With Filestar you get 146 different skills for working productively with Matroska Video .(mkv) files.
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.
MKV and MP4 are both fierce containers designed for versatile video distribution. Being the most popular video container formats, you'll often come across them. Here is how you can convert MKV to MP4 and vice versa.