Split mkv into stems

Download and install the latest version of Filestar.
Right click on one or more Mkv file(s) on your desktop and select Convert with Filestar.
Type split into stems in the search box.
Press Split.

What is .mkv?

Name: Matroska Video
Extension: .mkv
Format: Binary
Category: Video
Developer: Matroska
Description: An MKV file is a video container format similar to the .AVI, .ASF, and .MOV formats. It supports several types of audio and video codecs and may include .SRT, .SSA, or .USF (Universal Subtitle Format) subtitles. MKV files also support VobSub subtitles from DVDs.
MIME Type: video/x-matroska
Sample: sample.mkv
Wikipedia: .mkv on Wikipedia