MKVToolNix is the one of the best collection of tools (mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg) for modifying MKV files.
The graphical user interface (GUI) of the program 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 60.0.0 “Are We Copies?” (2021-07-31):
New features and enhancements
- all: IETF BCP 47/RFC 5646 language tags: added support for language families from ISO 639-5 that aren’t part of 639-2.
- all: IETF BCP 47/RFC 5646 language tags: implemented support for Alpha 2 country codes of the “user-defined” category: `AA`, `QM`–`QZ`, `XA`–`XZ` and `ZZ`.
- all: IETF BCP 47/RFC 5646 language tags: updated the various lists of valid subtags from the official specs.
- MKVToolNix GUI: multiplexer: pressing the keyboard shortcut for the track’s “Language” label (Alt+L for English) will now open the language dialog.
- MKVToolNix GUI: multiplexer: added an option in the preferences for turning off the colored boxes indicating which file each track belongs to.
- all: IETF BCP 47/RFC 5646 language tags: fixed validating extended language & variant subtags against their allowed prefixes (e.g. a valid tag with a country code as in `de-CH-1996` is recognized as valid while two generally known variants that aren’t allowed together as in `de-1901-1996` is recognized as invalid).
- all: IETF BCP 47/RFC 5646 language tags: when looking up a language for a two- or three-letter code, the programs will no longer compare that code with language names as that was unintended, ambiguous (e.g. the code “Ga” could be interpreted as the 639-2 alpha-2 code for “Irish” or as the name of the language called “Ga”) and only worked with languages whose name was at most three letters long.
- mkvmerge: HEVC/H.265: appending Matroska files with HEVC tracks might lead to the loss of the first couple of frames from each of the second and all following files.
- mkvmerge, mkvextract: HEVC/H.265 parser: fixed the programs aborting when parsing VPS or SPS NALUs with invalid content due to unhandled exceptions.
- MKVToolNix GUI: multiplexer: when the option “use legacy MIME types for font attachments” is enabled, the GUI will now use `application/x-truetype-font` for font collection files.
- MKVToolNix GUI: multiplexer: fixed escaping the `mkvmerge` argument in the “Show command-line options” dialog for the “Windows (cmd.exe)” mode.
- MKVToolNix GUI: multiplexer: when adding multiple files at once, the GUI will sort file names with numbers the way a human would expect it to. For example, `1.mp4`, `9.aac`, `10.srt`, `11.srt` are now sorted exactly that order instead of `1.mp4`, `10.srt`, `11.srt`, `9.aac`.
- MKVToolNix GUI: header editor: the header editor will now honor the “use legacy MIME types when adding font attachments” setting when adding new attachments.