MKVToolNix v54.0.0 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 54.0.0 "F Maj Pixie" 2021-02-26

## New features and enhancements

* mkvmerge: added support for using ISO 639-3 language codes in IETF BF47
  language tags. Part of the implementation of #3007.
* mkvmerge: AC-3 parser: added support for byte-swapped AC-3 data. Implements
  #3022.
* mkvmerge: Matroska reader: for audio tracks that have the bit depth track
  header set mkvmerge will now keep that header even for codecs that don't
  require it for decoding. Implements #3009.
* mkvmerge: MPEG transport stream reader, PCM audio tracks: mkvmerge will now
  re-order the channels for 5.1, 7.0 and 7.1 channel tracks from the Blu-ray
  layout to the WAVEFORMATEXTENSIBLE layout expected in Matroska. Patch by Tom
  Yan. Implements #2988.
* mkvmerge, mkvinfo, mkvpropedit, MKVToolNix GUI: added support for the
  following new track header elements: "hearing impaired" flag, "visual
  impaired" flag, "text descriptions" flag, "original" flag, "commentary"
  flag. Implements #3011.
* MKVToolNix GUI: added support for using ISO 639-3 language codes in IETF
  BF47 language tags. As there are several thousand of them, they're
  deactivated by default and must be activated in the preferences ("GUI" →
  "Often used selections" → "Languages"). Part of the implementation of #3007.
* MKVToolNix GUI: multiplexer: when adding Blu-rays the user can select
  multiple playlists to add simultaneously in the "select playlist to add"
  dialog. Implements #2961.
* MKVToolNix GUI: multiplexer: the file name extensions "eb3" and "ec3" were
  added for Dolby Digital Plus & "mpl" for Dolby TrueHD in the file
  dialogs. Part of the implementation of #3027.
* MKVToolNix GUI: multiplexer: when adding multiple files the dialog asking
  the user what to do with them has gained a new checkbox. If enabled, all
  files containing at least one video track will always be placed in newly
  created multiplex setting. Implements #2966.
* MKVToolNix GUI: multiplexer: added a menu entry in the "Multiplexer" for
  adding all files that are currently in the clipboard. Implements #3006.

## Bug fixes

* all: Windows: fixed compatibility with gettext 0.21 and newer on mingw.
* all: Windows: fixed several of the programs having problems with certain
  Unicode characters (primarily emojis) in file names (e.g. mkvextract
  wrongfully complaining about an "invalid mode" or the GUI not being able to
  find parts of Blu-ray file structures).
* mkvextract: AAC: fixed wrong channel mask field in the ADTS headers for 7.1
  channel layouts. Fix by Tom Yan. Fixes #2636.
* mkvextract: h.265/HEVC extraction: if the first frame starts with the
  parameter sets (SPS, PPS & VPS), the ones from CodecPrivate aren't written
  and the ones from the first frame are kept. Fixes #3031.
* mkvmerge: fixed the calculation of chapter timestamps read from NTSC
  DVDs. Fix by Tom Yan.
* MKVToolNix GUI: IETF BCP 47 language widget: the language combo box will now
  always contain the language code the user enters in the free-form field,
  even if it isn't in the list of often-used languages the user configured in
  the preferences.
* MKVToolNix GUI: multiplexer: when browsing for the destination file name the
  default directory is now chosen according to the preferences regarding how
  the destination file name should be formed. For example, if the policy is
  set to "fixed output directory" then that output directory will be the one
  initially set when the directory selection dialog is opened. Fixes #3021.
* MKVToolNix GUI: multiplexer: fixed the removal of appended source files if
  the "delete source files" end-of-job action is enabled. Fixes #3029.
* MKVToolNix GUI: chapter editor: when importing chapters from DVDs the IETF
  BCP 47 language elements will be set, too, not just the legacy language
  elements.

## Build system changes

* libEBML v1.4.2 and libMatroska v1.6.3 are now required. The optional,
  bundled copies of both libraries have been updated to those versions. This
  bump in requirements fixes several heap overflow bugs in libEBML.
* MKVToolNix is now using the C++17 library feature "file system library"
  instead of Boost's "file system" and "system" libraries. For the GNU
  Compiler Collection (gcc) libstdc++ this means v8 or newer is required; for
  clang's libc++ it means v7 or newer. For macOS this means that provided disk
  image will only run on 10.15 "Catalina" or newer.

官网地址：https://mkvtoolnix.download

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

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