DirectShow DVD Issues

Hi all.

I'm building a little sample app following the Windows DVD samples in Dx9. But i'm having some quality issues...

I have copied the entire DVD to Hard disk, but when i render and then play the DVD i'll get a 'freeze' at about 20 sec of 30. Always in the same spot. The second time through that chapter, it's fine and smooth. It almost seems as if the video isn't cached properly - or fast enough.

Is there a way to pre-cache a dvd before i play it? I mean without doing stuff like RAM file or RAM disk.

Thanks