I have used DVD Shrink as my first choice in re-authoring/compressing/encoding. I have always used the Analyzing before the Encoding when compression was needed. Is this really necessary (as it adds twice the time)? Is the analyzing actually used to aid the encoding or is it just checking the rip for any potential errors? What I'm asking, is the final result actually any different on the finished .iso from just encoding or using analyzing and encoding?