MKVToolNix is a free application for editing MKV files. With the free application you can cut a large file into smaller pieces, or vice versa join smaller pieces into a larger one. You can save the MKV audio to Mp3 and also easily embed subtitles.
It is a very practical tool for those who have HD movies on their computer and want to edit them. 
MKVToolnix project developer Moritz Bunkus has announced the release of the new MKVToolnix 14.0.0. It is a major release of the open-source and cross-platform (Windows, Linux and Unix) MKV (Matroska) application.
MKVToolNix 14.0.0 “Flow” was released exactly one month after MKVToolNix 13.0.0 “The Juggler”, and it seems to add a lot of new features and improvements, along with several bug fixes and some system changes.
The new MKVToolnix 14.0.0 includes support for 960 samples per frame AAC files in mkvmerge, support for Wave64 files in WAV reader, support for WebM files from MKVToolNix GUI, as well as support for tags in WebM files in Mkvpropedit. As of this release, the minimum required Boost version is 1.49.0 for building MKVToolNix.
The MKVToolNix GUI now has a new feature in the “additional modifications” dialog, which can be used to calculate and set chapter end times. Also, the new MKVToolnix 14.0.0 has many bug fixes that improve the AVC/H.264 and HEVC/h.265 parsers, MPEG PS and MPEG TS readers, DocBook detection and the MKVToolnix GUI multiplex tool.
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