ISO/IEC JTC1 SC29 WG1, more commonly known as "MPEG", is active in standardizing video formats, including H.264, MPEG-2 and a lot of other variants. Website.
Of special interest for open codecs: In January 2011, it issued a press release stating that a call for submissions for a freely available codec (what they call "type-1 licensing") would be issued in March 2011.
MPEG is also the home of the "streaming over HTTP" technology initiative known as DASH - more info at their website.
MPEG operates under the ISO directives - IPR rules are found in appendix I of the ISO/IEC Directives, part 1.