Off hand I'd say it's the "predicted" frames, no doubt.
The i.ctl uses only a "quant" number, which you could call the quality
value I suppose. This can range from 1 to 31; the smaller the better,
and i.ctl uses 8. So that particular control file is simply making a
series of compressed images and incorporating them into the animation,
as I understand it anyhow.
The other two control files use predicted compression based upon the
surrounding frames so chances are they could go higher or lower
dependant on each others similarity or dissimilarity.
If you can grasp the idea okay about these control files you might be
able to create your own best method. I've tried it but didn't succeed in
getting much better, and with the added downside of a larger Mpeg.
Check out section 4 of the Cmpeg.doc.


"Greg M. Johnson" wrote:
> 
> I have always had much shorter IRTC animations than the rest because I
> just cannot fit so many frames into the space limit.
> 
> Here is an experiment I just did which yet again convinces me that I
> don't understand CMPEG.
> A 350 frame animation of 320 x 240 TGA's with birds flapping wings and a
> 150 frame animation of 160 x 120 TGA's from Gilles Tran's tree macro
> were made.
> 
>                   350 bird frames        tree frames.
> I.CTL            3.8 MB               0.71 MB
> IPB.CTL        4.6 MB              0.58 MB
> PVRG.CTL   4.4 MB               0.60 MB
> 
> In one case, the I.CTL gives the smallest animation; in another, it
> gives the largest. >:-p
> 
> Bottom line: how do I get Main Actor??

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