kvcd size prediction

[tonemgub]

Can someone please tell me how to predict the size of a kvcd file?

I have tried using this guide: http://kvcd.net/guides/kguide/kvcdguide.htm but I cant understand it because it looks like the author is using several different examples for his calculations (ex. he uses a file with 155413 frames then he uses a file with 208885, then he uses a file with 233505). A simple step by step guide using the same file throughout would be much appreciated.

[celtic_druid]

I thought KVCD's were pure VBR? If so then you can't really predict the size. You could always do a 2 pass VBR encode, but with the KVCD notch quant matrix. That way any bitrate calculator will do.

[tonemgub]

Yes there is some way that they do it by encoding samples throughout the movie and take the file size and put that in a formula and you get the prediction size. It looks easy but when I do it I get this ridiculously large file, the author gets a 15.3mb sample file size using a file with 155413 frames, I get a 103mb sample file size using a file with 179898 frames.

[celtic_druid]

Yeah I was just thinking that after posting.... Without running a bunch of compressibility tests. There are apps for doing this with CCE, HCEnc, etc. for 1 pass DVD encoding. No idea about KVCD.

179898 frames represents what percentage of your encode?

Hang on. 155,413/24 = 6,475 seconds/60 = 108mins. No way you are going to get 108mins at 15.3MB's.

[tonemgub]

179898 is the number of frames in my original file
The author is somehow getting a 15.3mb sample file using a source file with 155413 frames. In his avisynth script is "Sample(100, length=24)", I use "SelectRangeEvery(100, length=24)". Do Sample() and SelectRangeEvery() do the same thing? If not, then that may be my problem.

[celtic_druid]

That would give you 0 to 23, 100 to 23, etc.

So if you get 103MB's then it means that your final should be around 430MB's.

[tonemgub]

I used sampler(100, length=24) instead of SelectRangeEvery(100, length=24) and it predicts it within 2mb, wow.

If anyone is wanting to do this with avisynth 2.5 you need this sampler dll > http://www.incredible.de.tf/Downloads/Sampler-2.5.rar