Movies in the "Video" folder not playing

[Timstuff]

When I just recently heard that PSP could supposedly play MP4 format videos just by copying them to the "Video" folder on the memstick, I was really excited. However, for some reason any video file I put in there shows up on the PSP's video menu as "unsupported data." Just to make sure it wasn't a problem with the files themselves, I copied a video that already worked from the MP folder into the Video folder. Still same results. Does anyone know what the problem here might be? Thanks in advance.

[mike_jmg]

It's not supposedly, it does play mp4 vids
my guess, if it shows unsupported data means that they're not converted properly or not converted at all

there are a lot of programs to convert videos into mp4 psp format, some are freeware and work ok
There is one hanging around these forums called Xvid4PSP 4113

I use ImTOO MPEG encoder, it works okay (I use this one because xvid4psp requires win XP)