Help with movies size on PSP

Guys, im trying to convert a movie avi to mp4 but after i do everything the movie is not the whole size of the psp screen, i heard the size is 480x272 but i got 2 different programs to convert the movie, Xilosoft and 3GP and none of them have that size, any sugestion? thx in advise.

3gp works fine for me. On 3gp, be sure to select the format that says psp on it. Or you can try toggling with your psp to get different sizes.