Ruben Laguna’s blog

Sony PSP MP4 Filenames

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).