Getting the best settings

[Commonboy]

Can someone tell me why one setting which works fine for a movie may not work well for others? I have a vcf file that encodes a movie to the exact size I want, but I get a larger file size when I encode a larger movie with the same settings. It seems like the larger the file, the more oversized it gets from my target.

Also, how should I adjust the gauge and the drf settings to fix this? If I change the gauge, do I also have to change drf or are these two things independent from each other? Please give me some details on this too. Thanks.

[rmatei]

Reading Nandub Options Explained should help you understand this better. If you set the bitrate accordingly every time, most likely the vcf uses some strange DRF settings. Try setting DRF 2-5 or 2-6. With reasonable settings Nandub gives perfect size predictability.

[Commonboy]

I use the bitrate calculator to get the bitrate every time. What do you mean by the vcf using strange DRF settings?

Anyways, here's my settings for gauge and DRF:

Gauge: min = 30, max = 80, start = 35

DRF: min = 2, max = 16

Keyframes quality: min = 4, max = 31

BTW, I only use nandub for re-encoding large avi files (800-1000Mb range) to make them smaller so they can be burnt on a 80min CD-R.

Any suggestions to help me hit the targeted file size (700Mb) is appreciated.

[Hanty]

You get different results with the same settings because you are doing different movies with completely different properties.