The HTML5 draft specification adds video and audio elements for embedding video and audio in HTML documents. The specification had formerly recommended support for playback of Theora video and Vorbis audio encapsulated in Ogg containers to provide for easier distribution of audio and video over the internet by using open standards, but the recommendation was soon after dropped.
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Motivation
Because some visitors and publishers choose not to take part in the use of proprietary software, web content has been made available through freely implementable open standards in order to reach these users. As multimedia is already mainstream on the web through proprietary data formats (such as Windows Media Video and MP4) and browser plugins (such as Adobe Flash Player), developers had hoped Theora and Vorbis would become part of the HTML5 specification.
Users affiliated with the free software movement claimed the following advantages:
video and audio elements would require less effort than mastering the object element or learning ActionScript as required by Adobe Flash.CTO at Opera Software, Håkon Wium Lie explained in a Google tech talk entitled "The <video> element" the proposal of Theora as the video format for HTML5:
I believe very strongly, that we need to agree on some kind of baseline video format if [the video element] is going to succeed. [...] We want a freely implementable open standard to hold the content we put out. That's why we developed the PNG image format. [...] PNG [...] came late to the party. Therefore I think it's important that from the beginning we think about this.
After the presentation, Lie was asked whether Opera will support other formats than Ogg:
My opinion is that browsers shouldn't support other codecs, at least not in the beginning, until we have established a baseline format. [...] We don't want to contaminate <video> with other formats.
Support
Opera Software and Mozilla have been advocates for including the Ogg formats into the HTML standard. Support has been available in experimental builds of Opera 9.5 since 2007, and Ogg Theora is fully supported since Opera 10.50. Gecko 1.9.1 (browsers based on this engine include Mozilla Firefox 3.5 and SeaMonkey 2.0), released on June 30, 2009, was the first non-experimental layout engine to support Ogg formats. Google Chrome included support in their 3.0 release (September 2009), along with support for H.264. However, they did not support MPEG-1 (the parts patents on which are thought to have expired), citing concerns over performance.
Opposition
On October 17, 2007, the World Wide Web Consortium encouraged interested people to take part in a "Video on the Web Workshop", held on December 12, 2007, for two days. A number of global companies were involved, submitting position papers. Among them, Nokia's paper states that "a W3C-led standardization of a 'free' codec, or the active endorsement of proprietary technology such as Ogg [...] by W3C, is, in our opinion, not helpful". Xiph.org's codecs, while licensed under a BSD-style permissive free software license, implement a standard controlled by Xiph.org themselves, rather than a multi-vendor community such as MPEG. Apple Inc., a member of the MPEG LA, has also opposed the inclusion of Ogg formats in the HTML standard on the grounds that H.264 performs better and is already more widely supported, citing patents on their codec's efficiency and the lack of precedents of "Placing requirements on format support", even at the "SHOULD" level, in HTML specifications.
Recommendation retracted
On December 10, 2007, the HTML 5 specification was updated, replacing the reference to Theora and Vorbis with a placeholder:
It would be helpful for interoperability if all browsers could support the same codecs. However, there are no known codecs that satisfy all the current players: we need a codec that is known to not require per-unit or per-distributor licensing, that is compatible with the open source development model, that is of sufficient quality as to be usable, and that is not an additional submarine patent risk for large companies. This is an ongoing issue and this section will be updated once more information is available.
The removal of the Ogg formats from the specification made it completely file format neutral, like previous versions of HTML. The decision was criticized by a number of Web developers. A follow-up discussion also occurred on the W3C questions and answers blog.
In response to criticism, the WHATWG has cited concerns over the Ogg formats still being within patent lifetime and thus vulnerable to unknown patents. Such submarine patents may also exist for formats like MP3. Also, the AVC patent licensing policy is subject to change in a not-yet-clear manner.
Adoption
As of May 2010, HTML5 video is not currently as widespread as Flash videos, though of recent rollouts of experimental HTML5-based video players on websites, DailyMotion is so far the only one to use Ogg Theora and Vorbis formats, which suggests an increasing early interest in adopting HTML5 video.
"WebRTC Audio Codec and Processing Requirements" Internet standard drafts, published in 2011-2013, require free formats, including Opus, which was developed, among others, by programmers associated with Xiph.Org Foundation (the maintainer of Ogg).