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 5.4.0 发布，改进记录：
1. The AVC/h.264 timecode handling code has been completely rewritten.
2. Users do not have to specify the --default-duration/FPS for such tracks anymore.
3. The (E)AC3 code has been completely rewritten, fixing several issues.
4. The file type detection code has been improved for several file formats.
5. MicroDVD subtitles are now recognized as an unsupported file format.
6. The "--default-duration" option and mmg's "FPS" field can handle values like "25p" or "50i".