Tmpgenc Plus encoding avis to dvd - varrying file sizes help

[Shudder]

I was converting some episodes in xvid format to mpg2 for dvd purposes. Each episode was about 21-22 minutes in length and I set each one to 12.45% of the final DVD size. I encoded in 2 pass VBR highest quality.

However, each one seems to be different. I had one that was 480, another about 520, and another about 535MB. I thought vbr was supposed to help get the file EXACTLY what size you wanted? It kinda blows that I now have a DVD that has 3.95 gigs instead of 4.3. An extra 50 megs per episode would be about 10% more room per file! Should I just encode for say 14% and hope it undershoots it again, and if it comes down to it I could always use DVDShrink? Or is there some setting I'm missing to have it be exact?

[pepsei]

What program are you using for this conversion?

I'm using TMPGEnc PLUS, the funny thing is, I have it set up on two computers,

1 - Dell Latitude D600 laptop
2 - Compaq Proliant ML370 G3 (2 processors)

with the exact same setting, the 22 anime clip is giving me a different file size on both. the laptop yield 860meg, while the server gave me a 1.2 gig file!!

[Krispy Kritter]

Shudder - if the original files are different sizes, then the output files will be different sizes.

pepsei - are both pc's using the exact same version of TMPGEnc?

[mats.hogberg]

Shudder - if the original files are different sizes, then the output files will be different sizes.

Not quite - if they are of different length he output size will vary. But as stated, the output size is set to 12.45% of a DVD, which should mean that each AVI, no matter length, would be encoded to the same size mpg.
Now, I don't trust such built in calculators - better to calculate the bitrate yourself, and set that value as average bitrate for VBR encoding.

/Mats