I've just sync my iphone with iTunes after adding an MP4 video into iTunes. This MP4 plays fine in iTunes but when sync'd with my iPhone it only plays the sound, I don't get any picture.

Any ideas on how to resolve this?

I have used www.winavi.com MP4 converter and converted the MP4 into Ipod MP4 and now I get the picture but no sound.

please help..

Mark