Use JW Player 5.5 (http://www.longtailvideo.com/players) in the media element as swf (flash) player. It supports H.264 (.mp4, .mov, .f4v), FLV (.flv), 3GPP (.3gp, .3g2), AAC (.aac, .m4a), MP3 (.mp3). Please see documentation for installation instructions.