Originally Posted by Runamuck

AFAIK, PSP's running a current OS use vids that are natively MP4's but encoded using H.264/AVC, which I'm pretty sure is a Sony-proprietary codec. Regardless, while the 8800 can read a MP4 video, it can't decode H.264...only H.263. So you'd need to convert your PSP video to H.263 codec to get it to work.

I've both a PSP and an 8800 so I feel your pain...I've literally got dozens of my fave movies in PSP format.