psp movies

hi.. i want to see a movie (mp4 ) at psp. i cannot find the way..
psp has a folder named videos. i paste the movie there, but after that i cannot find the movie…
Answer #1
It probably not converted to the correct file the psp can read.
Answer #2
what firmware do you have and you might have to converted to diffrent one, some of my movies work on ipod but wont work on psp.
Answer #3
but psp can play mp4 files..
the file is in mp4 format..