Apparently HTML5 was specifying that browsers should support Ogg Vorbis audio and Ogg Theora video. If that sounds too good to be true, then it is. This requirement was recently removed, and according to Manuel Amador we can thank Nokia and Apple for this.
The original paragraph was:
<p>User agents should support Ogg Theora video and Ogg Vorbis audio, as well as the Ogg container format. <a href="#refsOggTheora">[THEORA]</a> <a href="#refsOggVorbis">[VORBIS]</a> <a href="#refsOgg">[OGG]</a><p>
<!-- (it's not a MUST because some vendors may have legal reasons why they can't or won't support it, and there's no point making them non-conforming when they have no choice in the matter) -->
And the new paragraph reads:
<p class="big-issue">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.</p>
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