Videos must be encoded in MP4 format before they can be played on the PSP. Several software applications are available to convert videos into MP4 format.
For Firmware Versions < 2.80
The videos should be copied to the “MP_ROOT” folder on the root of your Memory Stick Duo.
If they were encoded in standard MP4 codec, put the videos in the 100MNV01 subfolder. The file should be named as M4VXXXXX.MP4, where X is a number. If the MP4 files were encoded in the H.264 codec, the videos should be places in the 100ANV01 subfolder. This file should be named as MAQXXXXX.MP4, where X is a number.
For Firmware Versions 2.80+
The videos should be copied into the “VIDEO” folder found on the root of your Memory Stick Duo. The files do not need to have a set name standard and both standard MP4 and H.264 files can exist in this folder.