Try Mp4 with following properties:
Encoder = h.264
Frame rate = 23.976(NTSC) or 29.97(PAL)?
Resolution = 480 x 320
Video bitrate = 500-1000 kbps
Audio encoder = AAC
Audio bitrate = 320 kbps
Aspect ratio = 16:9
You can use this
Aimersoft Media Converter to approach it.
Hope it helps!