Описание тега matroska
This tag is for questions about playback of, creation of, and programmatic interaction with Matroska files.
Matroska refers to extensible, open source, open standard Multimedia container. Matroska is usually found as.MKV files (matroska video),.MKA files (matroska audio) and.MKS files (subtitles) and.MK3D files (stereoscopic/3D video). It is also the basis for.webm (WebM) files.
More details at
http://matroska.org/
http://en.wikipedia.org/wiki/Matroska