![]() The result was a polarisation of HTML5 video between industry-standard, ISO-defined but patent-encumbered formats, and open formats. This is an ongoing issue and this section will be updated once more information is available. 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. It would be helpful for interoperability if all browsers could support the same codecs. User agents should support Theora video and Vorbis audio, as well as the Ogg container format. But on 10 December 2007, the HTML5 specification was updated, replacing the reference to concrete formats: Initially, Ogg Theora was the recommended standard video format in HTML5, because it was not affected by any known patents.
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