MKVToolNix v56.0.0 Final x86/x64 多语言中文正式版-MKV封装工具

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：

# Version 56.0.0 "Strasbourg / St. Denis" 2021-04-05

## 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 `` children
  of `` elements, not just the first for each ``. Part of the fix of
  #3071.
* mkvmerge: tags: the XML tag parser now uses the spec-compliant `und`
  ("undetermined") as the default language for `` 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.

官网地址：https://mkvtoolnix.download

官网更新记录： https://mkvtoolnix.download/doc/NEWS.md

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