This tutorial teaches you on how to put videos on your PSP in 4 easy steps,
Connect you psp to your computer and enable usb mode on your psp
Go Start -> My Computer -> Devices with removeable storage -> PSP
Create a new folder in that section and name it ‘MP_ROOT’ once that folder has been made double click it so your inside that folder and now make another folder called ‘100mnv01’.
Now just drag and drop your movies into that folder!
*Note all movies must be in MP4 Format*