This update for mkvtoolnix fixes the following issues:

mkvtoolnix was updated to version 59.0.0 (fixes boo#1188209)

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.
  * 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.
  * 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.
  * 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.
  * 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.
  * 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.
  * 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).
  * 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.
  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.
- Use system version of utfcpp

- Update to version 58.0.0
  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.
  * mkvmerge, mkvextract: HEVC/H.265: added support for reading
    single-layer Dolby Vision from Annex B type bitstreams
    (elementary streams, MPEG transport streams).
  * 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.
  * 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.
  * 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).
  * 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.
  * mkvmerge, mkvextract: fixed key frame handling for
    `BlockGroup` elements with a forward reference but no
    backward references.
  * 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.
  * 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.
  * 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.
  * MKVToolNix GUI: chapter editor: added/fixed support for
    "chapter display" elements with multiple languages or
    countries.
  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.

- Up date to version 57.0.0
  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`.