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 49.0.0 "Sick Of Losing Soulmates" 2020-08-02
 ## New features and enhancements *mkvmerge:added supportforcopying thenewtrack header elements
  `BlockAddIDName`,`BlockAddIDType`,`BlockAddIDValue`and`BlockAddIDExtraData`fromMatroskafilesifthey exist.Partof the
  implementation of#2887.*mkvinfo:added supportforthenewtrack header elements
  `BlockAdditionMapping`


   
     
, `BlockAddIDName` , BlockAddIDType `, ` BlockAddIDValue ` 
  and ` BlockAddIDExtraData `. Part of the implementation of #2887. 
* MKVToolNix GUI: multiplexer: the list of recent directories can now be 
  edited in the preferences → "Multiplexer" → "Destination file 
  name". Implements #2861. 
* MKVToolNix GUI: preferences: the values in the various "predefined values" 
  lists can now be re-ordered freely by dragging & dropping. ## Bug fixes
 
* mkvmerge: Matroska reader: when reading tracks (eg a subtitle track) from 
  Matroska files with their ` default track ` flag set to ` yes  

`, and when 
  overwriting those via the command line to ` no `, ` mkvmerge ` would not promote 
  additional tracks of the same type from other files (eg another subtitle 
  track from an SRT file). Fixes #2863. 
* mkvmerge: SRT reader : empty lines inside entries were doubled. Fixes #2888. 
* mkvmerge: subtitles: when calculating the rounded duration of each entry the 
  error from rounding the corresponding timestamp will be taken into 
  account. Fixes #2890. 
* mkvextract: SSA/ASS extraction: mkvextract is no longer inserting empty 
  lines before the ` Dialogue :  ` lines. Fixes #2876.
* mkvextract: USF subtitles: start & end timestamps were too high by a factor 
  of 1.000.000. Fixes #2875. 
* MKVToolNix: info tool: when saving to a text file the checkbox "Save as 
  default for saving output to text files" did nothing. Fixes #2869. 
* MKVToolNix: info tool: when saving to a text file in "all elements in a 
  tree-like structure" mode, the GUI always stopped at the first cluster 
  regardless of the setting of the "verbosity" option . 
* MKVToolNix GUI: preferences: when tooltips were disabled the dialogs for 
  adding new entries to the various "predefined values" lists were missing 
  their texts. 
* Windows installer: the images are shown again. Fixes #2868.
* configure: fixed detection of QtDBus. Fixes #2886. 

## Build system changes 
 
* libMatroska v1.6.1 is now required.The bundled version has been updated to
  that version.

官網地址： https://mkvtoolnix.download

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

軟件下載地址：
Download官網x86綠色版：MKVToolnix 49.0.0 Final綠色免安裝版
Download官網x64綠色版：MKVToolnix 49.0.0 Final綠色免安裝版
Download官網x86安裝版：MKVToolnix 49.0.0 Final安裝版
Download官網x64安裝版：MKVToolnix 49.0.0 Final安裝版