MKV 是一種優秀的多媒體容器格式，它可把多種不同編碼的視頻及16條或以上不同格式的音頻和語言不同的字幕封裝到一個MKV 文件中，而MKVToolNix 是一款免費開源的MKV 編輯器和工具集，能夠合成、編輯Matroska MKV 文件。

MKVToolNix包含了以下幾個MKV專用處理工具：
*mkvmerge：將多媒體文件封裝、合併、混流為MKV文件；
*mkvinfo：輸出MKV文件組件和編碼信息；
*mkvextract：從MKV文件中提取視頻、音頻和字幕軌道；
*mkvpropedit：直接修改現有MKV文件的屬性而無需重混流；
*mmg：mkvmerge GUI，並包含了章節編輯器和頭部編輯器。

MKVToolNix 中的Mkvmerge GUI 允許你導入多個視頻、音頻、字幕軌道，混流合併一個新的MKV 文件，並可以設置導出視頻的寬高比、顯示比例、幀頻等等。

MKVToolNix 中的MKVExtractGUI 則可以從現有的​​MKV 文件中提取其中的一個或多個視頻、音頻或者字幕信息，是專業的MKV 分離工具。

MKVToolNix 是專用的MKV 剪輯工具，提供了4種MKV 切割模式，包括按尺寸、按時長、按特定時間碼和按分段，都是無損剪輯、分割MKV 過程，能夠同步切割視頻、音頻和字幕軌道。比之前介紹的所有支持MKV 分割的工具都要好用，包括Boilsoft Video Splitter、SolveigMM AVI Trimmer 等。

更新記錄：

# Version 46.0.0 "No Deeper Escape" 2020-05-01
 ## 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 eg 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. 

# Version 45.0.0 "Heaven in Pennies" 2020-04-04
 
## 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 ( if 
  any ). Fixes #2765. * MKVToolNix GUI : multiplexer , info tool : fixed the "warn before overwriting" 
  check wrt . jobs creating the same file . Fixes #2758.   
    

官網地址： https://mkvtoolnix.download

官網更新記錄：  https://mkvtoolnix.download/doc/NEWS.md

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