you can use **[ffmpeg][1]** (a **free** command line tool for mac and linux and windows) to encode **wmv to mp4**. here is an example syntax:

    ffmpeg -i [your_video.wmv] -r 20 -ar 44100 -ab 196 -b 300k -aspect 4:3 -s 320x240 -croptop 0 -cropbottom 0 -cropleft 0 -cropright 0 [your_video.mp4]

-r 20 is the framerate [frames/second]

-ar 44100 is the audio rate [samples/second]

-ab 196 is audio 196kbps

-b 300k is the video bitrate of 300kbps

-aspect 4:3 is the desired aspect ratio

-s 320x240 will scale to E8 screen resolution


  [1]: http://www.videohelp.com/tools/ffmpeg