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MKVToolnix 58.0.0 “Supper’s Ready”

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MKVToolnix 58.0.0 “Supper’s Ready”

MKVToolNix is the one of the best collection of tools (mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg) for modifying MKV files.

With these tools one can get information about (via mkvinfo) Matroska files, extract tracks/data from (via mkvextract) Matroska files and create (via mkvmerge) Matroska files from other media files. Matroska is a new multimedia file format aiming to become THE new container format for the future. You can find more information about it and its underlying technology, the Extensible Binary Meta Language (EBML), at

The graphical user interface (GUI) allows you to manipulate Matroska (MKV) files in several ways. You can use those tools to create, split, edit, mux, demux, merge, extract or inspect Matroska files.

MKVToolnix will also work with other video formats. Such as AVI, MPEG, MP4, MPEG, Ogg/OGM, RealVideo, MPEG1/2, H264/AVC, Dirac, VC1.

And more as well as some video codecs such as VP9 video codec support – reading from IVF, Matroska, WebM files, extract to IVF files.

Moreover the program can work with audio files such as AAC, FLAC, MP2, MP3, AC3, DTS/DTS-HD, Vorbis, RealAudio. And also work with most subtitle formats including SRT, PGS/ SUP, VobSub, ASS, and SSA.

It is a cross-platform application that will work on Microsoft Windows (both 32 and 64-bit versions), Apple macOS and Linux operating systems.

Here is also the portable version which does not require installation. You just need to start the function. It can also be stored on external devices and run on any computer you have access to.

Changes in MKVToolnix 58.0.0 “Supper’s Ready” (2021-06-13):

Changes in MKVToolnix 57.0.0 “Till The End” (2021-05-22):

New features and enhancements

  • mkvmerge: MP4 reader: added support for reading Dolby Vision from MP4 files (FourCCs `dvh1` and `dvhe`; configuration records `dvcC`, `dvvC` and `hvcE` will be converted into block addition mappings).
  • mkvmerge: SRT subtitles: mkvmerge now accepts empty text files with the extension `.srt` as SRT subtitle files, enabling the creation of empty SRT tracks.
  • mkvmerge, mkvextract: HEVC/H.265: access unit delimiter NALUs will no longer be discarded, neither during muxing nor during extraction.
  • MKVToolNix GUI: preferences: switched the order & wording of controls in the “enabling items” panel to make it clearer that certain controls define exceptions.

Bug fixes

  • mkvmerge: HEVC/H.265 parser: several NALU types, notably the Dolby Vision-specific NALUs (“unspecified 62” and “unspecified 63”) and suffix SEI NALUs, are now stored with the frame they belong to instead of with the next frame.
  • mkvmerge: HEVC/H.265 packetizer: fixed setting the track’s default duration when reading HEVC/H.265 from Matroska files that don’t have a default duration set.
  • mkvmerge: HEVC/H.265 packetizer: fixed the calculation of the duration of frames so that `SimpleBlock` elements can be used again instead of `BlockGroups` with `BlockDuration` elements.
  • mkvmerge, mkvextract: HEVC/H.265 parser: fixed issues with ordering & duplication of certain NALUs (parameter set & prefix SEI NALUs).
  • MKVToolNix GUI: multiplexer: when dragging & dropping files to the multiplexer, the source directory will be remembered as the “last open
    directory” again, causing subsequent uses of the “open file” dialog to start in the same directory.
  • mkvinfo: fixed the position of frames in block groups containing “block duration” elements in summary mode (e.g. for subtitle tracks).

Build system changes

  • `configure` will now try to detect `libmagic` via `pkg-config` and fall back to including & linking directly if it cannot be found via `pkg-config`.

Changes in MKVToolnix 56.1.0 “My Friend” (2021-04-09):

New features and enhancements

  • mkvmerge: AAC: added support for LOAS/LATM files with channel configuration indexes 9–21 (e.g. channel count 22.2 for index 13) according to Rec. ITU-R BS.1196-7 & ISO/IEC 23008-3:2019. Fixes #3081.

Bug fixes

  • mkvmerge: HEVC/H.265 parser: fixed invalid memory access that could happen when reading certain types of HEVC data (e.g. with changing parameter sets mid-stream) from certain containers (e.g. Matroska). This bug was introduced in release 56.0.0. Fixes #3083.
  • mkvextract: AAC: mkvextract will now abort with an useful error message when the user tries to extract a track whose ‘audio-specific config’ element in `CodecPrivate` signals a number of channels of 7 or greater than 8 as that isn’t supported by the ADTS format.

Build system changes

  • configure: the `–enable-ubsan` option hasn’t actually enabled anything since release 39.0.0.

Changes in MKVToolnix 56.0.0 “Strasbourg / St. Denis” (2021-04-05):

New features and enhancements

  • mkvmerge, mkvpropedit: tags: the programs will no longer write tag elements that are mandatory and set to their default value (e.g. “tag language” set to `und` = undetermined).
  • mkvmerge, mkvpropedit, MKVToolNix GUI chapter editor: chapters: the programs will no longer write chapter elements that are mandatory and set to their default value (e.g. “chapter language” set to `eng` = English or “Chapter flag enabled” = 1).
  • mkvextract: chapters: mkvextract will no longer add a `ChapterLanguage` element set to `eng` to the generated XML content if the source file doesn’t contain such an element.
  • MKVToolNix GUI: multiplexer: when using the “tab widget below the files & tracks” layout option for the track properties the elements in the “general options” tab will use six rows à four columns instead of twelve rows à two columns, greatly reducing the required height.

Bug fixes

  • mkvmerge: AAC reader: fixed mkvmerge aborting to read AAC files bigger than 2 GB with a message about not being able to allocate memory.
  • mkvmerge: chapters: `ChapLanguageIETF` elements were still created when the option `–disable-language-ietf` was given after an option leading to the creation of chapters. Now the position doesn’t matter anymore.
  • mkvmerge: chapters: when the option `–disable-language-ietf` is used, `ChapLanguageIETF` elements won’t be written even when sources are read (Matroska files or XML chapters files) that do contain those elements.
  • mkvmerge: tags: when the option `–disable-language-ietf` is used, `TagLanguageIETF` elements won’t be written.
  • mkvmerge: tags: mkvmerge will no longer write language elements for the track statistics tags it creates, making the effective language “undetermined” due to `und` being the default value for the legacy tag language element.
  • mkvmerge: tags: the XML tag parser will now validate all “ children of “ elements, not just the first for each “.
  • mkvmerge: tags: the XML tag parser now uses the spec-compliant `und` (“undetermined”) as the default language for “ tags instead of `eng`.
  • mkvmerge, mkvpropedit: tags: mkvmerge will no longer set the “target type” for track statistics tags (earlier it used `MOVIE`). The “target type value” will still be set to `50`.
  • mkvmerge, mkvextract: HEVC/H.265: both programs will now normalize the placement of VPS, SPS and PPS NALUs. Each key frame is prefixed with exactly one copy of the currently active parameter sets. This fixes certain classes of bugs related to splitting/appending.
  • mkvinfo: when compiled with newer versions of the `fmt` library, certain numbers were not output correctly (e.g. a track’s audio sampling frequency of 48000 might be output as 48).
  • MKVToolNix GUI: multiplexer: deriving the track language from the file name will match languages case insensitively again (like versions prior to v55).
  • MKVToolNix GUI: multiplexer: under certain circumstances keyboard shortcuts such as `Ctrl+W` for closing the active tab or `Ctrl+R` for starting to multiplex ceased to work until the user did certain other things (such as switching to a different tool & back to the multiplexer or opening the multiplexer menu). This started with v54.
  • MKVToolNix GUI: chapter editor: the editor will no longer create empty `ChapterCountry` elements when adding a chapter name with no default country selected in the preferences.

Build system changes

  • The bundled `fmt` library was updated to v7.1.3.

Homepage –

Works on Microsoft Windows (both 32 and 64-bit versions), Apple macOS and Linux operating systems.

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