comp check doubts...

[soniv]

ok, the guide for DivX 5 says:
...If the Bits/(Pixel*Frame) the first value, right above the Load button matches this value you have perfect quality, going for a higher value would be overkill as the movie wouldn't look any better.. The limit of the codec has been reached.
and...
...the relationship between the optimal case and what you're going to get at the currently selected resolution. 60% or higher will pretty much guarantee that you'll get pretty good looking results.
I completely undertood what it means but what should be my parameters to actually preview the final relationship between quality and size?
I should focus on the % values, on the returned value (comparing to the Bits/(Pixel*Frame)) or both??

Apreciate your help! :)

[theReal]

What is going to help you most is to focus on the % value returned by the comp. test.

The Bits/(Pixel*Frame) value indicates what % value you can expect from your settings before you did the compress test.
Recordings from a DV camcorder mostly have a B/(P*F) value of about 0.40 to 0.50 until you get into the 50-60% regions, "Ghosts of Mars", on the other hand, reaches 71% with a B/(P*F) value of only 0.14.

The % value is pretty accurate, because for both cases, DV and "Ghosts of Mars" (or other very compressible movies), a percentage of 70% results in very good quality, while a percentage of 30% results in much too much artefacts.