Quote:
Files that can be played
You can play files of the following types on the PSP™ system.
* Memory Stick™ Video Format
* - MPEG-4 Simple Profile (AAC)
* - H.264/MPEG-4 AVC Main Profile (CABAC) (AAC) and Baseline Profile (AAC)
* MP4
* - MPEG-4 Simple Profile (AAC)
* - H.264/MPEG-4 AVC Main Profile (CABAC) (AAC) and Baseline Profile (AAC)
* AVI
* - Motion JPEG (Linear PCM)
* - Motion JPEG (μ-Law)
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Source
That's a list right from the PSP's manual site. try downloading something like PSPvideo9 to convert your videos over to a format the PSP can play