# Change Log
# Version 53.0.0 "Fool's Gold" 2021-01-30
## New features and enhancements
* mkvmerge: AVI reader: added support for reading the video aspect ratio from
the video properties header (`vprp` chunk) if present and setting the
display dimensions accordingly. Implements #2993.
* mkvmerge: MP4 reader: for h.264/AVC tracks that don't have an
`AVCConfigurationBox` (`avcC` atom) in their sample description (`stsd`)
atom or whose `avcC` atom contains no content `mkvmerge` will now re-derive
the `AVCConfigurationBox` from the bitstream. Implements #2995.
* mkvextract: mkvextract will now check if any of the destination file names
is the same as the source file name and abort with an error if that's the
case. Implements #3001.
* MKVToolNix GUI: when querying the user for a file name for saving things
(e.g. multiplexer settings or an attachment in the header editor), the
automatically suggested file name will now be based on the
situation-specific file names (e.g. the destination file name for
multiplexer settings or the attachment's name when saving an attachment in
the header editor) instead of the directory's name. Implements #3012.
* MKVToolNix GUI: multiplexer: when deriving track languages from file names
the GUI will now select the right-most match instead of the left-most
one. For example, "La.vie.en.rose.(fr).srt" will now be detected as French
(fr) instead of English (en). Implements #3013.
* MKVToolNix GUI: preferences: the items in the "pre-defined …" lists can now
be renamed by double-clicking with the mouse or pressing the F2 key.
* Windows installer: the `bluray_dump` command-line utility will be installed
into the `tools` sub-directory. `bluray_dump` can read & dump certain file
types used on Blu-rays: `.mpls` playlists, `.clpi` clip information
databases, `.bdmv` index files, `bdmt_….xml` disc library databases and
`tnmt_….xml` track & chapter name databases.
## Bug fixes
* mkvmerge: stretching chapter timestamps with `--chapter-sync` now works
correctly with floating point values including fractions of floating point
numbers (e.g. `12.3/45.67`). The tooltips in the GUI have been adjusted
accordingly. Fixes #3002.
* mkvmerge: MPEG 1/2 video handling: the "default duration" header field was
often half the value it actually should be, resulting in all video frames
having an explicit block duration with the correct value. This has been
fixed with a patch by Tom Yan.
* mkvmerge: MPEG 1/2 video handling: the data stored in `Codec private` and
`Codec state` doesn't contain extensions other than sequence & sequence
display extensions anymore. Fix by Tom Yan.
* mkvmerge: tag handling: when remuxing a Matroska file with the
`--no-track-tags`, existing `SOURCE_ID` track tags are now skipped, too.
* MKVToolNix GUI: multiplexer: the drop-down boxes with pre-defined track
names now follow the order set in the preferences instead of sorting the
entries alphabetically. Fixes #2999.
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.
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).
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.