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Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
|Internet media type|
|Initial release||1 June 2004 (2004-06-01)|
|Type of format||Video coding format|
|Contained by||Ogg, Matroska|
|Initial release||3 November 2008 (2008-11-03) (1.0)|
|Operating system||Unix-like (incl Linux, Mac OS X), Windows|
|Type||Video codec, reference implementation|
Theora is derived from the formerly proprietary VP3 codec, released into the public domain by On2 Technologies. It is broadly comparable in design and bitrate efficiency to MPEG-4 Part 2, early versions of Windows Media Video, and RealVideo while lacking some of the features present in some of these other codecs. It is comparable in open standards philosophy to the BBC's Dirac codec.