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 (AAC, FLAC, MP2, MP3, (E)AC3, DTS/DTS-HD, Vorbis, RealAudio) and also most subtitle formats (SRT, PGS/SUP, VobSub, ASS, SSA etc.).

http://portal.globeca.com.au/web/gagise7703

http://www.cide.ca/web/application

http://sodulich.tphcm.gov.vn/web/application

http://imla.ttime.be/web/application

# Version 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.

## Bug fixes

* 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. Fixes #3170.
* mkvmerge, mkvextract: HEVC/H.265 parser: fixed the programs aborting when
  parsing VPS or SPS NALUs with invalid content due to unhandled
  exceptions. Fixes #3162.
* 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. Fixes
  #3164.
* 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.


# Version 59.0.0 "Shining Star" 2021-07-10

## New features and enhancements

* mkvmerge: WebVTT parser: the parser now follows the specs' rules for parsing
  timestamps more closely by being more lenient: it allows arbitrary number of
  spaces & tabs at the start of the line & around the arrow; it allows any
  number of digits for the hours. Part of #3139.
* MKVToolNix GUI: multiplexer: when adding a Blu-ray playlist without scanning
  for other playlists the GUI will now look for disc library information & let
  the user select which one to use if there's more than one entry. Implements
  #3143.
* MKVToolNix GUI: multiplexer: added an option for sorting files & tracks by
  track types when adding them to multiplex settings. The order is: video
  first followed by audio, subtitles and other types. Files & tracks can still
  be reordered manually later. The option is enabled by default & can be found
  in the preferences → "Multiplexer" page → "Adding files" section. Implements
  #2366.
* MKVToolNix GUI: multiplexer: added an option for recognizing file name
  sequences such as `movie.001.mp4`, `movie.002.mp4`, `movie.003.mp4` when
  adding multiple files at once. If a sequence is detected, the only first
  file will be added while the second and following file names will be
  appended to the first one. The option is enabled by default & can be found
  in the preferences → "Multiplexer" page → "Adding files" section. Implements
  #2866.
* MKVToolNix GUI: multiplexer: added small colored boxes for each file & track
  in order to indicate from which file each track is read. The colors used can
  be configured in the preferences → "Multiplexer" page → "File & track
  colors" section.

## Bug fixes

* build system: fixed compilation with fmt v8. Fixes #3151.
* mkvmerge: SRT subtitle reader: characters that aren't valid according to the
  assumed encoding of the file will now be replaced by the Unicode
  "Replacement Character" U+FFFD instead of keeping the invalid characters,
  potentially violating the Matroska specs.
* mkvmerge: WebVTT parser: the parser now accepts timestamps with hours
  larger than 99. Part of #3139.
* mkvextract: TTA extraction, only on Windows: fixed removing the temporary
  file created during extraction.
* mkvmerge, mkvpropedit, MKVToolNix GUI's multiplexer & header editor: MIME
  type detection is now done using Qt instead of the `magic` library. The main
  impact is the MIME types of TrueType & OpenType fonts are now detected
  correctly. Fixes #3137.
* mkvmerge, mkvinfo, MKVToolNix GUI's info tool: only on Windows: displaying
  dates before 1970-01-01 00:00:00 UTC or after 2038-01-19 03:14:08 UTC was
  broken. Note that the header editor was not affected. Fixes #3148.
* MKVToolNix GUI: only on 64-bit Windows: under certain conditions, the 64-bit
  Windows binaries crashed when opening dialog windows. Even though the
  underlying bug hasn't been identified, the investigation showed that
  building it with newer versions than 10.2.0 of the mingw/gcc cross-compiler
  enabled the crashes, while binaries built with 10.2.0 were fine. This
  affected v57 and v58 which were built with gcc versions 10.3.0 and 11.1.0
  respectively. For the time being I've switched back to building Windows
  binaries with gcc 10.2.0. Fixes #3132 & #3133.
* MKVToolNix GUI: multiplexer: when adding files to the multiplexer by running
  the GUI's executable with file names as command line arguments, 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.
* MKVToolNix GUI: multiplexer: the "default track flag" column in the track
  list was missing its icons. Additionally it contained text even for things
  that aren't regular tracks and therefore do not actually have that flag
  (e.g. chapters or tags). Fixes #3144.
* MKVToolNix GUI: multiplexer: the default for the dialog asking the user what
  to do with dragged & dropped files if they've never seen the dialog is back
  to adding the files to the current multiplex settings instead of "add as
  additional parts" which was an unintentional default.
* MKVToolNix GUI: multiplexer: the "show command line" dialog will now always
  use backward slashes for the "Windows (cmd.exe)" mode and forward slashes
  for the "Linux/Unix shells" mode, regardless of the operating system it's
  currently running on. Fixes #3155.

## Build system changes

* The Qt library is now required for building all applications, even the
  command-line ones, as they use Qt's MIME type detection capabilities. In
  turn this means that you cannot disable the Qt usage anymore; either Qt5 or
  Qt 6 is required.

  You can still chose not to build MKVToolNix GUI, though. A new option has
  been added to `configure` for this purpose: `--disable-gui`.
* The `gmp` library is now required.
* The `magic` library is not used anymore.
* The `PCRE2` & `JPCRE2` libraries are not used anymore. The bundled version
  of `JPCRE2` was removed.
* Boost's "rational" library is not used anymore.
* `configure`: the option `--enable-appimage` has been removed. The location
  of the relevant directories within an AppImage is now detected
  automatically.
* The bundled `fmt` library was updated to v8.0.0.


# Version 58.0.0 "Supper's Ready" 2021-06-13

## New features and enhancements

* mkvmerge, MKVToolNix GUI's multiplexer: the handling of the "default track"
  flag has been changed to match the recent changes to the Matroska
  specifications. The new semantics are that if it is set, it is supposed to
  signal to the player that this track is eligible for being played by
  default, potentially taking other factors such as user preferences regarding
  languages into account.

  This implies that more than one track of each type can have this flag
  set. For example, a Blu-ray disc with three audio tracks might have
  the main audio in both English and Japanese, whereas the third audio
  track contains the director's comments. In such a case the first two
  tracks should have the "default track" flag set, the third one
  shouldn't.

  Earlier `mkvmerge` was enforcing that only one track of each type could have
  the flag set. This restriction has been removed, both in `mkvmerge` and in
  the GUI's multiplexer.

  `mkvpropedit` and the GUI's header editor are unaffected as they've always
  allowed to set the flag on as many tracks as the user wanted.
* mkvmerge: AVC/H.264 & HEVC/H.265 identification: added the stream's pixel
  dimensions (AVC only; were present for HEVC already) & default
  duration. Implements #3116.
* mkvmerge, mkvextract: HEVC/H.265: added support for reading single-layer
  Dolby Vision from Annex B type bitstreams (elementary streams, MPEG
  transport streams). Patch by quietvoid. Implements #3113.
* mkvinfo: the option `-X`/`--full-hexdump` now affects all binary elements,
  not just the frame data in `SimpleBlock` and `BlockGroup` elements.
* MKVToolNix GUI: multiplexer: the "delay" and "sync" options can now be used
  for chapters in source files, too. Implements #3129.
* MKVToolNix GUI: when moving list entries up & down with the optional buttons
  or the keyboard shortcuts (instead of using drag & drop), the GUI ensures
  that the top-most selected entry remains visible after the move. Implements
  #3123.
* MKVToolNix GUI: added an option in the preference to use legacy MIME types
  for font attachments instead of the current standard ones
  (e.g. 'application/x-truetype-font' instead of 'font/sfnt' and 'font/ttf').


## Bug fixes

* build system: fixed filtering out optimization options when compiling the
  file `iso639_language_list.cpp` (before only numeric optimization levels
  were filtered out and only if it wasn't the last option in the list of
  flags). See #3105 for context.
* build system: when libmagic was detected via `pkg-config`, MKVToolNix was
  actually compiled without support for libmagic due to a preprocessor symbol
  not being defined.
* mkvmerge: MP4 reader: fixed an issue with timestamps overflowing when the
  file's or the track's time scale is large. Fixes #3124.
* mkvmerge, mkvextract: fixed key frame handling for `BlockGroup` elements
  with a forward reference but no backward references. Patches by Tom Yan.
* mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: the programs will no
  longer omit writing mandatory elements set to their default value if other
  elements of the same type are present in the same master. This affects
  mostly the "chapter language" element which may occur multiple times within
  the same "chapter display" master. If it does occur multiple times and one
  of them is set to "English" (which is that element's default value), that
  element will now be written, too. Part of the fix of #3120.
* mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: when parsing chapter
  files IETF & legacy language elements as well as legacy country elements
  will now be properly generated depending on which exist already, especially
  when there's more than one language and/or country element in a "chapter
  display" element. Part of the fix of #3120.
* mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: fixed reading
  OGM-style chapter files with timestamps that don't have exactly three
  decimal places. Any number of decimal places between one and nine is now
  supported for nanosecond precision. Fixes #3121.
* MKVToolNix GUI: chapter editor: added/fixed support for "chapter display"
  elements with multiple languages or countries. Part of the fix of #3120.

## Build system changes

* Qt 6: added support for building with Qt 6. `configure` will look for Qt 6
  first and only continue looking for Qt 5 if Qt 6 isn't found or disabled via
  `--disable-qt6`.

  Qt 6 detection works by first looking for the `qmake6` binary. Its location
  can be specified with the `--with-qmake6=…` option.

  All other Qt 6 related facts (such as compiler & linker flags or the
  position of the other required tools such as `lconvert`, `moc`, `rcc` and
  `uic`) will be derived from the output generated by `qmake6`.

  Note that at this point Qt 6 is not yet supported for the cross-compilation
  build to Windows, nor is a static Qt 6 build supported yet.

  Note that the command line options `--enable-static-qt`,
  `--with-qt-pkg-config-modules` and `--without-qt-pkg-config` only apply to
  the Qt 5 and have no effect on Qt 6.
* Qt 5: the options for specifying the position of the tools (`--with-moc=…`,
  `--with-rcc=…` and `--with-uic=…`) have been removed. Their position will
  now be derived from the output generated by `qmake`.
* `configure`: completely disabling the GUI now requires passing both
  `--disable-qt6` and `--disable-qt` options.
* Boost's multi-precision library is now required.
* Boost v1.66 or newer is now required.

## Other changes

* The Windows build is now using an updated version of the
  `file`/`magic` library for MIME type detection of attachments. This
  affects fonts whose MIME types will now be the current standard MIME
  types (e.g. `font/sfnt` or `font/ttf` for TrueType fonts). As this
  might pose problematic with older players that only support the
  legacy MIME type (e.g. `application/x-truetype-font`), a new option
  was added in the GUI's preferences to use the legacy MIME types
  instead of the current standard ones. This is off by default.
  Builds for other operating systems have already been using newer
  versions of the `file`/`magic` library for a long time.