunkus, the author of MKVToolNix.

Found this software useful? Please consider a donation to the author.