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：

28.1.0 "Morning Child" 2018-10-23

## Bug fixes

* mkvmerge: AV1 parser: fixed an error in the sequence header parser if neither the `reduced_still_picture_header` nor the `frame_id_numbers_present_flag` is set. Part of the fix for #2410.
* mkvmerge: AV1 parser: when creating the `av1C` structure for the Codec Private element the sequence header OBU wasn't copied completely: its common data (type field & OBU size among others) was missing. Part of the fix for #2410.
* mkvmerge: Matroska reader, AV1: mkvmerge will try to re-create the `av1C` data stored in Codec Private when reading AV1 from Matroska or WebM files created by mkvmerge v28.0.0. Part of the fix for #2410.
* MKVToolNix GUI: info tool: the tool will no longer stop scanning elements when an EBML Void element is found after the first Cluster element. Fixes #2413.

28.0.0 "Voice In My Head" 2018-10-20

## New features and enhancements

* mkvmerge: AV1 parser: updated the code for the finalized AV1 bitstream
  specification. Part of the implementation of #2261.
* mkvmerge: AV1 packetizer: updated the code for the finalized AV1-in-Matroska
  & WebM mapping specification. Part of the implementation of #2261.
* mkvmerge: AV1 support: the `--engage enable_av1` option has been removed
  again. Part of the implementation of #2261.
* mkvmerge: MP4 reader: added support for AV1. Part of the implementation of
  #2261.
* mkvmerge: DTS: implemented dialog normalization gain removal for extension
  substreams. Implements #2377.
* mkvmerge, mkvextract: simple text subtitles: added a workaround for simple
  text subtitle tracks that don't contain a duration. Implements #2397.
* mkvextract: added support for extracting AV1 to IVF. Part of the
  implementation of #2261.
* mkvextract: IVF extractor (AV1, VP8, VP9): precise values will be used for
  the frame rate numerator & denominator header fields for certain well-known
  values of the track's default duration.
* mkvmerge: VP9: mkvmerge will now create codec private data according to the
  VP9 codec mapping described in the WebM specifications. Implements #2379.
* MKVToolNix GUI: automatic scaling for high DPI displays is activated if the
  GUI is compiled with Qt ≥ 5.6.0. Fixes #1996 and #2383.
* MKVToolNix GUI: added a menu item ("Help" → "System information") for
  displaying information about the system MKVToolNix is running on in order to
  make debugging easier.
* MKVToolNix GUI: multiplexer, header editor: the user can enter a list of
  predefined track names in the preferences. She can later select from them in
  "track name" combo box. Implements #2230.


## Bug fixes

* mkvmerge: JSON identification: fixed a bug when removing invalid UTF-8 data
  from strings before they're output as JSON. Fixes #2398.
* mkvmerge: MP4/QuickTime reader: fixed handling of PCM audio with FourCC
  `in24`. Fixes #2391.
* mkvmerge: MPEG transport stream reader, teletext subtitles: the decision
  whether or not to keep frames around in order to potentially merge them with
  the following frame is made sooner. That avoids problems if there are large
  gaps between teletext subtitle frames which could lead to frames being
  interleaved too late. Fixes #2393.
* mkvextract: IVF extractor (AV1, VP8, VP8): the frame rate header fields
  weren't clamped to 16 bits properly causing wrong frame rates to be written
  in certain situations.
* mkvpropedit, MKVToolNix GUI's header editor: fixed file corruption when a
  one-byte space must be covered with a new EBML void element but all
  surrounding elements have a "size length" field that's eight bytes long
  already. Fixes #2406.

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