How do you adjust the size of the video(mp4) to make it larger. It does not fit my screen on my f900. Any help would be appreciated

Start at page 175 of the manual and you will get the information you need. In short the unit wants a 640x480 format at 24 FPS. I use a program called Cucusoft and it does a great job for the iPod. Being honest, I never had very good luck trying to run video from USB or SD. Just too laggy and the whole system slowed down to a creep. I used only SDHC cards and high quality USB drives but still slow and painful.

Pioneer really needs to work on the SD interface and playing from USB. I finally just bought an iPod for music and video. Got to say once I got past the Pioneer Ipod cable woes, it worked great on video and audio and I only use the SD for changing background now. The iPod has a permanant home in my glove box now.

Best of luck with the SD, hope it works better for you than the luck I had. BTW, the best scree mode I got was a clipped 16x9 image or the small letter box like you describe. I don't think I was able to get a full screen until I went the iPod route. Now all play full screen

My experience is that DVD works better then USB or SD. But make sure you use the same codec on all fils. It looks like it just uses the first one it detects and can't change form file to file.