Thema: MKVToolnix ...

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Changelog

## New features and enhancements

* mkvmerge, mkvpropedit, MKVToolNix GUI: IETF BCP 47 language tags: added
  missing support for UN M.49 regions for which there are no corresponding ISO
  3166 alpha codes. This enables language tags such as `es-419` = Spanish in
  Latin America and the Caribbean. Implements #2919.
* MKVToolNix GUI: IETF BCP 47 language tags: the text in the widget displaying
  the current language & the corresponding edit button is now displayed like a
  link (depending on the theme: different color & underlined), making it
  clearer that not just the edit button can be clicked but the text, too.

## Bug fixes

* mkvmerge: AV1 parser: fixed mkvmerge crashing after uncaught exceptions due
  to certain data conditions. Found by fuzzying.
* mkvmerge: AV1 packetizer: the duration of frames wasn't set properly. When
  appending AV1 IVF or OBU files this meant that the last frame of the Nth
  file and the first frame of file N+1 had the same timestamp. Fixes #2937.
* mkvmerge: DTS reader: fixed handling of buffers with an odd length when
  byte-swapped DTS is detected so that mkvmerge doesn't abort with a failed
  assertion. Found by fuzzying.
* mkvmerge: h.264/AVC and h.265/HEVC elementary stream readers: mkvmerge will
  no longer claim to recognize data that looks like AVC or HEVC but with
  invalid video width/height values as that lead to failed assertions in
  libEBML later. Found by fuzzying.
* mkvmerge: h.265/HEVC parser: fixed mkvmerge aborting after uncaught
  exceptions due to certain data constellations found by fuzzying.
* mkvmerge: IVF reader: fixed mkvmerge crashing with a "division by zero"
  error due to certain data conditions. Found by fuzzying.
* mkvmerge: fixed mkvmerge aborting with a "division by zero" error due to the
  timestamp scaling factor being 0 after handling certain data constellations
  found by fuzzying.
* mkvmerge: track statistics: fixed a "division by zero" error when the
  content's shorter than 1ms. Found by fuzzying.
* mkvmerge, mkvinfo, mkvextract, mkvpropedit: Matroska access class: fixed an
  invalid memory access under certain data conditions. Found by fuzzying.
* MKVToolNix GIU: IETF BCP 47/RFC 5646 language tags: the GUI will no longer
  open the language dialog when clicking on a disabled language display
  widget.
* MKVToolNix GUI: IETF BCP 47 language tags: the "variants" combo-boxes were
  not populated even when the language tag was valid and contained at a
  variant. Fixes #2923.
* MKVToolNix GUI: IETF BCP 47 language tags: when no language is selected, at
  least one of the other components (extended subtags, region, or variants)
  has something selected and "private use" is not empty, the GUI would claim
  this to be a valid tag, which it isn't. Fixes #2924.
* MKVToolNix GUI: multiplexer: when the tracks/chapters/tags selection changes
  from "at least one entry selected" to "no entry selected", the input
  controls will be reset to their default state and not just disabled. Fixes
  #2927.

## Build system changes

* `configure` now checks for the presence of the a system-wide installed copy
  of the JPCRE2 C++ wrapper library for the PCRE2 library and uses that if
  it's new enough (at least v10.32.1). If not, the bundled version will be
  used as a fallback. Implements #2929.

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    New features and enhancements:

    MKVToolNix GUI: job queue: the maximum number of jobs to run concurrently can now be increased in the preferences. The default remains at 1. Implements #2984.
    MKVToolNix GUI: the GUI will now add a context-specific default extension to file names selected for saving on platforms that don't add one itself e.g. GNOME). For example, when saving multiplexer settings the extension mtxcfg` will be added. Implements #2983.
    MKVToolNix GUI: added an option to the preferences for the window to stay on top of other windows. Implements #2967.

    Bug fixes:

    mkvextract: h.265/HEVC extraction: the code for skipping extraction of prefix SEI NALUs in the first frame was skipping two bytes too few, resulting in broken processing of all following bytes. Patch by Mike Chen.
    libEBML: the optional, bundled version of libEBML was updated to v1.4.1.

    Build system changes:

    libEBML v1.4.1 is now required due to a bug in libEBML that caused pointers to just-freed memory being returned to the caller under certain invalid data constellations, causing use-after-free errors in all of MKVToolNix's programs. Fixes #2989.

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    New features and enhancements:

    MKVToolNix GUI: job queue: the maximum number of jobs to run concurrently can now be increased in the preferences. The default remains at 1. Implements #2984.
    MKVToolNix GUI: the GUI will now add a context-specific default extension to file names selected for saving on platforms that don't add one itself e.g. GNOME). For example, when saving multiplexer settings the extension mtxcfg` will be added. Implements #2983.
    MKVToolNix GUI: added an option to the preferences for the window to stay on top of other windows. Implements #2967.

    Bug fixes:

    mkvextract: h.265/HEVC extraction: the code for skipping extraction of prefix SEI NALUs in the first frame was skipping two bytes too few, resulting in broken processing of all following bytes. Patch by Mike Chen.
    libEBML: the optional, bundled version of libEBML was updated to v1.4.1.

    Build system changes:

    libEBML v1.4.1 is now required due to a bug in libEBML that caused pointers to just-freed memory being returned to the caller under certain invalid data constellations, causing use-after-free errors in all of MKVToolNix's programs. Fixes #2989.

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    New features and enhancements:

    mkvmerge: added support for using ISO 639-3 language codes in IETF BF47 language tags. Part of the implementation of #3007.
    mkvmerge: AC-3 parser: added support for byte-swapped AC-3 data. Implements 3022.
    mkvmerge: Matroska reader: for audio tracks that have the bit depth track header set mkvmerge will now keep that header even for codecs that don't require it for decoding. Implements #3009.
    mkvmerge: MPEG transport stream reader, PCM audio tracks: mkvmerge will now re-order the channels for 5.1, 7.0 and 7.1 channel tracks from the Blu-ray layout to the WAVEFORMATEXTENSIBLE layout expected in Matroska. Patch by Tom Yan. Implements #2988.
    mkvmerge, mkvinfo, mkvpropedit, MKVToolNix GUI: added support for the following new track header elements: "hearing impaired" flag, "visual impaired" flag, "text descriptions" flag, "original" flag, "commentary"flag. Implements #3011.
    MKVToolNix GUI: added support for using ISO 639-3 language codes in IETF BF47 language tags. As there are several thousand of them, they're deactivated by default and must be activated in the preferences ("GUI" ? "Often used selections" ? "Languages"). Part of the implementation of #3007.
    MKVToolNix GUI: multiplexer: when adding Blu-rays the user can select multiple playlists to add simultaneously in the "select playlist to add" dialog. Implements #2961.
    MKVToolNix GUI: multiplexer: the file name extensions "eb3" and "ec3" were added for Dolby Digital Plus & "mpl" for Dolby TrueHD in the file dialogs. Part of the implementation of #3027.
    MKVToolNix GUI: multiplexer: when adding multiple files the dialog asking the user what to do with them has gained a new checkbox. If enabled, all files containing at least one video track will always be placed in newly created multiplex setting. Implements #2966.
    MKVToolNix GUI: multiplexer: added a menu entry in the "Multiplexer" for adding all files that are currently in the clipboard. Implements #3006.

    Bug fixes:

    all: Windows: fixed compatibility with gettext 0.21 and newer on mingw.
    all: Windows: fixed several of the programs having problems with certain
    Unicode characters (primarily emojis) in file names (e.g. mkvextract wrongfully complaining about an "invalid mode" or the GUI not being able to find parts of Blu-ray file structures).
    mkvextract: AAC: fixed wrong channel mask field in the ADTS headers for 7.1 channel layouts. Fix by Tom Yan. Fixes #2636.
    mkvextract: h.265/HEVC extraction: if the first frame starts with the parameter sets (SPS, PPS & VPS), the ones from CodecPrivate aren't written and the ones from the first frame are kept. Fixes #3031.
    mkvmerge: fixed the calculation of chapter timestamps read from NTSC DVDs. Fix by Tom Yan.
    MKVToolNix GUI: IETF BCP 47 language widget: the language combo box will now always contain the language code the user enters in the free-form field, even if it isn't in the list of often-used languages the user configured in the preferences.
    MKVToolNix GUI: multiplexer: when browsing for the destination file name the default directory is now chosen according to the preferences regarding how the destination file name should be formed. For example, if the policy is set to "fixed output directory" then that output directory will be the one initially set when the directory selection dialog is opened. Fixes #3021.
    MKVToolNix GUI: multiplexer: fixed the removal of appended source files if the "delete source files" end-of-job action is enabled. Fixes #3029.
    MKVToolNix GUI: chapter editor: when importing chapters from DVDs the IETF BCP 47 language elements will be set, too, not just the legacy language elements.

    Build system changes:

    libEBML v1.4.2 and libMatroska v1.6.3 are now required. The optional, bundled copies of both libraries have been updated to those versions. This bump in requirements fixes several heap overflow bugs in libEBML.
    MKVToolNix is now using the C++17 library feature "file system library" instead of Boost's "file system" and "system" libraries. For the GNU Compiler Collection (gcc) libstdc++ this means v8 or newer is required; for clang's libc++ it means v7 or newer. For macOS this means that provided disk image will only run on 10.15 "Catalina" or newer.

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## Bug fixes

* all programs, only on Windows: fixed checking existence of & creating
  directories with UNC paths such as `\\server\share\folder\file.mkv`. Fixes
  #3041.
* all programs, only on Windows: implemented several workarounds for bugs in
  `std::filesystem` wrt. UNC paths. The effect of those bugs was that Blu-rays
  and DVDs couldn't be added from UNC paths. Fixes #3037.
* mkvmerge, only on Windows: fixed non-ASCII characters getting mangled in the
  destination file name when splitting is active.
* MKVToolNix GUI, only on Windows: fixed the GUI hanging when trying to browse
  for files on drives that don't actually exist. Fixes #3046.
* MKVToolNix GUI, only on Windows: the GUI did not remember UNC paths as the
  "most recently used source directory" properly.
* MKVToolNix GUI: only on Windows: when dragging & dropping files from other
  applications to MKVToolNix GUI the GUI will force the drop action to be a
  copy action, no matter which keys were pressed by the users. This prevents
  Windows Explorer from deleting the dragged file when the user presses shift
  while dropping the file onto MKVToolNix GUI.
* MKVToolNix GUI, only on Windows: when using the file dialog for selecting a
  file name to save to (e.g. when browsing for the destination file name in
  the multiplexer or saving an attachment in the header editor) non-ASCII
  characters in the default file name were mangled. Fixes #3049.
* MKVToolNix GUI: multiplexer: the user can now configure what to do when
  using the "Add source files" button independently of the setting for what
  happens when files are dragged & dropped onto the GUI. The same options are
  available, but they're distinct settings, allowing for different use
  cases. Fixes #3035.
* MKVToolNix GUI: multiplexer: deriving the track language from file names
  doesn't use one big regular expression of all enabled languages
  anymore. Instead, the file name is split into parts on a list of characters
  (such as `.` or `(` and `)`; configurable in the preferences). This prevents
  the regular expression becoming too big for the regular expression library
  to handle when many languages are enabled. Fixes #3048.
* MKVToolNix GUI: preferences: the language lists for "deriving track
  languages" and "enabling items by language" always included all the ISO
  639-3 languages, even if those weren't enabled in the "often-used languages"
  pane. Fixes #3047.

## Other changes

* mkvmerge, MKVToolNix GUI multiplexer: the functionality for changing the
  length of the NALU "size" field for AVC/H.264 and HEVC/H.265 tracks has been
  removed. The corresponding command-line option will continue to be
  recognized by mkvmerge as not to break existing third-party applications,
  but it won't actually do anything.

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## 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. Implements #3062.

## 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. Fixes #3059.
* 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. Part of the
  fix of #3069.
* 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. Part
  of the fix of #3069.
* mkvmerge: tags: when the option `--disable-language-ietf` is used,
  `TagLanguageIETF` elements won't be written. Fixes #3070.
* 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. Fixes #3073.
* mkvmerge: tags: the XML tag parser will now validate all `<Simple>` children
  of `<Tag>` elements, not just the first for each `<Tag>`. Part of the fix of
  #3071.
* mkvmerge: tags: the XML tag parser now uses the spec-compliant `und`
  ("undetermined") as the default language for `<Simple>` tags instead of
  `eng`. Part of the fix of #3071.
* 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`. Fixes #3074.
* 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. Fixes #3034.
* 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). Fixes #3068.
* 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. Fixes #3051.
* 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. Fixes #3072.

## Build system changes

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

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# Version 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.

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## 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). Implements #2784.
* mkvmerge: SRT subtitles: mkvmerge now accepts empty text files with the
  extension `.srt` as SRT subtitle files, enabling the creation of empty SRT
  tracks. Implements #3089.
* 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. Inspired by 3086.

## 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. Part of fixing & implementing #2784, #2818, #3093 and #3113.
* 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. Fixes #3114.
* mkvmerge, mkvextract: HEVC/H.265 parser: fixed issues with ordering &
  duplication of certain NALUs (parameter set & prefix SEI NALUs). Part of
  fixing & implementing of #2784, #2818, #3093 and #3113.
* 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. Fixes #3110.
* 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`.

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## 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.

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## 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.

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Changelog

## 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.

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Changelog

## New features and enhancements

* all: IETF BCP 47/RFC 5646 language tags: implemented support for officially
  registered IANA language tag extensions.
* mkvmerge: track selection: when using language tags for selecting which
  tracks to keep, mkvmerge will now use component-based language tag matching
  instead of comparing them verbatim. This means that only those components
  (language, region etc.) the user specified will be required to exist and be
  equal. For example, if a file contains three subtitle tracks with languages
  `es` (generic Spanish), `es-MX` (Spanish as spoken in Mexico) and `es-ES`
  (Spanish as spoken in Spain), the user can use `--stracks es` to match all
  three tracks or be more specific with e.g. `--stracks es-MX` which would
  only match one track. Similarly inverting the selection with e.g. `--stracks
  !es` would get rid of all three tracks, not just the one for the generic
  Spanish.
* MKVToolNix GUI: multiplexer: deriving track languages from file names: the
  GUI can now detect full BCP 47/RFC 5646 language tags in file names. Part of
  the implementation of #3173.
* MKVToolNix GUI: multiplexer: deriving track languages from file names: the
  default list of boundary characters now includes `-`. Part of the
  implementation of #3173.
* MKVToolNix GUI: multiplexer: the GUI now defaults to the "lower" process
  priority setting for new installations in order to leave more room for other
  applications, especially interactive ones. Up to and including v59 the
  default was the "normal" process priority. v60 changed that to "lowest",
  which turned out to be much slower on Windows for no real gain over
  "lower". The setting will be auto-corrected by the GUI if the settings file
  were saved last with a version between v60.0.0.0 & v60.0.0.17 & "lowest" &
  it is still set to "lowest".
* HEVC dumper development tool: the tool has been renamed to `xvc_dump` and
  extended to be able to dump AVC/H.264 bitstreams, too. It now also detects
  the type of bitstream framing (ISO 14496-15 vs. ITU-T H.264/H.265 Annex B).

## Bug fixes

* all: IETF BCP 47/RFC 5646 language tags: fixed a corner case of wrongfully
  allowing scripts/variants not listed in any of the entries in the prefix
  list when the prefix list contains prefixes restricting scripts/variants and
  a prefix solely with the language at the same time (example: the variant
  `ekavsk` with its prefixes `sr`, `sr-Cyrl` and `sr-Latn` where
  e.g. `sr-ekavsk` and `sr-Cyrl-ekavsk` should be allowed but not
  `sr-Bali-ekavsk`).
* mkvmerge: HEVC/H.265: the frame type of B frames was often wrongfully
  signalled as P frames instead, both with `BlockGroup` (missing second
  references) and `SimpleBlock` ("discardable" flag not set) elements.
* mkvmerge: SSA/ASS packetizer: the frame numbers will now be re-calculated
  when appending SSA/ASS tracks so that frame numbers of appended tracks are
  always strictly higher than frame numbers of the track they're appended to.
* mkvmerge, MKVToolNix GUI's chapter editor: BCP 47/RFC 5646 language tags:
  when BCP 47 language tags are used with a language code that isn't part of
  ISO 639-2, the programs will now write a legacy language element set to
  `und` ("undetermined") instead of not writing such an element at all or
  writing one with an invalid code. Fixes #3174.
* mkvmerge, MKVToolNix GUI's chapter editor: BCP 47/RFC 5646 language tags:
  the programs will ensure that the legacy and IETF language elements written
  will be unique within the scope of the same "chapter display" element.
* mkvinfo, MKVToolNix GUI's info tool: in summary mode the frame type was
  reported wrong for `BlockGroup` elements in which the `ReferenceBlock`
  elements were located behind the `Block` element.

## Build system changes

* all: `std::codecvt_utf8` is now used instead of Boost's
  `utf8_codecvt_facet`. The bundled copy the latter in `lib/boost` has
  therefore been removed.

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Changelog

## New features and enhancements

* all: IETF BCP 47/TFC 5646 language tags: all ISO 639 languages are now
  available, even the ones that aren't of types "Constructed", "Living" or
  "Special".
* mkvmerge, mkvpropedit: chapters: both programs will now write elements set
  to their default value, too (e.g. the legacy language element if it's set to
  `eng`). This is done to be more consistent with how MKVToolNix GUI writes
  chapters. Implements #3210.
* MKVToolNix GUI: multiplexer: when adding new files as attachments the GUI
  checks if there are other attachments with the same name. If so, the GUI
  would ask whether to skip the affected files or add them anyway. There's now
  an option in the preferences to always skip such files, and it's enabled by
  default. Implements #3213.
* MKVToolNix GUI: chapter editor: removed the support for explicitly setting
  the legacy country elements. Instead the legacy country elements are derived
  from the region parts of the IETF BCP 47 languages. Part of the
  implementation of #3193.

## Bug fixes

* mkvmerge: fixed a crash when splitting by chapters is enabled but there are
  no chapters at all. Part of the fix of #3198.
* mkvmerge: the error message when trying to split by a chapter number that
  doesn't exist contained the wrong number of chapters that actually do
  exist. Part of the fix of #3198.
* mkvmerge: AVC ES parser: fixed mkvmerge aborting due to uncaught exception
  when encountering bad SPS data. Part of the fix of #3176.
* mkvmerge: AVC/H.264 parser: re-added the hack `--engage
  all_i_slices_are_key_frames` which was accidentally removed in release v61.
* mkvmerge: AVI reader: fixed a crash trying to allocate too big of a memory
  chunk due to an integer overflows in check conditions. Part of the fix of
  #3176.
* mkvmerge: HEVC ES parser: fixed another issue with frame type
  recognition. Certain frames were marked as B frames/discardable on the
  container level even though they could be reference pictures. Now only SLNR
  pictures (sub-layer non-reference) are marked that way. Fixes #3192.
* mkvmerge: HEVC ES reader: improved file content detection for HEVC ES files
  with wrong file name extensions (e.g. `.mkv`), which fixes them being
  mis-detected as something else, e.g. DTS. Fixes #3201.
* mkvmerge: HEVC ES parser: "end of sequence" NALUs are kept now, and no
  superfluous flushing will be done when one is found. This prevents splitting
  NALUs into two different Matroska blocks when they should really be part of
  a single one, also causing problems with erroneous timestamps. Mostly
  affects DoVi NALUs. Fixes #3202.
* mkvmerge: Matroska reader, TrueHD: mkvmerge will now probe much more TrueHD
  frames trying to find the first sync frame. This fixes track detection in
  situations when a TrueHD doesn't start with a sync frame, e.g. when the
  source file's the result of splitting between sync frames.
* mkvmerge, MKVToolNix GUI's chapter editor: IETF BCP 47/RFC 5646 language
  tags: when reading chapters from MPLS playlist files, the `ChapLanguageIETF`
  element will now be set to the configured default chapter language, not just
  the legacy `ChapterLanguage` element. Part of the fix of #3193.
* mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: IETF BCP 47 elements
  will now always be created before writing chapters unless IETF BCP 47
  elements are disabled. Part of the fix of #3193.
* mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: when a chapter
  display element contains legacy language & country elements but no IETF BCP
  47 elements and IETF BCP 47 elements aren't disabled, the IETF BCP 47
  elements created will contain the region from the legacy element. Part of
  the fix of #3193.
* mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: Legacy country
  elements are now created when IETF BCP 47 elements are present & contain a
  region code allowed in legacy country elements. Part of the fix of #3193.

## Build system changes

* The `tools` sub-directory is now always built. The corresponding `configure`
  option `--with-tools` has been removed. The `install` target still doesn't
  install them, though.

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