Just bought a used p3 adv. Everything seems to work well. Only flown twice. Got outside to test it last night. It was getting too dark but i recorded anyway. The video looks good on the fpv. Whe i look at the sd card. The video is really grainy and studders, pixelizes and locks up some time. I transered it directly to the computer. Still same quallity.

You're watching the wrong video.  Look on the card for the HD video.