Xmpeg - Same filesize but diffrent rates

[Greffel]

Why is this possible:

I whant to ripp down a movie on 2 cdr's. First i follow the tutorial here on this site (Xmpeg divX 4 tutorial) I choose to go for 1900 Kbits as the calculator says. That givs me a filnal file size of 950Mb not 2 full cdr's. Then I set the Kbit rate to 2300 and hope to get better pic and bigger file size. But I end up with the sam as the first one.

How is this possible? The sound and pictur is greate but not 2 full cdr's.??

[khp]

2 possiblities:

1. maybe your minimum quantizer is too high, it should be 2.

2. otherwise your movie is saturated, that is you can't get more quality from a higher bitrate, at the current resulution.
To solve this raise res to 720(or 704)*X.
Or use more bitrate for audio :)

[Greffel]

My minimum quantizer is at "2" so thats ok?

Is it realy not possible to get more quality out of a movie by more bitrate?

Are there any calculators that take the resulution in to the calc?
or is it just try and see :)

this example was the movie "along came the spider" the playtime is ca 90 mins. It's in a Pal resulotion from the beginning
when i set up the Xmpeg i chose 640*xxx res but in the encoding window it says 624*272 and no matter how high i set the bit rate ... the file is just a littlebit smaller then 950 Mb.

Is this realy normal, I have seen movies that are shorter playtime and still are 2 full discs.

Now i test to ripp it in only 900Kbits hope to end up with a file that is around 700 Mb

Still thanks "khp" for your answer.

[khp]

Are there any calculators that take the resulution in to the calc?

Resulution really don't have anything to do with bitrate, except in the extreme cases where the codec can't reach the desired bitrate. GordianKnot lets you do a compressability check, which helps you figure out which resulution you should use, to get the best quality at the desired filesize.

For a detailed guide to gordian knot look in the guides section, there is a divx4 and a divx3 version of the guide.

Is this realy normal, I have seen movies that are shorter playtime and still are 2 full discs.

Some movies compresses better than others because they, contain less action(movement), is higher quality (less video noise), and generally contain less complex images.
I don't know the movie u talk of, but if it contain lots of dark scenes, large portions of the images might simply be completly black which will compress very well.

[Greffel]

Thank you verry much you have been verry help full and right what you told me.
I now have the movie on 1 cdr and the quality is greate.
Just never thougt the file could have a max in file size.

//Greffel