If you’re new to the PSP you must remember when copying files video files (created with 3GP converter or PSP Video 9) to your PSP that M4Vxxxxx.MP4
files go to the MP_ROOT/100MNV01
dir of the Memory Stick and the MAQxxxxx.MP4
files go to MP_ROOT/101ANV01
dir.
M4Vxxxxx
files are conventional MPEG-4 files and MAQxxxxx
are MPEG-4 files using AVC codec (recommended).