How do I name movie files on the psp?

i converted files to mp4 and brought it over to the psp. i found out it has to be the naming format of M4Vxxxxx.mp4 for the psp to recognise it. But when I go navigate on the PSP it's just called "movie 1".

how can I name it to whatever the name of the movie is? Ive looked everywhere and I cant find an answer.:confused:

thanks

use a prog like psp video 9 and change the setting under file info tab.

thanks, ill give it a try :)