Hey kida the Horse!
I Probably might know why your PSP does not play your MP4 videos!
When you put a video on the MP_Root/100ANV01 folder, you should give an especific name to the video-file, but i not sure what name you should give to it, It's a combination of numbers and letters, I don't know how to name them, cause the PSP Video 9 Software gently re-names them for me...
Guys... any suggestion??? I mean, I hope thats the problem, if not try following my advice of re-formating the stick...
