MP4 should work.
Use a tool to do the conversion task.
The best and most reliable video converter tool that I’ve ever used is a tool called Video Converter . It’s able to convert all videos between various formats. Easy to use and professional.
You should really give it a try. You may check out at:
http://www.dvdvideotool.org/aiseesoft-total-video-converter/
Best of luck.