MP4-Converter is the next generation easy-to-use software that converts just about any video and audio file that can be played on your computer.
Extremely fast conversion speed and simple user interface.
MP4-Converter: http://mp4-converter.info/

Free MP4 Converter, WinX Video Converter, could convert all different video formats to MP4 video file. 

http://www.winxdvd.com/video-converter/

You can also try a Mp4 called domino mp4 video covnerter. I have used it for a long time and like it very much. Domino can convert almost all video formats to MP4. Both of the conversion speed and quality are excellent. You can download it at here: http://www.dominoconverter.com/mp4-video-converter.html