Does anyone know how to do this?

read, edit, add msv tags to an mp4 audio file with aac audio in it?

Basically I am trying to upload an mp4 file to my psp and it is complaining that the file does not have an mvs title tag?

I think QuickTime can edit the tag but I am not sure. From what I can think of, and what you posted, I think that you have mpeg-4 AAC files in your library ripped with iTunes and you are trying to copy them to your PSP? When I tried this, I had to rename the *.m4a files to *.mp4 so that the PSP could read them. For some reason renaming the files causes a loss of tag information. I have QuickTime pro so I don't know if the regular QuickTime can edit the mp4 tag or not.