Playing DVD-R movies on PS2

I have just made my first dvd-R movie, plays fine on my commercial player but not on my sons PS2 any ideas on the corrections i need to make guys?

You must open up your PS2, and solder in a mod chip (Voiding the warranty).

You do not need a MODCHIP to play DVD-R Movies on the PS2, only if its copied games.
I have tried it on a non-modded PS2 myself, The problem could be is the Lens inside the PS2, you gotta make sure that the PS2 is 3000xR model (note the R) some say upgrade the DVD Drivers but im not sure on that one