Blizzard: HTML5 video and H.264 - what history tells us and why we're standing with the web

When I looked into it a few years ago, I heard that Dirac wasn't a viable replacment for mpeg/h264/ogg and never will be because that's not it's goal. It was designed to make high-quality copies of videos for archiving. This was the reason the BBC's own (DRM'd) online movie player doesn't use Dirac.

(Maybe things have changed. I think it was 2008 when I read that.)