bitrate modulation settings that work for 3 conditions

[dede95064]

after having searched some threads under bitrate modulation for divx5.05 and having gone to the divx.com site/forums, i can't seem to find anything on where there is a good all-purpose setting for this. basically, what i'm interested is a good range for high-action movies, for low action movies and also for a movie that falls in between. i'm trying to avoid the word best as i know it's subjective, and that's why i'd like to see if i can get a range of appropriate settings. i've been told that "mathematically" there should be good ranges that suit these 3 movie types. i don't know the validity of that statement but i'm willing to to hear what others have to say about this.

also, under this thread: http://forum.doom9.org/showthread.php?s=&threadid=52163&perpage=20&pagenumber=2
the user matthaeus gives a suggestion on leaving this setting to .20. he has an argument as to why this works but i'm wondering if his argument is sound as i'm not very technical when it comes to how divx distributes its data while encoding.

i know that when nothing else works, leaving this setting at default is always a good fall back. but since there is a slider available, i wanted to know how this slider works and how to properly use it.

thanks for any help. :)

[JohnMK]

To be honest I see no value of changing this slider from default, best to keep it at the neutral position for all scenarios, IMO. Why they even made this slider visible in the first place is beyond my comprehension.

[dTb]

I'm not so sure that a movie with a lot of high motion will necessarily benefit by adjusting the modulation towards high motion. I'm unsure exactly how it works but it seems to me that the higher the percentage of fast motion scenes the more bitrate will have to be taken from the low motion scenes so these low motion scenes could end up looking very bad.
I've tended to look at the modulation from the point of view of 'how do you percieve the quality of the high motion scenes when compared to the low motion scenes?' If you consider the low motion scenes look great but feel the high motion scenes are lacking a little, then adjust the modulation slightly towards high motion.
I use a value of -0.02 most of the time because I like having the high motion scenes slightly better quality than what constant modulation provides.

About what Mattheus posted in that other thread, bear in mind that he was talking about using an unusual method of encoding and the modulation he was using was pretty specific to that method.