Quantcast File Prediction Prob? or Just Me? - digitalFAQ.com Forums [Archives]
  #1  
01-17-2003, 05:59 PM
jackl jackl is offline
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Hi All,

I'm having a bit of trub with the file KVCD Predictor. Source material is 2 eps of The West Wing (low motion, drama), running time 84.5mins. Destination is a 90min CD.

I've used DVD2AVI to create the .d2v file from the 2 VOB's.

My .avs script:
LoadPlugin("D:\TMPGEncPlus\Tools\MPEG2DEC.dll")
LoadPlugin("D:\TMPGEncPlus\Tools\sampler.dll")
Mpeg2Source("W:\Test\WW000.d2v")
Sampler(length=24)

Using the KVCDplus v2 90min template, and have enabled audio & video encoding in the template (possible prob?)
CQ = 60
sample size = 16.3M
est final = 1067M
actual final = 765M

CQ = 50
sample size = 12.9M
est final = 858M
actual final = 764M

error margin = 0 in KVCD Predictor

Predicted vs actual size is way out. Can't fault the great compression but prediction is a worry.

I'm using TMPGEnc 2.58+ & Predictor 0.2

With the KVCDx3 templates, did not work for me at 528x576, but some great tests at 480x576 (I like to tinker but don't always know what I'm doing [a good way to learn]).

Any advice or observations welcome.
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Someday, 12:01 PM
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  #2  
01-17-2003, 08:15 PM
black prince black prince is offline
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@jackl,

Jackl wrote:
Quote:
have enabled audio & video encoding in the template (possible prob?)
Yep!. That's a problem. Set Tmpgenc to "ES video only". By combining
audio, you have thrown the formula off big time. Look at the Sticky
in this forum for "Mini Guide - How to perfrom File Prediction"

-black prince
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  #3  
01-17-2003, 08:56 PM
jackl jackl is offline
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@Black Prince

I'm encoding the samples with System (Video Only). Must have missed a post on this setup, but was sure System & ES video were close. I'll run another sample... Thanks
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  #4  
01-17-2003, 09:10 PM
Daagar Daagar is offline
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No, if you use System you are adding in extra overhead for the VCD format, whereas the 'ES' setting gives you just the 'elementary stream' (ie., the movie without the VCD format overhead). Doing prediction against System will cause you to lose a lot of potential quality (not to mention the fact it'll be flat out wrong... your final movie will always wind up not filling the whole CD).
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  #5  
01-17-2003, 09:27 PM
jackl jackl is offline
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Just run the new sample with ES video only.

Sample size now = 13.2M
Predicted size = 878M
Actual size still = 765M

Ding! The light may have just struck... When doing a final encode, I'm now assuming (risky!) that I should NOT use the Wizards but go direct from the front panel of TMPG using ES video and then mux in the audio? If so I'll have to do a full encode tonight.
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  #6  
01-17-2003, 10:02 PM
SansGrip SansGrip is offline
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Quote:
Originally Posted by jackl
I should NOT use the Wizards but go direct from the front panel of TMPG using ES video and then mux in the audio?
Yep. We've evolved beyond wizards here .
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