Encoded file bigger than the source, why?

[RMCF]

Hey,

I encoded a DVD rip (ntsc, 1 hour show with ac3) with the 100% quality, 640 max width and 192cbr mp3 sound and it came out bigger than the source. Why is this? I was under the impression that 100% quality = q2 in which case the file should still be smaller.

EDIT: I never had an old Xvid codec before. Used AutoGK 1.60 and then installed 1.88 beta over it. Unless you have to deinstall 1.0.2 when upgrading to 1.0.3.

Thanks.

[jggimi]

There is no particular reason that a Quantizer 2 MPEG-4 encoding should be smaller sized than an MPEG-2 source.

Quality based encodings do not have predictable sizes, regardless what Quantizer / Matrix combination is used.

[RMCF]

Oh okay. Thanks for the answer.