MKVcleaver is a GUI (Graphical User Interface) frontend to the command line tool MkvToolNix designed to extract data from MKV files. Matroska or MKV is a multimedia container format that can hold an unlimited number of video, audio, picture or subtitle tracks inside a single file, complete with menu systems similar to that of DVDs. MKVcleaver allows you to extract these tracks - video, audio, subtitles, chapters etc. that contain in an MKV file.