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'Theora' is Xiph.Org's first publicly released video codec, intended for use within the Ogg's project's Ogg multimedia streaming system. It is derived directly from the VP3 codec; currently the two are nearly identical, varying only in encapsulating decoder tables in the bitstream headers, although substantial changes and improvements may be expected in the future.


User FAQ avilable in HTML format from Developer API reference available in HTML format from; Developer API reference available in PDF format from

"IRC irc:// " IRC Help channel
"IRC irc:// " IRC development channel


Download version 1.0alpha3 (alpha)
released on 20 March 2004

VCS Checkout


Related Projects


LicenseVerified byVerified onNotes
BSD 3ClauseJanet Casey26 October 2004

Leaders and contributors

Manuel Lora Maintainer

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Developer E-mail
Support E-mail

Software prerequisites

Kind Description
Required to build libvorbis 1.0.1 or later
Required to build libogg 1.1.1 or later

This entry (in part or in whole) was last reviewed on 10 February 2008.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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