http://tools.google.com/dlpage/webmmf
http://www.webmproject.org/users/#playing_on_youtube
Testing video: http://www.youtube.com/watch?v=G1NToypZKYc&feature=watch_response
Video converted in WebM format (.webm). Original video source has MPEG-TS format (.mts), 1080i. For convertation it used "Miro Video Converter 2.0" (VP8 codec). It is free, download here http:// micovideoconverter.com/
