Thema: MKVToolnix ...

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Changelog

## New features and enhancements

* MKVToolNix GUI: the list of often used languages now contains those from
  Wikipedia's "List of languages by native speakers" by default. Also by
  default only those languages will be shown in the language drop-down boxes.

## Bug fixes

* MKVToolNix GUI: multiplexer: fixed a bug in the "make destination file names
  unique" logic that caused an existing number-in-parenthesis at the end of
  the file base name to be removed in certain situations (e.g. when the first
  added file was named `m (3).mkv` and both `m (3) (1).mkv` and `m (3)
  (2).mkv` existed already, the GUI was suddenly use `m.mkv` instead of `m (3)
  (3).mkv`).
* MKVToolNix GUI: on Windows the GUI is built with a slightly older version of
  the Qt library again (5.12.4). The Qt version used in release v36.0.0,
  v5.13.0, lead to crashes when doing certain things such as selecting
  multiple tracks in the multiplexer. Fixes #2605 and #26008.

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    Files now expand when added to list - When you add a file to the list it is now expanded to display the tracks If you want to revert to the previous behaviour, uncheck the option "Automatically expand file items to show tracks" in the Preferences
    Added option to retain output directory - If you want to use the same output directory for all jobs, you can check the new "Save output directory between jobs and sessions" option With this enabled, the output directory will be retained after completing an extraction job and will be restored after restarting the program
    Files can now be removed from list - Individual files can removed from the list by selecting the file(s) and pressing the Delete key
    Aborted tracks are now deleted - Partially extracted tracks, timestamps and cues will now be deleted when you abort the extraction process, as these files would be incomplete and unusable Fully extracted tracks are still left in place after an abort
    Extracted filename format changed - It was pointed out that, if the three letter language code appears immediately before the extension in the filename, MKVToolNix-GUI will read the language code and automatically set the language To take advantage of this feature the language code now appears before the extension
    Fixed issue with TrueHD and E-AC-3 - The extension of extracted Dolby TrueHD and E-AC-3 tracks were set as unknown, but this has now been changed to thd and eac3
    Added some shortcut keys - Ctrl+Shift+B begins extract, Ctrl+Shift+C clears the file list and Ctrl+Shift+O opens the dialog to set the output directory On Mac the shortcuts are Cmd+Shift
    MKVToolNix now included in Linux AppImage - Inviska MKV Extract does not work with the MKVToolNix Snap or AppImage, so some Linux users have had difficulty getting Inviska MKV Extract working To avoid these problems, the MKVToolNix command line tools are included in the Inviska MKV Extract AppImage The latest version of MKVToolNix available at the time of release will be used, which will generally be newer than the version in most distro repositories For example, this release uses MKVToolNix 37, while the version in the Ubuntu 1904 repository is 31, the version in the Ubuntu 1804 repository is 19, and the version in the Ubuntu 1604 repository is 88 Bundling MKVToolNix will therefore result in fewer problems, will increase potability, and will use a more recent version of MKVToolNix than is in the distro repository On the negative side, the AppImage is now 45MB
    Added Spanish translation - Translation by AOCarallo (origionally added in the now deleted verison 101)

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Changelog

## New features and enhancements

* mkvextract: chapters, tags & cue sheets will now be written to standard
  output if no file name is given, same as if `-` is given as the file name.
* MKVToolNix GUI: job queue: added a new setting in the preferences' "job
  queue & job status" section that, when enabled, will cause the GUI to remove
  all output files created by jobs that are either aborted by the user or that
  end in an error. Implements #2614.

## Bug fixes

* all programs: macOS: fixed file access if the file name (including all path
  components) contains any Unicode character where NFC (Normalization Form
  Canonical Composed) and NFD (Normalization Form Canonical Decomposed)
  differ, e.g. German Umlauts. Fixes #2620.
* mkvmerge: when splitting by chapters the user can now split by chapters
  coming from one of the appended files, too. Fixes #2625.
* mkvmerge: AAC reader: fixed reading codec parameters (channels, sample rate)
  if a file starts with garbage that includes valid-but-bogus AAC
  headers. Fixes #2622.
* MKVToolNix GUI: Hebrew was added to the list of often-used languages so that
  it can be selected by default again. Fixes #2610.
* MKVToolNix GUI: when updating the GUI's settings from v37.0.0 or older, the
  GUI checks if the list of often-used languages equals the built-in list from
  v36.0.0. If it does, it will be updated to the built-in list changed in
  v37.0.0. Fixes #2611.

## Build system changes

* Boost's Operators header library is now required.

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Changelog

## New features and enhancements

* mkvmerge: Blu-ray: when reading an MPLS playlist mkvmerge will look up and
  use chapter names from the Blu-ray's "track/chapter names" meta data if it
  exists. Part of the implementation of 2486.
* mkvmerge: MP4 reader: if present, cover art images (the
  `meta.udta.ilist.covr` atom) will be converted into attachments.
* MKVToolNix GUI: multiplexer: when adding a playlist from a Blu-ray disc, the
  disc library meta data will be parsed, and the biggest thumbnail, if
  present, will be added as a new attachment with name `cover.jpg` (extension
  depends on thumbnail's extension). Implements #2644.
* MKVToolNix GUI: multiplexer: when adding a playlist from a Blu-ray disc, the
  title from the disc library meta data will be set as the new file title if
  the disc library meta data contains one & no title has been set yet.
* MKVToolNix GUI: multiplexer: the automatically generated destination file
  name will now be based on the file title if one is set at that point. This
  works in conjunction with the title being said from the Blu-ray disc library
  meta data.
* MKVToolNix GUI: chapter editor: when reading chapters from an MPLS playlist
  the GUI will look up and use chapter names from the Blu-ray's "track/chapter
  names" meta data if it exists. Part of the implementation of 2486.
* MKVToolNix GUI: Windows: added a dark mode that's enabled when Windows 10's
  dark mode is turned on.
* translations: added a Bulgarian translation of the programs & the man pages
  by Симеон Цветков (see `AUTHORS`).

## Bug fixes

* mkvmerge: attachments without a file name won't be ignored anymore. Part of
  the fix of #2642.
* MKVToolNix GUI: header editor: attachments with an empty name element will
  be shown as `<unnamed>` as originally intended. Part of the fix of #2642.
* Linux AppImage: the AppImage will no longer change directories before
  running the desired executable allow the use of relative file names. Fixes
  #2632.

## Build system changes

* MKVToolNix now requires a C++ compiler that supports the following features
  of the C++17 standard: "`[[maybe_unused]]` attribute", "nested namespace
  definition", "structured bindings". For the GNU Compiler Collection (gcc)
  this means v7 or newer; for clang it means v4 or newer.
* Boost 1.60.0 or newer is now required.

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Changelog

## New features and enhancements

* mkvmerge: MP4 reader: added support for BMP covert art images.
* MKVToolNix GUI: multiplexer: added an option to disable deriving the
  destination file name from the file title. Implements #2648.
* MKVToolNix GUI: multiplexer: the content of the "stereoscopy" combo box has
  been simplified making the box's minimum width much smaller, allowing the
  user to resize the GUI's whole window to a much smaller width.
* MKVToolNix GUI: multiplexer: whenever the user changes the "aspect ratio" or
  "display dimensions" controls, the corresponding radio button will be
  activated automatically. Implements #2651.
* MKVToolNix GUI: Windows: added a setting in the preferences to disable the
  GUI's dark color mode even if Windows's app color mode is set to
  dark. Implements #2646.
* MKVToolNix GUI: Windows: replaced the dark mode introduced in v39 with
  another dark mode that's less wasteful with space between widgets.

## Bug fixes

* mkvmerge: MP4 reader: mkvmerge was reading eight bytes too many for cover
  art images. This could cause file identification to fail when the cover art
  was located at the end of the MP4 file. Even if it succeeded, this meant too
  much data present in the attachment. Fixes #2650.
* mkvmerge: MP4 reader: covert art images with unknown image types will be
  skipped instead of treated as JPEG images.

## Build system changes

* Qt 5.9.0 or newer is now required for building MKVToolNix GUI.

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Changelog

    New features and enhancements:

    mkvmerge: Matroska reader: Vorbis tracks: stream comments (aka Vorbis
    comments) will be converted to Matroska attachments (for cover arts) and
    Matroska track tags (for other comments). Additionally the stream comments
    will be removed from Vorbis headers.
    mkvmerge: MP4 reader: added support for reading Opus audio from MP4
    files. Part of the implementation of #2673.
    mkvmerge: MP4 reader: added support for reading VP9 video from MP4
    files. Part of the implementation of #2673.
    mkvmerge: Ogg reader: Vorbis, Opus & VP8 streams: stream comments (aka
    Vorbis comments) will be converted to Matroska attachments (for cover arts)
    and Matroska track tags (for other comments). Additionally the stream
    comments will be removed from Vorbis headers.
    mkvmerge: WAV reader: added support for reading RF64 files.
    MKVToolNix GUI: multiplexer: the list of predefined track names is now split
    up into three lists, one for each track type (audio, video &
    subtitles). Part of the implementation of #2654.
    MKVToolNix GUI: multiplexer: when trying to add thumbnails for a Blu-ray the
    GUI will determine the thumbnail's pixel size from the thumbnail files if
    the XML file doesn't contain that information. This works for JPEG and PNG
    files. Implements #2674.
    MKVToolNix GUI: general: line edits & combo boxes will now have a "clear
    text" button appear whenever they're not empty. Part of the implementation
    of #2654.
    MKVToolNix GUI: update check: the dialog showing the latest news & version
    information states explicitly where the links take the user (the MKVToolNix
    NEWS.md` file and YouTube respectively).

    Bug fixes:

    mkvmerge: Matroska reader: mkvmerge did not copy the codec's private data
    when reading WavPack from Matroska files. Fixes #2685.
    mkvmerge: MPLS handling: re-added caching when using MPLS playlists as input
    files. Fixes #2666.
    mkvmerge: MPEG TS reader: when reading an MPLS playlist, the calculation of
    the minimum timestamp to use for shifting all output timestamps to zero was
    wrong. It was wrongfully considering timestamps from packets it would not
    copy due to the MPLS's timestamp restrictions. This could lead to the first
    timestamps in the output file being quite large, e.g. more than a couple of
    minutes, causing sync problems when multiplexing together with other
    files. Fixes #2670.
    MKVToolNix GUI: multiplexer: the automatic switch between aspect ratio &
    display width/height wasn't reflected in the configuration generated for
    mkvmerge`. The user had to change between the two settings manually. Fixes
    2660.
    MKVToolNix GUI: multiplexer: the progress dialog shown when scanning a
    Blu-ray wasn't closed properly in certain situations. Fixes #2678.
    MKVToolNix GUI: general: the configured font was not applied to a lot of
    controls (e.g. the file & track lists or the menu entries) on application
    startup. Instead the user had to open & close the preferences in order for
    the font to be applied to all controls. Fixes #2671.

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Changelog

## New features and enhancements

* mkvmerge: added an option for creating byte-identical files:
  `--deterministic <seed>`. Part of the implementation of #2698.
* mkvmerge: Matroska reader: mkvmerge will remove the `icpf` atom headers if
  they're present in frames read from Matroska files. Implements #2692.
* mkvmerge: MP4 reader: ALAC tracks: the number of channels, sampling
  frequency and bit depth are now taken from the bitstream in order to fix
  bogus values on the container level. Implements #2714.
* mkvpropedit: when changing track UIDs the referring elements in existing
  chapters & tags will be updated automatically, too. Part of the
  implementation of #2700.
* mkvinfo: when the option `-p`/`--hex-positions` is used, element positions
  will be output regardless of the verbosity level. Part of the implementation
  of #2713.
* mkvinfo: added the option `-P`/`--positions` for showing the position of
  each element in decimal regardless of the verbosity level used. Part of the
  implementation of #2713.
* mkvinfo: added the option `-o`/`--continue` for continuing processing when
  the first cluster is encountered regardless of the verbosity level
  used. Part of the implementation of #2713.
* mkvinfo: added the option `-a`/`--all` for outputting all sub-elements (even
  cues & seek head entries) and not stopping at the first cluster regardless
  of the verbosity level used. Part of the implementation of #2713.
* MKVToolNix GUI: multiplexer: added an option in the preferences for
  disabling adding cover images from Blu-ray discs. Implements #2693.
* MKVToolNix GUI: multiplexer: added mkvmerge's new `--deterministic` option
  in the "additional command-line options" dialog. Part of the implementation
  of #2698.
* MKVToolNix GUI: header editor:: when changing track UIDs the referring
  elements in existing chapters & tags will be updated automatically,
  too. Part of the implementation of #2700.

## Bug fixes

* mkvmerge: HEVC ES parser: fixed a bug in the slice parser calculating the
  size of a field which in turn could have led to the slice's type being read
  wrong. Patch by Torsten Hauska. Fixes #2710.
* mkvmerge: Matroska reader: fixed a segmentation fault when trying to read a
  file that uses header removal compression but no removed bytes are present
  in the track headers. Fixes #2687.
* mkvmerge: MPEG elementary stream parser: fixed an invalid memory access and
  use of uninitialized memory that could happen under certain
  circumstances. Fixes #2690.
* mkvmerge: RealMedia reader: fixed a division by zero when all audio
  timestamps were zero. Fixes #2689.
* mkvmerge: RealMedia reader: fixed an invalid memory access in the video
  frame assembly code triggered by invalid data in the file. Fixes #2691.

## Build system changes

* `std::optional` (C++17 feature) is now used instead of `boost::optional`.
* `std::regex` is now used instead of `boost::regex`.

## Other changes

* New man page translations into French, Italian, Russian and Chinese
  Traditional have been added.

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## New features and enhancements

* MKVToolNix GUI: using one of the command line options `--info`,
  `--edit-headers` or `--edit-chapters` will make the GUI select the
  corresponding tool on startup even if no further file name is
  given. Implements #2723.
* MKVToolNix GUI: multiplexer: added a setting in the preferences for changing
  the location of the MediaInfo executable for when the user accidentally
  selected the wrong one.

## Bug fixes

* mkvmerge: AVC/h.264 parser: the order of the NALUs before each key frame was
  sometimes wrong: mkvmerge wrote SPS & PPS after SEI NALUs. Now SPS & PPS
  NALUs are always written before the other NALUs. Patch by Torsten
  Hauska. Part of the implementation of #2709 and part of the fix of #2250.
* mkvmerge: AVC/h.264 parser: when additional SPS or PPS NALUs (with IDs that
  haven't been seen so far) are found mid-stream, mkvmerge will prepend all
  following key frames with all current valid SPS & PPS NALUs (just like when
  SPS & PPS NALUs are overwritten mid-stream). Part of the fix of #2250.
* mkvmerge: MPEG TS reader: fixed detection of MPEG-1/2 video tracks
  consisting of very few frames. Fixes #2732.
* mkvmerge: Ogg Opus reader: fixed the handling of Ogg Opus streams that
  contain a just one Ogg page (`mkvmerge` aborted with an exception). Fixes
  #2722.
* MKVToolNix GUI: multiplexer: dragging & dropping XML files with chapters or
  tags to the GUI's window was broken in v42. Instead of adding the file names
  to the appropriate input boxes the GUI was running mkvmerge for file
  identification purposes which then failed. Fixes #2718.

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    New features and enhancements:

    MKVToolNix GUI: header editor: the attachments can now be reordered via drag & drop. Implements #2753.

    Bug fixes:

    Mkvmerge: Matroska reader: when encountering certain errors in the track headers such as the codec ID not being present mkvmerge will simply skip those tracks instead of exiting with an error. Fixes #2737.
    MKVToolNix GUI: multiplexer: the "ask before overwriting" functionality did not look for the correct file names when splitting was active. Fixes #2741.

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    New features and enhancements:

    mkvmerge: mkvmerge has never supported appending & splitting FLAC audio tracks. mkvmerge will now emit error messages when the user attempts either instead of continuing and creating invalid FLAC tracks.
    MKVToolNix GUI: added an option in the preferences to turn on eliding text on tab headers. If enabled, tab names will be shortened so that all tab headers fit into the window's width. Implements #2768.
    MKVToolNix GUI: added an option in the preferences to disable all tooltips.
    MKVToolNix GUI: Windows: debug output sent via Qt's to Windows' debugging facility will use a more verbose message format including the application name, making it easier to filter for in SysInternal's "Debug View" utility.
    MKVToolNix GUI: multiplexer: if the file identification fails due to a JSON parser error, the output generated by `mkvmerge` will be output via Qt's debugging facility (viewable with SysInternal's "Debug View" utility on Windows; on other systems it's output on `STDERR`) allowing insight into what's gone wrong.
    MKVToolNix GUI: multiplexer: if an error occurs during file identification, the name of the processed file will be mentioned in the error message.
    MKVToolNix GUI: multiplexer: if an error occurs during identification of multiple files, the GUI will ask the user whether to continue or abort the identification process. Implements #2778.
    MKVToolNix GUI: job queue: added an option in the preferences for removing completed jobs when exiting the program depending on their status. Implements #2769.

    Bug fixes:

    mkvmerge: H.265/HEVC packetizer: fixed changing the NALU size length, it was using the wrong offset into the `hevcC` structure.
    mkvmerge: MP4 reader: fixed calculating the duration of video tracks that only contain a single frame. Fixes #2747.
    mkvmerge: MP4 reader: if there's no frame offset table (`ctts` atom) present for H.265/HEVC video tracks, mkvmerge will determine the timestamp order itself instead of relying on the timestamps in the MP4 being in the presentation order required by Matroska. Fixes #2777.
    mkvpropedit: Windows: mkvpropedit wasn't caching when reading the file to modify, slowing down operations such as adding track statistics tags considerably. Fixes #2761.
    MKVToolNix GUI: multiplexer: when using the title as part of the destination file name (both automatically as well as using the "copy title to destination file name" function) all characters that aren't valid in a file name are replaced by hyphens.
    MKVToolNix GUI: multiplexer: the "copy title to destination file name" function was broken when the "make file name unique" option in the preferences was disabled. In that case the file base name was removed regardless of what the title was set to at the time.
    MKVToolNix GUI: multiplexer: when using the "show command line" menu option on Windows the path to the `mkvmerge` executable was shown with forward slashes instead of backslashes. This is a purely cosmetic fix as Windows supports both forward and backward slashes.
    MKVToolNix GUI: multiplexer: when adding Blu-ray playlists the GUI used to only look for the English version of the disc library information (title & cover images). Now the GUI will present all disc library entries in the "select playlist to add" dialog & let the user chose which one to use (ifany). Fixes #2765.
    MKVToolNix GUI: multiplexer, info tool: fixed the "warn before overwriting" check wrt. jobs creating the same file. Fixes #2758.

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## New features and enhancements

* mkvmerge: when splitting, the placeholder `%c` can be used in the
  destination file name. It'll be replaced by the name of the first chapter in
  the file. Implements #2791.
* mkvmerge: when reading MPLS playlists mkvmerge will include a tag named
  `SOURCE_ID` in the track's statistics tags that conveys the fact that the
  source was a Blu-ray and what the track's ID was in the source
  container. When reading Matroska file existing `SOURCE_ID` tags will be
  kept. The format used is the same format MakeMKV uses. Implements #2774.
* mkvmerge: for audio-only files mkvmerge will now write a cue entry every
  500ms instead of every 2s.
* MKVToolNix GUI: job actions: split up the option "execute when the job
  finishes successfully or with warnings" into two separate options: "…when
  finishes successfully" and "…when exits with warnings". Implements #2798.

## Bug fixes

* mkvmerge: Matroska reader: when regenerating UIDs for chapters mkvmerge will
  now fix referencing tag chapter UID targets to have the same values. Fixes
  #2804.
* mkvmerge: MP4 reader: fixed a crash that could potentially happen while
  trying to identify H.265/HEVC tracks.
* mkvmerge: MP4 reader: when reading H.265/HEVC tracks without a frame offset
  table (`ctts` atom) present, mkvmerge did not parse the `hevcC` structure
  correctly in certain cases, causing no video frames to be output at all or
  the output not being playable. This fixes #2782, a bug introduced in v45.
* mkvmerge: MPLS handling/MPEG TS reader: timestamp restrictions as given in
  an MPLS file were only honored for the first play item, not for subsequent
  play items. For those play items the whole referenced file was always
  copied. Part of the fix of #2789.
* mkvmerge: MPLS handling/MPEG TS reader: under certain circumstances mkvmerge
  copied one frame too many before switching to the next play item. Part of
  the fix of #2789.
* mkvmerge: for audio-only files cues will only be created for I frames
  (important for e.g. TrueHD where decoding can only start on a sync
  frame). Fixes #2790.
* MKVToolNix GUI: fixed a crash that happened when closing the preferences
  after having closed at least one multiplexer tab. Fixes #2785.
* MKVToolNix GUI: macOS: changed the default of the "elide tab header labels"
  feature introduced in v45 from "no" to "yes" to mirror how versions before
  v45 behaved on macOS.

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## New features and enhancements

* mkvmerge: chapters: mkvmerge can now read chapters from DVDs if the user
  specifies the path to a DVD folder structure via the `--chapters …`
  parameter. By default chapters from the first title will be imported. This
  can be changed by append `:<title number>` to the file/directory name in the
  `--chapters …` argument, e.g. `--chapters /srv/dvds/BigBuckBunny/VIDEO_TS:3`
  This feature requires mkvmerge to have been built with the `libdvdread`
  library.  Part of the implementation of #2808.
* mkvmerge: added `--engage append_and_split_flac` that enables mkvmerge to
  append and split FLAC tracks, restoring pre-v45 behavior.  The resulting
  tracks will be broken: the official FLAC tools will not be able to decode
  them and seeking will not work as expected.
* MKVToolNix GUI: multiplexer: added support for mkvmerge's new support for
  reading chapters from DVDs if both have been built with the `libdvdread`
  library. Part of the implementation of #2808.
* MKVToolNix GUI: multiplexer: when deriving languages from file names the GUI
  will now look for simplified language names instead of the full ones
  (e.g. instead of looking for "Greek, Modern (1453-)" it would simply look
  for "Greek").
* MKVToolNix GUI: multiplexer: the options in the "additional command-line
  options" dialog are now sorted alphabetically. Additionally the
  `--append-mode` option has been added as one of the only missing global
  options.
* MKVToolNix GUI: chapter editor: the chapter editor can now read chapters
  from DVDs if MKVToolNix has been build with the `libdvdread` library. Part
  of the implementation of #2808.
* MKVToolNix GUI: header editor: added an option in the preferences for
  displaying all date & time values in UTC instead of the local time
  zone. Implements #2814.

## Bug fixes

* all: fixed a crash when using the `MTX_LOGGER=file` syntax for logging debug
  messages without specifying a file name to log to. It will now log to a file
  called `mkvtoolnix-debug.log` in the system's default temporary directory,
  as initially intended.

## Build system changes

* The [`libdvdread`](https://www.videolan.org/developers/libdvdnav.html)
  library will be used if found via `pkg-config`. If it is found, support for
  reading chapters from DVDs will be enabled in `mkvmerge` and the MKVToolNix
  GUI. Part of the implementation of #2808.
* Boost's Date/Time, Lexical Cast, Range, Range Adaptors, Tri-Bool, Variant
  libraries are not used anymore.
* MKVToolNix now requires a C++ compiler & standard library that support the
  following features of the C++17 standard: "`std::variant`", "`std::gcd`".
  For the GNU Compiler Collection (gcc) this means v7 or newer; for clang it
  means v4 or newer — the same versions required by earlier MKVToolNix
  versions.
* MKVToolNix now requires version 6.1.0 of fmtlib or later for the
  `fmt::to_string` function and bugfixes to the formatting of floating point
  numbers. If a system-wide version is installed that's older, the bundled
  copy will be used.
* The bundled version of fmtlib has been updated to release 6.2.1.

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    New features and enhancements:

    Mkvmerge: AC-3: file identification will report AC-3 tracks encoded in Dolby Surround EX as codec "AC-3 Dolby Surround EX". Implements #2740.
    MKVToolNix GUI: multiplexer: on new installations the GUI will now recognize all known ISO 639-2 language codes in file names by default instead of only the top 100 of languages by native speakers.
    MKVToolNix GUI: multiplexer: on new installations the list of "often used languages" will by default only contain certain agnostic ones ("multiple languages", "no linguistic content", "reserved for local use", "uncoded languages"), "English" and the default user interface language. The "list of spoken languages by native speaks" isn't used anymore. Also implements #2716.
    MKVToolNix GUI: header editor: added an option to remove all attachments to the tree context menu. Implements #2835.
    MKVToolNix GUI: while the GUI is running it will remember the last page that was selected when the preferences dialog is closed. Upon re-opening the preferences that page will be selected by default. Implements #2852.

    Bug fixes:

    Mkvmerge: fixed a segmentation fault when exiting prematurely due to write errors such as the destination having run out of space. Fixes #2843.
    Mkvmerge: DTS: fixed wrong channel count for DTS tracks with XCh extensions. Fixes #2715.
    Mkvmerge: MPEG TS reader: fixed detecting h.264/AVC and h.265/HEVC tracks that consist of only a single frame. Part of the fix of #2849.
    Mkvmerge: MPEG TS reader: fixed handling of unbounded PES sizes for tracks that consist of only a single PES packet. Part of the fix of #2849.
    Mkvmerge: MPEG TS reader: PGS subtitle tracks are now exempt from the "detect bogus subtitle timestamps" heuristic which could lead to some PGS subtitles not being timestamped correctly. Symptoms were that they were shown at the wrong time or that they were shown indefinitely. Fixes #2736 and partially fixes #2824.
    Mkvmerge: MPEG TS reader: when reading MPLS playlists the start timestamps of a play items were handled wrong: all the timestamps of packets read were compared to that start timestamp, dropping those packets whose timestamps were smaller than the play item's start timestamp. The correct behavior is to accept all packets as soon as the first one with a timestamp equal to or larger than the play item's start timestamp is encountered. This could result in PGS subtitle entries located right at the start of the play item being garbled/lost as they consist of multiple PES packets for which some timestamps are often slightly smaller. Part of the fix of #2824.
    Mkvmerge: MPEG TS reader: when reading MPLS playlists mkvmerge will no longer read the whole M2TS files they reference, processing only the packets lying inside the timestamp range given by the playlists's play item's start & end timestamps. Instead mkvmerge will use the index information present in corresponding clip information (CLPI) files in order to seek to the nearest file position of the play item's start timestamp. Additionally mkvmerge will simply stop processing a file once the end timestamp is seen. This change greatly speeds up processing files from which only small portions must be read. Part of the fix of #2824.
    Mkvmerge: WavPack: fixed support for files created by v5 of the program. Checksums, DSD audio data and non-standard sampling rates are handled correctly. Patch by David Bryant.
    MKVToolNix GUI: multiplexer: fixed the cursor being positioned wrong after entering or pasting characters that aren't allowed in file names into the "destination file" control. Fixes #2855.

    Build system changes:

    LibEBML v1.4.0 and libMatroska v1.6.0 are now required.

    Other changes:

    The source code repository's main development branch was renamed to `main`.

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Changelog

## New features and enhancements

* mkvmerge: added support for copying the new track header elements
  `BlockAddIDName`, `BlockAddIDType`, `BlockAddIDValue` and
  `BlockAddIDExtraData` from Matroska files if they exist. Part of the
  implementation of #2887.
* mkvinfo: added support for the new track header elements
  `BlockAdditionMapping`, `BlockAddIDName`, BlockAddIDType`, `BlockAddIDValue`
  and `BlockAddIDExtraData`. Part of the implementation of #2887.
* MKVToolNix GUI: multiplexer: the list of recent directories can now be
  edited in the preferences → "Multiplexer" → "Destination file
  name". Implements #2861.
* MKVToolNix GUI: preferences: the values in the various "predefined values"
  lists can now be re-ordered freely by dragging & dropping.

## Bug fixes

* mkvmerge: Matroska reader: when reading tracks (e.g. a subtitle track) from
  Matroska files with their `default track` flag set to `yes`, and when
  overwriting those via the command line to `no`, `mkvmerge` would not promote
  additional tracks of the same type from other files (e.g. another subtitle
  track from an SRT file). Fixes #2863.
* mkvmerge: SRT reader: empty lines inside entries were doubled. Fixes #2888.
* mkvmerge: subtitles: when calculating the rounded duration of each entry the
  error from rounding the corresponding timestamp will be taken into
  account. Fixes #2890.
* mkvextract: SSA/ASS extraction: mkvextract is no longer inserting empty
  lines before the `Dialogue:` lines. Fixes #2876.
* mkvextract: USF subtitles: start & end timestamps were too high by a factor
  of 1.000.000. Fixes #2875.
* MKVToolNix: info tool: when saving to a text file the checkbox "Save as
  default for saving output to text files" did nothing. Fixes #2869.
* MKVToolNix: info tool: when saving to a text file in "all elements in a
  tree-like structure" mode, the GUI always stopped at the first cluster
  regardless of the setting of the "verbosity" option.
* MKVToolNix GUI: preferences: when tooltips were disabled the dialogs for
  adding new entries to the various "predefined values" lists were missing
  their texts.
* Windows installer: the images are shown again. Fixes #2868.
* configure: fixed detection of QtDBus. Fixes #2886.

## Build system changes

* libMatroska v1.6.1 is now required. The bundled version has been updated to
  that version.

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Changelog

    New feature: IETF BCP 47 language tags:

    I've written up a [nice FAQ entry](https://gitlab.com/mbunkus/mkvtoolnix/-/wikis/Languages-in-Matroska-and-MKVToolNix) about the switch to using IETF BCP 47 language tags, how they interact with legacy language elements, how the programs actually behave and how to disable their use if necessary.
    mkvmerge: IETF BCP 47/RFC 5646 language tags: mkvmerge will now accept full BCP 47 language tags for all options taking a language. mkvmerge will always write "LanguageIETF" track header elements. If the language tag contains a valid ISO 639-2 language code it will also set the legacy "Language" track header element to the included ISO 639-2 code. Part of the implementation of#2419.
    mkvmerge: IETF BCP 47/RFC 5646 language tags: if present the "LanguageIETF" track header element will be reported as the`language_ietf` property in JSON identification mode. Part of the implementation of #2419.
    mkvmerge: IETF BCP 47/RFC 5646 language tags in chapters: mkvmerge will now write "ChapLanguageIETF" elements when creating chapter atoms, either when reading the simple chapter format or when generating chapters due to the `--generate-chapters` command line option. Part of the implementation of #2419.
    mkvmerge: IETF BCP 47/RFC 5646 language tags in tags: mkvmerge will now write "TagLanguageIETF" elements when creating "simple tag" elements, either when reading tag XML files or when generating them. Part of the implementation of #2419.
    mkvmerge: IETF BCP 47/RFC 5646 language tags: added an option `--disable-language-ietf` that causes mkvmerge to only write the legacy language elements.
    mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: IETF BCP 47/RFC 5646 language tags in chapters: when reading XML chapter files the programs will now add "ChapLanguageIETF" elements for atoms that don't contain them. The values are derived from existing "ChapterLanguage" elements. Part of the implementation of #2419.
    mkvpropedit: IETF BCP 47/RFC 5646 language tags: setting/deleting the track language now acts on both the old language element as well as the "LanguageIETF" track header element. Part of the implementation of #2419.
    mkvpropedit: IETF BCP 47/RFC 5646 language tags: added an option`--disable-language-ietf` that causes mkvpropedit to apply changes to the`language` track header property only to the legacy language track header element.
    mkvinfo: IETF BCP 47/RFC 5646 language tags: added support for the "LanguageIETF" track header element. Part of the implementation of #2419.
    MKVToolNix GUI: multiplexer: added full support for IETF BCP 47/RFC 5646 language tags for both track and chapter languages. Part of the implementation of #2419.
    MKVToolNix GUI: chapter: added full support for IETF BCP 47/RFC 5646 language tags for chapter languages. Part of the implementation of #2419.
    MKVToolNix GUI: header editor: added full support for IETF BCP 47/RFC 5646 language tags for track header languages. The header editor allows editing of the legacy language elements and the IETF BCP 47 language elements independent of each other. Part of the implementation of #2419.

    Other new features and enhancements:

    mkvmerge: the chapter generation mode `when-appending` now also works with the splitting modes `parts:` & `parts-frames:` when using the `…,+…` syntax for appending other sections of the source file to the same destination file. Implements #2898.
    MKVToolNix GUI: multiplexer: the file selection dialogs now include the extension `.dtsma` for DTS files. Implements #2901.
    mkvmerge: MP4 reader: sped up parsing MP4 DASH files with a lot of segments (`trun` atoms) quite a bit. Part of the fix of #2900.
    The PCRE2 regular expression library is now used instead of `std::regex` for big performance improvements in all places where regular expressions are used for parsing big chunks of text, e.g. in the subtitle parsers. Part of the fix of #2899.
    all programs: Windows: all programs now support long file names on Windows 10 release 1604 if they're turned on in the registry. Implements #2916.

    Bug fixes:

    MKVToolNix GUI: preferences: under certain conditions changing the selected entry in the page tree on the left did not cause the page shown on the right to be updated. Fixes #2895.
    mkvmerge: splitting text by a fixed string (e.g. `,`) is now done by using `std::string.find()` instead of using a regular-expression-based text splitting function, greatly improving its performance. Part of the fix of #2899.
    mkvmerge: mkvmerge will now read-buffer file I/O when probing text file formats which increases its speed significantly on Windows. Part of the fix of #2899.
    mkvmerge: MP4 reader: fixed handling of `tkhd` atoms of version 1. Fixes #2900.

    Build system changes:

    The PCRE2 library (the 8-bit variant) is now required.

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