5  /  699 Reviews
May 30, 2020 Last updated


Older Versions

# Change Log

# Version 47.0.0 "Black Flag" 2020-05-30

## New features and enhancements

* mkvmerge: chapters: mkvmerge can now read chapters from DVDs if the user

specifies the path to a DVD folder structure via the `--chapters …`

parameter. By default chapters from the first title will be imported. This

can be changed by append `:title number` to the file/directory name in the

`--chapters …` argument, e.g. `--chapters /srv/dvds/BigBuckBunny/VIDEO_TS:3`

This feature requires mkvmerge to have been built with the `libdvdread`

library. Part of the implementation of #2808.

* mkvmerge: added `--engage append_and_split_flac` that enables mkvmerge to

append and split FLAC tracks, restoring pre-v45 behavior. The resulting

tracks will be broken: the official FLAC tools will not be able to decode

them and seeking will not work as expected.

* MKVToolNix GUI: multiplexer: added support for mkvmerge's new support for

reading chapters from DVDs if both have been built with the `libdvdread`

library. Part of the implementation of #2808.

* MKVToolNix GUI: multiplexer: when deriving languages from file names the GUI

will now look for simplified language names instead of the full ones

(e.g. instead of looking for "Greek, Modern (1453-)" it would simply look

for "Greek").

* MKVToolNix GUI: multiplexer: the options in the "additional command-line

options" dialog are now sorted alphabetically. Additionally the

`--append-mode` option has been added as one of the only missing global


* MKVToolNix GUI: chapter editor: the chapter editor can now read chapters

from DVDs if MKVToolNix has been build with the `libdvdread` library. Part

of the implementation of #2808.

* MKVToolNix GUI: header editor: added an option in the preferences for

displaying all date & time values in UTC instead of the local time

zone. Implements #2814.

## Bug fixes

* all: fixed a crash when using the `MTX_LOGGER=file` syntax for logging debug

messages without specifying a file name to log to. It will now log to a file

called `mkvtoolnix-debug.log` in the system's default temporary directory,

as initially intended.

## Build system changes

* The [`libdvdread`](

library will be used if found via `pkg-config`. If it is found, support for

reading chapters from DVDs will be enabled in `mkvmerge` and the MKVToolNix

GUI. Part of the implementation of #2808.

* Boost's Date/Time, Lexical Cast, Range, Range Adaptors, Tri-Bool, Variant

libraries are not used anymore.

* MKVToolNix now requires a C++ compiler & standard library that support the

following features of the C++17 standard: "`std::variant`", "`std::gcd`".

For the GNU Compiler Collection (gcc) this means v7 or newer; for clang it

means v4 or newer — the same versions required by earlier MKVToolNix


* MKVToolNix now requires version 6.1.0 of fmtlib or later for the

`fmt::to_string` function and bugfixes to the formatting of floating point

numbers. If a system-wide version is installed that's older, the bundled

copy will be used.

* The bundled version of fmtlib has been updated to release 6.2.1.


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.