I agree with SAKryukov and Sandeep, changing into any format is unrealistic.
You should provide us with more information on your project, but I will give you a suggestion.
You mention "live video" in your question. Are you saying you have a video camera streaming live video and you want to display that?
If this is the case, you should take a look at VLC:
www.videolan.org/vlc/index.html[
^].
I have had to display live video in a web page and I decided to use the VLC media player because it can handle many different video formats and it can be used with the major browsers. Besides that, the video I had to display was being streamed using RTSP/RTP and I was not able to get QuickTime or RealPlayer to display the video.
Using the VLC plugin I was able to display live video in Internet Explorer, FireFox, Google Chrome and Safari.
One huge problem I ran into was that the users have to install the VLC package on their computers first (if anyone have a way of avoiding that, I would be grateful, but I suppose that is a question I should be asking).
Soren Madsen