Won't play mp4 files

Does your video player support the Mp4 video files?
if it can,you can check the resolution is whether right or wrong.
if it can not,just use a video converter to convert the videos to the right format for it.
Here is the Best video converter i have ever used.

I had the same problem. It is illegal to watch videos while driving hence why they dont tell you how to play youtube off of card and usb. But after hours of testing converted videos here what works for me.
download pazera free flv to avi converter. after that you will have to custom convert the videos with these settings....video format is MPG custom MPEG-2/ FPS 29.97. Audio mp3-mpeg- layer 3/ bit rate 128 and i added stereo-2 for kicks. last but not least custom resolution 720x480. convert and it works :)