So.... theora gets native support by ff3.5 . Great! At last a browser that is supported by all current OSs supports some kind of video native. buuuut .... how to get a wmvavisomekindofotherstuff into the right format? ffmpeg2theora example.avi http://v2v.cc/~j/ffmpeg2theora/examples.html u need to grab this (ready to run binaries): http://v2v.cc/~j/ffmpeg2theora/download.html howto get it convenient? I like to invoke the conversation through the explorer. you have to make a link between the extension and ffmpeg2theora. dont forget to put %1 between two quotes! works.