If you are watching DVD's with a standalone player on a reg TV (most people do), 16-235 is correct because you won't be able to see the diff.... regular TV's can't display 0-255

The Luminance Level setting does absolutely nothing unless you input RGB. Since a DVD is YV12 and DVD-RB converts it to YUY2 via AviSynth when using CCE, checking 0-255 or 16-235 will produce exactly the same output since there is no RGB conversion.

yep, that makes sense... I researched that in the old days of DVD2AVI... didn't really thought about it since. Thanks for the help everyone.