>>51
Too bad Theora is not that good technically, and most people that use it use it only so they don't have to pay patent royaltees to MPEG.
I expect the video tag to support H264 and AAC audio in MP4 as a minimum. I would rather not have it support flash video though. MKV, Vorbis and AC3 support would also be nice, but I have my doubts they'll include it. Couldn't care less about AVI or MP3, but MP3 has been supported in a lot of browsers anyway.
This is a bit offtopic, but you guys know that technically IE has supported all these formats before they even existed?
by allowing ActiveX controls, and they had one for DirectShow players, and for dshow, the user could have any numbers of filters/splitters/decoders installed, which would play the content seamlessly. Of course, this is all terribly insecure, but not that much more than having a browser support a few dozen video/audio/container formats - one is bound to have some vulnerabilities anyway.