And what if you have around 8 petabytes of video (<a href="http://beerpla.net/2008/08/14/how-to-find-out-the-number-of-videos-on-youtube/" rel="nofollow">http://beerpla.net/2008/08/14/how-to-find-out-the-number-of-...</a>) in H.264? What would you do, double your storage? How long would that take to re-encode anyways. The reason why Youtube is using H.264 instead of Theora is because they already have the videos in that format.