The new MKVToolNix is out, with a lot of enhancements in MKVToolNix GUI & several bug fixes in the other parts.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 91.0 “Signs” 2025-03-16

Important notes

• The MKVToolNix project’s source code repository, bug tracker and wiki have been moved to Codeberg.
• The customized MXE repository used for building the Windows variants has been moved from Gitlab to Codeberg.

New features and enhancements

• MKVToolNix GUI: multiplexer: added actions in the “Multiplexer” menu for saving all currently open multiplexer tabs to a single .mtxcfg file. Loading this file later will restore all tabs. Implements #3797.
• MKVToolNix GUI: multiplexer: when adding files the GUI can automatically enable the “commentary” flag for audio and subtitle tracks if the file name contains the word “comments” or “commentary” delimited by certain characters (configurable). This feature is turned on by default. Part of the implementation of #3798.
• MKVToolNix GUI: multiplexer: when adding files the GUI can automatically enable the “original language” flag for audio and subtitle tracks if the track’s language matches one configured by the user (configurable). This feature is turned off by default. Part of the implementation of #3798.
• MKVToolNix GUI: multiplexer: when adding files the GUI can automatically set several track flags based on the file name. It can now look for the same patters in the track names, too (configurable). This feature is turned on by default. Part of the implementation of #3798.
• MKVToolNix GUI: multiplexer: added special drag & drop zones where users can drop files to circumvent the preferences wrt. what to do with multiple dropped files. Each drop zone corresponds to one of the three possible choices (add all to current settings; create one new settings & add all there; add new settings for each file & add one file to each). This feature is turned off by default. Implements #3796.
• MKVToolNix GUI: multiplexer: added additional special drag & drop zones where users can drop files to add them as attachments. One of the zones will automatically set up the dropped file to function as a cover image. Implements #3794.
• MKVToolNix GUI: multiplexer: when making destination file names unique by suffixing them with a running number the GUI will now also consider the destination file names of multiplex jobs currently in the queue that are currently running or still waiting for execution. Implements #3801.

Bug fixes

• mkvmerge: timestamps format v3: fixed the parser; it was completely broken for the lines containing the duration & an optional number of frames per second. Fixes #2285.
• mkvmerge: DTS parser: if the X96 extension is present in a DTS-HD High Resolution stream, the sampling frequency will be set to 96kHz. This was broken when reading DTS from elementary streams & from Matroska files. Fixes #3288.
• mkvpropedit, MKVToolNix GUI’s chapter & header editors: fixed a bug leading to a segmentation fault when trying to replace an element at the end of the file that’s followed by only void elements (at least one). Fixes #3802.

Build system changes

• The bundled nlohmann-json library was updated to v3.11.3.

Here’s a new MKVToolNix release with a handful of bug fixes & enhancements. Nothing major in this one.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 92.0 “Everglow” 2025-04-26

New features and enhancements

• mkvmerge: FLAC reader: pictures embedded into the FLAC file were already handled as attachments, but they were left in the codec initialization data as well. They’re now removed from the codec initialization data. See #6079.
• mkvmerge: FLAC reader: padding metadata blocks will now be removed from the codec initialization data. See #6079.
• mkvmerge: FLAC reader: embedded Vorbis comments will now be converted into Matroska comments or track/global header fields when available (e.g. TITLE will become the segment title & track’s name, LANGUAGE will become the track’s language). Copying of Vorbis comments that are converted into actual Matroska tags can be prevented with the usual options, e.g. --no-track-tags. The comments will also be removed from the codec initialization data. Implements #6079.
• mkvmerge, MKVToolNix GUI’s chapter editor: when reading simple (OGM-style) chapter files & no character set is given for the file, mkvmerge will try UTF-8 first before falling back to the system’s default encoding. Implements #6084.
• MKVToolNix GUI: multiplexer: the special drag & drop zones added in v91 are now shown by default in new installations.
• MKVToolNix GUI: in new installations the main window will now be sized at 75% of the screen’s resolution initially with a certain minimum initial size. This improves initial readability on high DPI screens that use screen scaling factors such as 150%.

Bug fixes

• mkvmerge: Ogg reader: during identification the track tags are now reported properly.
• MKVToolNix GUI: multiplexer: within the “additional options”, both track-specific ones & the global ones on the “Output” tab, it wasn’t possible to specify empty (zero-length) arguments. With the intended syntax of two consecutive single or double quotation marks the empty arguments were simply skipped. This was fixed, and it is now possible to specify e.g. --title "" in the global “Additional options” in order to force no title to be written ever. Fixes #6087.

Build system changes

• Windows build: the packaging/windows/populate_installer_dir.sh now expects the user to pass the Saxon-HE’s JAR file name to be passed with the -s or --saxon-jar parameter instead of the base directory for Saxon-HE. This allows newer versions of Saxon-HE to be used.

Have fun 😁

It’s been a pretty quiet last eight weeks, but let’s do a release anyway. Couple of smaller fixes, nothing major.

An important note to my macOS users:

I’m aware that Apple has announced the upcoming end of their Rosetta x86/x64 emulation layer with macOS 28 (release likely in Autumn 2027). My MKVToolNix binaries are x86/x64 binaries, not ARM ones, therefore this impacts y’all. Unfortunately I do not have an ARM-based mac and do not plan on ever getting one. Therefore I will discountinue offering macOS binaries when Rosetta support ends.

I would very much welcome others to provide macOS ARM binaries in my stead and would gladly link to their efforts from MKVToolNix’ homepage. So far no one has stepped up to do so. The closest you get is probably the Homebrew project which offers MKVToolNix for ARM, too, with the important caveat that they only build the CLI tools, not the GUI. I do not know why; please ask them or offer your help getting their builds to build the GUI, too.

If you want to compile for macOS ARM yourself: good news, this is pretty easy. MKVToolNix contains my scripts that I use for building the x64 binaries, and those same scripts work for ARM macs, too. Please see this forum post for details. There a user & I discuss requirements & small issues they encountered, and the succeeds in building ARM binaries.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 93.0 “Goblu” 2025-06-14

New features and enhancements

• all: updated the various lists that go into IETF/BCP 47 language tags: ISO 639 languages; ISO 3166 countries; ISO 15924 regions; IANA subtag registries.
• translations: added a Hungarian translation of the programs & man pages by Viktor György, John Fowler & Attila Zsigus (see AUTHORS).
• mkvextract: tags extraction: added an option --no-track-tags (short: -T) for not extracting tags associated with tracks.
• MKVToolNix GUI: multiplexer: the default regular expression for deriving the “forced display” track flag from file names for subtitles was extended to also match on the term signs. Implements #6094.
• MKVToolNix GUI: preferences: the revert buttons for the various “default regex for…” will only be enabled when the current text differs from the default, in other words: when reverting would actually change the text. Part of the implementation of #6099.
• MKVToolNix GUI: preferences: the GUI will now auto-upgrade the “default regex for…” to their respective current default values if they’re still set to one of the previous default values. Part of the implementation of #6099.

Have fun 😁

This is probably the smallest release I’ve ever done :) Just one bug fix & one feature. Apart from that a ton of work went into the macOS build scripts in order to be able to build universal binaries. It’s not finished yet, and therefore the work’s not part of the release.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 94.0 “Initiate” 2025-07-27

New features and enhancements

• MKVToolNix GUI: multiplexer: the “delete source files after multiplexing” job runner will now delete both files of an .idx/.sub VobSub file pair. Implements #6133.

Bug fixes

• all: fix compilation without FLAC. Fixes #6128.

Have fun 😁

Time for another release: a couple of new features/enhancements contributed by a kind person, a handful of bug fixes.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 95.0 “Goodbye Stranger” 2025-09-14

New features and enhancements

• mkvmerge, MKVToolNix GUI: new chapter generation feature: a new placeholder has been introduced when generating chapters for appended files, <TITLE>, which will be replaced by the appended file’s title metadata. Implements #6151. Implementation by Jason Donenfeld.
• mkvmerge: the display matrix from MP4 files are now translated into appropriate roll and yaw values for output MKV files. Implements #6150. Implementation by Jason Donenfeld.
• mkvmerge: add --date argument to set the date metadata. Implements #6155. Implementation by Jason Donenfeld.

Bug fixes

• build system: fixed building with the upcoming Boost v1.89.0 by only requiring the header part of the Boost.System library as it’s been header-only since v1.69.0. Fixes #6143.
• mkvmerge: PCM packetizer: mkvmerge will now always write frames with 40ms of samples, no matter how long or short the frames in the source files were. Part of the fix of #6149.
• mkvmerge: MP4/QuickTime reader: fix exorbitant memory usage when reading PCM audio tracks. Part of the fix of #6149.

Build system changes

• Boost v1.74.0 or newer is now required.

Have fun 😁

Here’s the latest, the greatest (maybe?) release of MKVtoolNix, v96.0. Business as usual: couple of enhancements, couple of bug fixes.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 96.0 “It’s My Life” 2025-11-08

New features and enhancements

• all programs: added a command-line parameter --no-bom that disables writing byte order marks to text files encoded with one of the UTF variants. Implements #6166.
• MKVToolNix GUI: multiplexer: added variable <MTX_CHAPTERS_FILE_NAME> to the “run program after job completion” mechanism containing the absolute path to the chapters file name. Implements #6172.

Bug fixes

• mkvmerge: OBU reader: fixed probing files in which the first frame ends after the 1MB mark, which is how big the memory buffer used for probing content is. Fixes #6165.
• mkvmerge: VobSub reader: VobSub .idx files that start with a byte-order mark (BOM) are now read again correctly. Fixes #6162.
• mkvextract: AV1/IVF: fixed inserting a temporal delimiter OBU at the start of each frame if there is none. Mostly fixes #6120.
• mkvextract: AV1/IVF: fixed a potential calculation error when deriving frame rate numerator & denominator from Matroska’s default duration. Part of the fix of #6120.
• mkvextract: AV1/IVF: fixed calculation of IVF frame number calculation from Matroska’s frame timestamps by rounding instead of truncating. Part of the fix of #6120.

Have fun 😁

Happy new year everyone. Here’s v97.0 of MKVToolNix, probably the smallest release I’ve ever done with just two NEWS.md entries. But I like to keep up with my ususal schedule, so here we are. Feel free to skip this release if the feature mentioned below is irrelevant for you.

An important note for macOS users: I will stop providing macOS binaries and any kind of support for macOS in the second half of 2026 due to Apple discontinuing support for the Rosetta x86-to-ARM translation system. As my current build process only works on x86 (Intel) macs this will be the end of the line for any kind of mac support for me.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 97.0 “You Don’t Have A Clue” 2026-01-02

New features and enhancements

• mkvmerge: MP4 reader: added support for TrueHD in MP4 with FourCC mlpa. Implements #6178.
• installer: the Windows installer will request admin permissions again, as it did before release 96.0.

Have fun 😁

MKVToolNix v98 is now out, again just a pretty small release with just a handful of changes — but why hold off even longer? Who knows when things will pick up again. So here we are!

An important reminder for macOS users: I will stop providing macOS binaries and any kind of support for macOS in the second half of 2026 due to Apple discontinuing support for the Rosetta x86-to-ARM translation system. As my current build process only works on x86 (Intel) macs this will be the end of the line for any kind of mac support for me. There is some community support in the form of third-party builds over on the MKVToolNix forum.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 98.0 “Chonks” 2026-04-05

New features and enhancements

• all: huge update to the Japanese translations which had been not worked on for several years. The program translation is now complete again, the man page translation has been extended as well. Both were reworked in most places. Translations by coolvitto.
• GUI: chapter editor: added an option in the “additional modifications” dialog that toggles applying the selected modifications to all currently open chapter editor tabs. Implements #6189.
• GUI: macOS: added dock icon progress bar for job queue. Patch by Miklos Juhasz.

Bug fixes

• GUI: chapter editor: when renumbering chapters limiting the number of chapters to renumber did not work. Fixes #6199.
• GUI: macOS: fixed refreshing widgets after system switches between dark & light modes. Patch by Miklos Juhasz.

Build system changes

• The bundled fmt library was updated to v12.1.0, fixing a build issue on FreeBSD. Fixes #6191.

Have fun 😁

After sleeping over it this is indeed my decision: I will no longer provide macOS binaries starting with yesterday’s release, v98.0.

I’m sorry for the shortened timeline. This was obviously not the plan.

Here’s MKVToolNix v99. There are a couple of bug fixes & improvements in the GUI & in mkvmerge among with a huge amount of fixes/changes/improvements to the macOS build system. Yes, that’s right, macOS binaries are back.

Thanks to the huge amount of work by two community members, corticalcode & touchstone64 (Graham Thompson), we will once again provide macOS binaries (DMGs) for releases v98 (already available for download) and newer (such as this one, v99). Both have improved the macOS build system significantly, implemented building ARM binaries in addition to Intel binaries (this includes a Universal DMG) and fixing bugs they come across while doing so. I’m very grateful for their work, and the MKVToolNix community as a whole is better off.

The macOS DMGs I’ll host on the project’s home page will be built by aforementioned Graham Thompson, not by me. They’re signed & all the good stuff. You can find details about the certificate used on the authenticity page.

You can download the source code or one of the packages. The Windows packages as well as the Linux AppImage are available already. The other Linux packages & the macOS disk image are still being built and will be available over the course of the next couple of hours.

Here are the NEWS since the previous release:

Version 99.0 “Buka” 2026-05-24

New features and enhancements

• MKVToolNix GUI: the GUI will now remember the last used directory for selecting audio files for playback in “play audio file” program runners separately from any other “open file”-type situations. This directory will also default to /System/Library/Sounds on macOS now. Implemented by #6213.
• MKVToolNix GUI: executing actions → running programs: added new variables: MTX_DESTINATION_FILE_BASE_NAME (the name without the drive letter, path or the suffix; e.b. /movies/A.new.hope.mkv → A.new.hope) and MTX_DESTINATION_FILE_SUFFIX (only the letters after the last ., e.g. /movies/A.new.hope.mkv → mkv). Added examples to all the destination file variables in the popup menu when adding variables in the preferences. Implements parts of #6220.
• MKVToolNix GUI: executing actions → running programs: the command-line input widget will now receive focus again after using the popup menu for adding a variable. Implements parts of #6220.
• MKVToolNix GUI: executing actions → running programs: the variables will now also be set as environment variables when running a program after a job completes.
• MKVToolNix GUI: executing actions → running programs: when using the “Execute now” button for testing the MTX_… variables will be set to the current multiplexer tab’s values for easier testing. Implements parts of #6220.

Bug fixes

• mkvmerge: if using legacy font MIME types is off mkvmerge will now remap legacy font MIME types present in source files into the current ones. Patch by corticalcode via #6249.
• mkvmerge, mkvpropedit, MKVToolNix GUI’s multiplexer & header editor: on Windows & macOS the MIME type detection will now use the FreeDesktop.org MIME database instead of falling back to file extension-based guesses. This matches how it works on other operating systems. This fixes e.g. OpenType fonts being detected as the legacy type application/vnd.ms-opentype instead of the current IETF RFC, font/otf, no matter what the “use legacy font MIME types” settings in the preferences was set to. Fixes #6240 for Windows; fixes #6248 for macOS. Implemented by corticalcode for macOS in #6250.
• MKVToolNix GUI: update checker: fixed a potential attempt to read from an invalid memory address if an error occurred when parsing the XML file retrieved from the official MKVToolNix server.
• macOS: GUI: the default audio file for program runners of type “play audio file” has been changed to an AIFF file as Qt’s Multimedia backend routes through Core Audio which doesn’t support WebM/VP8/Vorbis/Opus. Existing configurations will be updated if they point to the prior default WebM audio file. Fixes #6209.

Build system changes

• macOS: build.sh: the Qt installation is now done via cmake --install instead of using classic make as the classic Makefiles produced by Qt’s build system are incomplete. Patch by corticalcode. Fixes #6205.
• macOS: build.sh: the binaries in the DMG are now stripped of debug symbols. Patch by corticalcode. Fixes #6206.
• macOS: build.sh: enabled release build optimizations for dependencies. Patch by corticalcode. Fixes #6207.
• macOS: build.sh: disabled use of pkg-config for Qt to prevent linking against installed non-OS libraries such as from Homebrew. Patch by corticalcode. Fixes #6208.
• macOS: added support for notarization of a macOS disk image by an Apple developer account. Implementation of #6212 by Touchstone64.
• macOS: patch added to make building Qt 6.11 from source possible on macOS 26.4. Patch by Touchstone64.
• macOS: additions to DMG package naming including the machine type it targets (arm64 or x86_64) and a revision number (to support re-packaging of an existing MKVToolnix release). For example, MKVToolNix-98.0-1-arm64.dmg would represent the first revision of a DMG package for an Apple Silicon Mac, containing MKVToolNix release 98.0. Implementation by Touchstone64.
• macOS: the packaging process now verifies the MKVToolNix source release using the author’s GPG key before packaging. Implementation by Touchstone64.
• macOS: the app bundle name has been standardised by removing the version number, so DMG packages will contain ‘MKVToolNix.app’. Implementation by Touchstone64.
• macOS: Qt is now built without printing support, reducing the size of the resulting DMG slightly. Implementation by Corticalcode. Implements #6230.

Have fun 😁