MKV 是一种优秀的多媒体容器格式，它可把多种不同编码的视频及16条或以上不同格式的音频和语言不同的字幕封装到一个 MKV 文件中，而 MKVToolNix 是一款免费开源的 MKV 编辑器和工具集，能够合成、编辑 Matroska MKV 文件。

MKVToolNix 包含了以下几个 MKV 专用处理工具：
*mkvmerge：将多媒体文件封装、合并、混流为 MKV 文件；
*mkvinfo：输出 MKV 文件组件和编码信息；
*mkvextract：从 MKV 文件中提取视频、音频和字幕轨道；
*mkvpropedit：直接修改现有 MKV 文件的属性而无需重混流；
*mmg：mkvmerge GUI，并包含了章节编辑器和头部编辑器。

MKVToolNix 中的 Mkvmerge GUI 允许你导入多个视频、音频、字幕轨道，混流合并一个新的 MKV 文件，并可以设置导出视频的宽高比、显示比例、帧频等等。

MKVToolNix 中的 MKVExtractGUI 则可以从现有的 MKV 文件中提取其中的一个或多个视频、音频或者字幕信息，是专业的 MKV 分离工具。

MKVToolNix 是专用的 MKV 剪辑工具，提供了4种 MKV 切割模式，包括按尺寸、按时长、按特定时间码和按分段，都是无损剪辑、分割 MKV 过程，能够同步切割视频、音频和字幕轨道。比之前介绍的所有支持 MKV 分割的工具都要好用，包括 Boilsoft Video Splitter、SolveigMM AVI Trimmer 等。

更新记录：

27.0.0 "Metropolis" 2018-09-26

## New features and enhancements

* mkvmerge: chapters: the timestamps of chapters read from containers or from chapter files can be adjusted (multiplication and addition) with the new `--chapter-sync` option or using the special track ID `-2` for the existing `--sync` option. Part of the implementation of #2358.
* MKVToolNix GUI: multiplexer: adjusted & added controls for mkvmerge's new feature of being able to adjust chapter timestamps. Part of the implementation of #2358.
* MKVToolNix GUI: multiplexer: the GUI can now ask for confirmation when the user is about to create a file that won't contain audio tracks. It does this by default if at least one source file contains an audio track. Implements #2380.

## Bug fixes

* mkvmerge: AC-3: dialog normalization gain removal was corrupting E-AC-3 frames irreversibly by writing checksums in places where they didn't belong. Additionally only the first E-AC-3 frame in a Matroska was processed but not additional dependent frames in the same block. Fixes #2386.
* MKVToolNix GUI: fixed a leak of Windows font resources leading to a general slowdown and subsequent crash. Fixes #2372.

# Version 26.0.0 "In The Game" 2018-08-26

## New features and enhancements

* mkvmerge: chapter generation: if the name template given by
  `--generate-chapters-name-template` is empty, no names (`ChapterDisplay`
  master elements with `ChapterString`/`ChapterLanguage` children) will be
  generated for the chapter atoms. Part of the implementation of #2275.
* mkvmerge: chapters: chapter names generated from MPLS files will now use the
  name template if one is set via `--generate-chapters-name-template`. Part of
  the implementation of #2275.
* mkvmerge: mkvmerge will no longer abort with an error message if no audio,
  video and subtitle tracks should be multiplexed. This allows copying of
  chapters from non-chapter source files (e.g. Matroska or MP4 files).
* MKVToolNix GUI: the font size in the tool selector on the left will scale
  with the font size the user selects in the preferences.
* MKVToolNix GUI: the GUI will no longer automatically resize the columns in
  tree and list views to match the content size. Instead it remembers and
  restores the widths set by the user. Implements #2353.
* MKVToolNix GUI: multiplexer: the chapter name template will now be set
  automatically to the name template in the preferences' "chapter editor"
  section. Additionally the option `--generate-chapters-name-template …` will
  be passed to mkvmerge in situations when mkvmerge will generate chapters
  (either because automatic generation is enabled or if chapters are generated
  for MPLS playlists). Part of the implementation of #2275.
* MKVToolNix GUI: chapter editor: if the chapter name template is empty,
  chapters will be generated without names. Part of the implementation of
  #2275.
* MKVToolNix GUI: chapter editor: added an option to remove all chapter names
  to the "additional modifications" dialog. Part of the implementation of
  #2275.

## Bug fixes

* mkvmerge: Matroska reader: fixed wrong timestamps when appending Matroska
  files where the second Matroska file's first timestamp is bigger
  than 0. Fixes #2345.
* mkvmerge: MP4 reader: fixed division by zero errors during file
  identification if the timescale is 0 in the `MVHD` atom.
* mkvmerge: Windows Television DVR files are now recognized as an unsupported
  file type. This prevents mis-detection as MPEG-2 with an accompanying flood
  of error messages. Fixes #2347.
* MKVToolNix GUI: info tool: under certain circumstances "cues" were shown at
  the wrong level (inside the previous master element instead of on level
  1). Fixes #2361.
* MKVToolNix GUI: job queue: fixed invalid memory handling and consequent
  crashes when using the "edit in corresponding tool & remove from job queue"
  option if one of the files in that job contained attached files. Fixes
  #2368.

## Build system changes

* An AppStream metadata file will be installed in `$prefix/share/metainfo`.


# Version 25.0.0 "Prog Noir" 2018-07-12

## New features and enhancements

* mkvmerge: SRT/ASS/SSA text subtitles: for files for which no encoding has
  been specified, mkvmerge will try UTF-8 first before falling back to the
  system's default encoding. Part of the implementation of #2246.
* mkvmerge: SRT/ASS/SSA/WebVTT text subtitles: a warning is now emitted if
  invalid 8-bit characters are encountered outside valid multi-byte UTF-8
  sequences. Part of the implementation of #2246.
* mkvmerge: Matroska & MPEG transport stream readers: the encoding of text
  subtitles read from Matroska files can now be changed with the
  `--sub-charset` parameter.
* Linux: starting with release 25 an AppImage will be provided which should
  run on any Linux distribution released around the time of CentOS 7/Ubuntu
  14.04 or later.
* macOS: translations: updated the `build.sh` script to build `libiconv` and a
  complete `gettext`. Together with an additional fix to how translation files
  are located, MKVToolNix can now use all interface languages on macOS,
  too. Fixes #2110, #2307, #2323.

## Bug fixes

* mkvmerge: AVC/h.264: fixed file identification failing for certain
  elementary streams due to internal buffers not being cleared properly. Fixes
  #2325.
* mkvmerge: HEVC/h.265: fixed file identification failing for certain
  elementary streams due to internal buffers not being cleared properly. This
  is the HEVC analog to what was fixed for AVC in #2325.
* mkvmerge: MLP code: fixed various issues preventing MLP from being parsed
  correctly. Fixes #2326.
* mkvmerge: TrueHD/MLP packetizer; dialog volume normalization removal isn't
  attempted if the track is an MLP track as the operation is only supported
  for TrueHD, not MLP.
* mkvmerge: MPEG TS reader: when reading MPLS mkvmerge will now compare the
  MPLS's start and end timestamps against the transport stream's PTS instead
  of its DTS. Otherwise the first key frame of a video track might be dropped
  if it isn't the first in presentation order. Fixes #2321.
* mkvmerge: JSON identification: mkvmerge will ensure that all strings passed
  to the JSON output modules are valid UTF-8 encoded strings by replacing
  invalid bytes with placeholder characters. This avoids the JSON library
  throwing an exception and mkvmerge aborting on such data. Fixes #2327.
* mkvmerge: audio packetizers: mkvmerge will now keep discard padding values
  if they're present for packets read from Matroska files. Fixes #2296.
* mkvmerge: Ogg Opus reader: packet timestamps aren't calculated by summing up
  the duration of all packets starting with timestamp 0 anymore. Instead the
  algorithm is based on the Ogg page's granule position and which packet
  number is currently timestamped (special handling for the first and last
  packets in the stream).

  * This fixes the first timestamp if the first Ogg packet's granule position
    is larger than the number of samples in the first packet (= if the first
    sample's timestamp is bigger than 0). mkvmerge will keep those offsets now
    and inserts "discard padding" only where it's actually needed.
  * It also improves handling of invalid files where the first Ogg packet's
    granule position is smaller than the number of samples in the first packet
    (= the first sample's timestamp is smaller than 0). mkvmerge will now
    shift all timestamps up to 0 in such a case instead of inserting "discard
    padding" elements all over the place.
  * mkvmerge will no longer insert "discard padding" elements if the
    difference between a) the calculated number of samples in the packet
    according to the granule position and b) the actual number of samples as
    calculated from the bitstream is one sample or less and if the packet
    isn't the last one in the stream. This circumvents certain rounding
    errors.
  * The timestamp of the first packet after a gap in the middle of the stream
    is now calculated based on the Ogg page the packet belongs to, and not
    based on the timestamps before the gap.

  Fixes #2280.
* mkvmerge: complete rewrite of the progress handling. It's now based upon the
  total size of all source files and the current position within them instead
  of the number of frames/blocks to be processed. This simplifies calculation
  when appending files and fixes rare cases of when progress report was
  obvious wrong (e.g. stuck at 0% right until the end). Fixes #2150 and #2330.
* MKVToolNix GUI: header editor: non-mandatory elements couldn't be removed
  anymore due to a regression while fixing #2320. They can now be removed
  again. Fixes #2322.


# Version 24.0.0 "Beyond The Pale" 2018-06-10

## New features and enhancements

* mkvmerge: MP4 reader: improved the detection of edit lists consisting of two
  identical entries, each spanning the file's duration as given in the movie
  header atom. The second entry is ignored in such cases. See #2306.
* mkvmerge: JSON identification: the "display unit" video track property is
  now reported as `display_unit`. The JSON schema has been bumped to v11 for
  this change.
* mkvmerge, mkvextract: AVC/h.264: empty NALUs will now be removed.
* mkvextract: VobSub extraction: empty SPU packets will now be dropped during
  extraction as other tools such as MP4Box cannot handle them
  correctly. Implements #2293.

## Bug fixes

* mkvmerge: E-AC-3 parser: fixed determining the number of channels for
  streams that contain an AC-3 core with dependent E-AC-3 frames. Fixes #2283.
* mkvmerge: Matroska reader: fixed mkvmerge buffering the whole file if a
  video track is multiplexed that consists of only one or a few frames. Fixes
  #2304.
* mkvmerge: the "display unit" video track property will now be kept if it is
  set in the source file. Fixes #2317.
* MKVToolNix GUI: multiplexer: when scanning playlists, all playlists were
  offered for selection regardless of the value of the "minimum playlist
  duration" setting. Fixes #2299.
* MKVToolNix GUI: multiplexer: deriving track languages from file names: the
  regular sub-expressions for ISO 639-1 codes could match on empty strings,
  too, causing matches in wrong places and hence no language being recognized
  in certain situations. Fixes #2298.
* MKVToolNix GUI: header editor: fixed a crash when saving the file fails
  (e.g. because it isn't writable). Fixes #2319.
* MKVToolNix GUI: header editor: the editor was wrongfully claiming that
  mandatory elements with default values cannot be removed in the "status"
  text. Fixes #2320.
* MKVToolNix GUI: preferences: on macOS & Linux the setting "enable copying
  tracks by their type" wasn't restored on program start. Fixes #2297.

## Other changes

* Niels Lohmann's JSON library: the bundled version has been updated from
  v1.1.0 (git revision 54d3cab) to v3.1.1 (git revision g183390c1).
* pugixml library: the bundled version has been updated from v1.8 to v1.9 (git
  revision e584ea3).


# Version 23.0.0 "The Bride Said No" 2018-05-02

## New features and enhancements

* mkvmerge: input: format detection uses file-extension to improve performance
  and to give preference when several formats match.
* mkvmerge: AV1: added support for reading AV1 video from Open Bitstream Unit
  files.
* mkvmerge: AV1: adjusted the code for the AV1 bitstream format changes made
  up to 2018-05-02 (git revision d14e878).
* mkvmerge: MP4 reader: if a track has an edit list with two identical
  entries, each spanning the file's duration as given in the movie header
  atom, then the second entry will now be ignored. Improves the handling of
  files with bogus data; see #2196 and #2270.
* MKVToolNix GUI: multiplexer: added options to only enable tracks of certain
  types by default. Implements #2271.
* MKVToolNix GUI: multiplexer: added an option to enable dialog normalization
  gain removal by default for all audio tracks for which the operation is
  supported. Implements #2272.
* MKVToolNix GUI: multiplexer: when deriving track languages from the file
  names is active and the file name contains the usual season/episode pattern
  (e.g. "S02E14"), then only the part after the season/episode pattern will be
  used for detecting the language. Part of the improvements for #2267.
* MKVToolNix GUI: multiplexer: the regular expression used for deriving track
  languages from the file names can now be customized in the preferences. Part
  of the improvements for #2267.
* MKVToolNix GUI: multiplexer: the user can now customize the list of track
  languages the GUI recognizes in file names. This list defaults to a handful
  of common languages instead of the full list of supported languages. Part of
  the improvements for #2267.

## Bug fixes

* mkvmerge: MP3 packetizer: removed a memory leak growing linearly with the
  track's size.
* mkvmerge: VobSub packetizer: whenever a VobSub packet doesn't contain a
  duration on the container level, mkvmerge will now set it from the duration
  in the SPU packets. Before it was accidentally setting the SPU-level
  duration to 0 instead. Fixes #2260.
* mkvmerge: track statistics tags: if writing the `Date` element is
  deactivated via `--no-date`, the `_STATISTICS_WRITING_DATE_UTC` isn't
  written either anymore. Fixes #2286.
* mkvmerge, mkvextract, mkvpropedit: removed several small, constant-size
  memory leaks.
* mkvextract: fixed a crash when mkvextract with a non-Matroska file as the
  source file. Fixes #2281.
* MKVToolNix GUI: the central area is now scrollable, allowing the GUI to be
  resized to almost arbitrary sizes. Fixes #2265.
* MKVToolNix GUI: multiplexer: the "copy file title to destination file name"
  functionality will now replace everything in the destination file name up to
  the last period instead of only up to the first period. Fixes #2276.

## Build system changes

* build system: MKVToolNix now requires a compiler that supports the following
  features of the C++14 standard: "user-defined literals for
  `std::string`". For the GNU Compiler Collection (gcc) this means v5.x or
  newer; for clang it means v3.4 or newer.
* Windows: linking against and installing shared version of the libraries with
  MXE is now supported by setting `configure`'s `host` triplet accordingly,
  e.g. `--host=x86_64-w64-mingw32.shared`.

## Other changes

* mkvmerge: AV1: support for AV1 must be activated manually by adding
  `--engage enable_av1` as the AV1 bitstream specification hasn't been
  finalized yet.

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