2nd pass bitrate adjustment possible?

a question: is it possible to re-calculate the bitrate for the 2nd pass on basis of the result of the 1st pass? for example: before the 1st pass gknot says: 1000 kb/s if you're doing the 2nd pass also with a birate of 1000, the file turns out to be too small, but if you had chosen 1013, the file size would be exactly the correct size

what I actually mean is: is there sort of a test which can determine the exact new value of the bitrate for the 2nd pass? is this possible by looking at the result of the 1st pass? I hope I'm clear with the question...

Hi- I've read of the undersized problem, but haven't encountered it myself. All I can suggest is to set the bitrate 1% over what Gknot tells you, and then adjust for the 2nd episode on the CD if the first episode comes out under-oversized. It looks to me as if you're doing everything by the book. Maybe someone else has a suggestion.

daniel: 1. Try divx4log method... 2. You can try encode movie and credits separately, so you can adjust final size (+/- few megs) by reencoding credits on higher/lower bitrate

thanks i will try the program!

hmm.. i'm experimenting with divx4log and read the doom9 guide for the program, but it's only about keyframes and deltaframes, not about b-frames so how do i have to configure the settings on b-frames?

divx4log 0.48 supports b-frames

@daniel: I personally set divx4log as following: - I-frame quantizers 2-2 - P-frame and B-frame quantizers 2-x (x depends on target bitrate), so B-frame quants to the same level as P-frame quants. - I leave B mult untouched (so 2.00). - for movie I use square quantizer distribution for all quantizers (it doesn't matter for I-frame quants, cause I set them to 2-2) - for credits I use root quantizer distribution - source always based on motion - no trimming

thanks! i'm gonna try it!

@daniel: Don't forget to do 1st pass with quants 2-2 and bitrate 10000 and exact codec settings (Qpel,GMC,B-frames and PSY) in both passes, but I'm sure you know that ;)