MP3 recorded video songs on Flush problem

Hello,
i moved all of my music, videos, and pictures from my DVD's and onto a memory stick the , then plugged it to the usb for my mp3 pot on my radios, it reads the usb and plays audio music but it does not play the video songs & doesn't displays all of the labeled folders, but for some reason when i try and access the folders it displays nothing at all when the folder openes up,it simply display No pictures i tried pressing triangle for the display all option but all it does is give me more empty folders that dont work, why is this? and what can i do to fix the problem? thank you

kayozu