mkv

The Matroska Multimedia Container is a free, open-standard container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is a universal format for storing common multimedia content, like movies or TV shows. Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF), but is entirely open in specification, with implementations consisting mostly of open source software. Matroska file extensions are .MKV for video (which may or may not include subtitles and audio), .MK3D for stereoscopic video, .MKA for audio-only files, and .MKS for subtitles only."Matroska" is derived from matryoshka (Russian: матрёшка [mɐˈtrʲɵʂkə]), which refers to the hollow wooden Russian matryoshka doll which opens to expose another doll that in turn opens to expose another doll, and so on. That may be confusing for Russian speakers, as the Russian word "matroska" (Russian: матроска) actually refers to other things, e.g. it could refer to a sailor suit, or a sailor's wife, or a female sailor. The logo uses "Matroška", with the caron over the "s", as the letter š represents the "sh" sound (/ʂ/) in various languages.

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