# Change Log
# Version 48.0.0 "Sick Of Losing Soulmates" 2020-06-27
## New features and enhancements
* mkvmerge: AC-3: file identification will report AC-3 tracks encoded in Dolby
Surround EX as codec "AC-3 Dolby Surround EX". Implements #2740.
* MKVToolNix GUI: multiplexer: on new installations the GUI will now recognize
all known ISO 639-2 language codes in file names by default instead of only
the top 100 of languages by native speakers.
* MKVToolNix GUI: multiplexer: on new installations the list of "often used
languages" will by default only contain certain agnostic ones ("multiple
languages", "no linguistic content", "reserved for local use", "uncoded
languages"), "English" and the default user interface language. The "list of
spoken languages by native speaks" isn't used anymore. Also implements #2716.
* MKVToolNix GUI: header editor: added an option to remove all attachments to
the tree context menu. Implements #2835.
* MKVToolNix GUI: while the GUI is running it will remember the last page that
was selected when the preferences dialog is closed. Upon re-opening the
preferences that page will be selected by default. Implements #2852.
## Bug fixes
* mkvmerge: fixed a segmentation fault when exiting prematurely due to write
errors such as the destination having run out of space. Fixes #2843.
* mkvmerge: DTS: fixed wrong channel count for DTS tracks with XCh
extensions. Fixes #2715.
* mkvmerge: MPEG TS reader: fixed detecting h.264/AVC and h.265/HEVC tracks
that consist of only a single frame. Part of the fix of #2849.
* mkvmerge: MPEG TS reader: fixed handling of unbounded PES sizes for tracks
that consist of only a single PES packet. Part of the fix of #2849.
* mkvmerge: MPEG TS reader: PGS subtitle tracks are now exempt from the
"detect bogus subtitle timestamps" heuristic which could lead to some PGS
subtitles not being timestamped correctly. Symptoms were that they were
shown at the wrong time or that they were shown indefinitely. Fixes #2736
and partially fixes #2824.
* mkvmerge: MPEG TS reader: when reading MPLS playlists the start timestamps
of a play items were handled wrong: all the timestamps of packets read were
compared to that start timestamp, dropping those packets whose timestamps
were smaller than the play item's start timestamp. The correct behavior is
to accept all packets as soon as the first one with a timestamp equal to or
larger than the play item's start timestamp is encountered. This could
result in PGS subtitle entries located right at the start of the play item
being garbled/lost as they consist of multiple PES packets for which some
timestamps are often slightly smaller. Part of the fix of #2824.
* mkvmerge: MPEG TS reader: when reading MPLS playlists mkvmerge will no
longer read the whole M2TS files they reference, processing only the packets
lying inside the timestamp range given by the playlists's play item's start
& end timestamps. Instead mkvmerge will use the index information present in
corresponding clip information (CLPI) files in order to seek to the nearest
file position of the play item's start timestamp. Additionally mkvmerge will
simply stop processing a file once the end timestamp is seen. This change
greatly speeds up processing files from which only small portions must be
read. Part of the fix of #2824.
* mkvmerge: WavPack: fixed support for files created by v5 of the
program. Checksums, DSD audio data and non-standard sampling rates are
handled correctly. Patch by David Bryant.
* MKVToolNix GUI: multiplexer: fixed the cursor being positioned wrong after
entering or pasting characters that aren't allowed in file names into the
"destination file" control. Fixes #2855.
## Build system changes
* libEBML v1.4.0 and libMatroska v1.6.0 are now required.
## Other changes
* The source code repository's main development branch was renamed to `main`.
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.