I was hoping to find a fun break-out-board that took an SD card (or the likes) and played mp4 or the like to AV (composite and stereo audioo) and (hopefully) be controlled by my circuit to output to composite and audio on a small 3" LCD screen. I have the LCD screen and driver board that accepts composite, and it’s pretty low power (5vdc, 128ma) but I am having a problem finding something I could use/hack that would work for supplying it the ‘movies’. I was hoping to make a tricorder prop with a working screen. 
Anybody seen something like this? (the board that is - I know people have seen a tricorder. :-))