mkvtoolnix (又叫Matroska toolkit)，是一套">功能强大的mkv(Matroska)格式制作和处理的工具，支持将多种视频、音频、字幕等格式封装成mkv格式。mkvtoolnix新版本提供了安装程序。
Mkvtoolnix 中包含了一个图形界面程序mmg.exe，这样使得制作mkv更简单和直观。还包含 MKVextractGUI.exe程序，可以提取 MKV 文件里面的音视频和字幕文件。Mkvtoolnix是目前功能最齐全的Matroska合成器，除了WMV和MPEG-1/2之外，它几乎能将所有的媒体合成到MKV中去。
1、目前mkvtoolnix支持大部分的视频、音频和字幕格式的封装，但部分格式并不支持，比如asf、wmv等格式，需要asf2mkv recorder的辅助才能进行MKV的封装；安装运行asf2mkv recorder，在软件窗口的地址栏中输入源文件的完整路径（也可复制），然后单击“Record！”按钮，会弹出另存为对话框，在其中设置好MKV文件保存的路径及名称后即可输出MKV文件。
2、新版的mkvtoolnix增加了append追加功能，可以追加视频、音频和字幕，但必须保证格式一致才可以，比如追加rmvb视频，就必须保证音频编码格式和分辨率都一致才可以追加；
3、点击Tracks中的相应项目，然后在Track options中进行设置。对于视频、音频和图形字幕一般可以不设置，默认即可；对于文本字幕需要设置一下该字幕在菜单中的语言显示，以方便播放时进行识别和选择；注意字幕语言如果是中文，language选择chi(chinese)，而不要选择zho(chinese)，因为选择后者，字幕菜单显示不了chinese字样，只显示undetermined（原因不明）；
4、如果字幕或音频有声音延迟，可以在Delay中定义；
5、Track name可以自定义菜单的显示内容，不过这个选项好像只对音频有效，对字幕无效，字幕名字还是要到language里面去指定；
6、如果封装的文件比较大，可以进行分割，方法是切换到Global选卡，在split中指定文件分割的方式；另外这里还可以指定MKV的标题或章节的名称，也可以不填；
Mkvtoolnix v4.8.0发行说明：
* mmg: bug fix (Windows): mmg will no longer convert the "mkvmerge executable" from just "mkvmerge" into a full path name when writing its preferences to the registry upon existing.
* mkvmerge: enhancement: Added support for VobSub IDX files with negative "delay" fields.
* mkvmerge: bug fix: The 'doc type read version' EBML header field is only set to 2 even if a stereo mode other than 'none' is used for at least one video track. Fix for bug 625.
* mkvpropedit: new feature: Added support for adding, replacing and removing chapters.
* All: Avoided a segmentation fault in gcc by not including a pre-compiled header if FLAC or CURL support is disabled.
* mkvmerge: bug fix: Reading DTS files stored in 14-to-16 mode were read partially.
* mkvmerge: enhancement: mkvmerge will rederive frame types for VC1 video tracks stored in Matroska files instead of relying on the container information. This fixes files created by e.g. MakeMKV that mark all frames as key frames even if they aren't.
* mkvmerge: bug fix: Fixed detection of AAC files with ADIF headers. Fix for bug 626.
* mkvmerge: bug fix: The 'doc type version' and 'doc type read version' EBML header fields are only set to 3 if a stereo mode other than 'none' is used for at least one video track. Fix for bug 625.
* mkvmerge: enhancement: File identification for tracks read from Matroska files with a codec ID of "A_MS/ACM" will show the track's format tag field if it is unknown to mkvmerge. Implements bug 624.
* mkvmerge: new feature: Track, tag and attachment selection via --audio-tracks, --video-tracks etc. can have their meaning reversed by prefixing the list of IDs with "!". If it is then mkvmerge will copy all tracks/tags/attachments but the ones with the IDs given to the option (e.g. "--attachments !3,6").
* mkvmerge: bug fix: Fixed handling AVIs with AAC audio format tag 0x706d and bogus private data size. Fix for bug 623.
下载地址：http://www.bunkus.org/videotools/mkvtoolnix/downloads.html