Matroska Media Container — Homepage
Welcome to the Home of Matroska the extensible, open source, open
standard Multimedia container. Matroska is usually found as .mkv
files
(Matroska video), .mka
files (Matroska audio), .mks
files
(subtitles) and .mk3d
files (stereoscopic/3D video). It is also the
basis for .webm
(WebM) files.