Matroska file extensions are .mkv for video (which may include audio, subtitles and chapters), .mk3d for stereoscopic video, .mka for audio-only files (which may include subtitles), and .mks for subtitles only.

History

The project was announced on 6 December 2002 as a fork of the Multimedia Container Format (MCF), after disagreements between MCF lead developer Lasse Kärkkäinen and soon-to-be Matroska

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