Mpeg-4

If you had tried to read the title of a Sony PSP MP4 file with Ruby’s mp4info or Perl’s MP4::Info you probably noticed that the title is not stored in the NAM tag where it should be. Those two libraries cannot access the title info in Sony PSP files because title info is stored in a propierary way in a custom uuid atom called USMT (User Media Tags). Inside this atom there is child atom called MTDT (Meta Data) that lists meta data entries, one of them is the title. I found all this information in the movenc.c file from ffmpeg ...

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).