Theora
Theora is a free lossy video compression format. It was 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.
| Filename extension |
.ogv, .ogg |
|---|---|
| Internet media type |
video/ogg |
| Developed by | Xiph.org |
| Initial release | 1 June 2004 |
| Latest release | Theora I 16 March 2011 |
| Type of format | Video coding format |
| Contained by | Ogg, Matroska |
| Extended from | VP3 |
| Standard | Specification |
| Open format? | Yes |
| Free format? | Yes |
| Website | theora.org |
| Developer(s) | Xiph.org |
|---|---|
| Initial release | 3 November 2008 (1.0) |
| Stable release | 1.1.1
/ 1 October 2009 |
| Preview release | 1.2.0 Alpha 1
/ 24 September 2010 |
| Written in | C |
| Operating system | Unix-like (incl Linux, Mac OS X), Windows |
| Type | Video codec, reference implementation |
| License | 3-clause BSD |
| Website | www |
The libtheora video codec is the reference implementation of the Theora video compression format developed by the Xiph.Org Foundation.
Theora was 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 it lacked some of the features present in some of these other codecs. It is comparable in open standards philosophy to the BBC's Dirac codec.
Theora was named after Theora Jones, Edison Carter's Controller on the Max Headroom television program.