Videos in the MP4 format (H.264) are not supported and must be transcoded into the WMV format. Transcoding can be performed with the free VLC Player by selecting “WMV 2″ encoding for video and “MP3″ encoding for audio. Select “ASF” as the container format and save as a file with the suffix *.wmv.

http://www.videolan.org
http://www.ehow.com/how_6358485_convert-mov-wmv-vlc.html