Quantcast New 10 % Prediction Method ? - digitalFAQ.com Forums [Archives]
  #1  
03-02-2003, 06:31 PM
hedix hedix is offline
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I think I have to put these lines at the end of my script
Code:
oldfps = framerate 
AssumeFps(oldfps * 10) 
Sampler(length=24) 
AssumeFps(oldfps)
Is this correct ?

Thank you in advance
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  #2  
03-02-2003, 06:35 PM
kwag kwag is offline
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That will sure work

-kwag
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  #3  
03-02-2003, 06:50 PM
hedix hedix is offline
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Hey Kwag, you are the quickest !!!

I have done some tests, and I got this

fps x 20 , CQ=79.571 , 4 tries
fps x 10 , CQ=67.125, 3 tries
fps x 5 , CQ=72.020, 5 tries
fps x 1 , CQ=71.075, 3 tries

Edit: fps x 2, CQ=68.450, 4 tries

film was spanish "El 6º día", Arnold Swatzeneger, cloning ...

What's your opinion ?
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  #4  
03-02-2003, 07:03 PM
kwag kwag is offline
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Quote:
Originally Posted by hedix
Hey Kwag, you are the quickest !!!

I have done some tests, and I got this

fps x 20 , CQ=79.571 , 4 tries
fps x 10 , CQ=67.125, 3 tries
fps x 5 , CQ=72.020, 5 tries
fps x 1 , CQ=71.075, 3 tries

film was (spanish "El 6º día", Arnold Swatzeneger, clones ...)

What's your opinion ?
Run a full sampler, and when you get the wanted file size, see what CQ was needed and to what CQ is closest on one of the four CQs above

-kwag
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  #5  
03-02-2003, 07:08 PM
hedix hedix is offline
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Quote:
Originally Posted by kwag
Run a full sampler, and when you get the wanted file size, see what CQ was needed and to what CQ is closest on one of the four CQs above
What's a full sampler? Do you mean
Code:
Sampler(24) ?
For me is the same than "fps x 1". You know, the "fps x 10" is your 10% prediction, my "fps x5" would be a 20% prediction, and so on.

Regards
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  #6  
03-02-2003, 07:11 PM
hedix hedix is offline
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Ops...

On the 10 % prediction, I have to do :

Samplesize*10, or is there any other factor implied ?
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  #7  
03-02-2003, 07:18 PM
kwag kwag is offline
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Hi hedix,

The 10% thing is really to try to find a close CQ in many short runs. But then, a full sampler must be run. The rule is simple: The more samples taken, the more accurate the prediction. If you could start your prediction with 5% samples, and then when you get to ~3% of final size, switch to full sampler. That's the way it should work. This way, you probably run three to five 5% samplers, and then you switch to full sampler. Then it should be just one or two tries to hit final wanted file size.

-kwag
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  #8  
03-02-2003, 07:26 PM
hedix hedix is offline
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OK, Kwag.

I will try to implement it on ToK, and I will tell you on 3-4 days.

Thank you.
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  #9  
03-02-2003, 08:11 PM
jorel jorel is offline
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Quote:
Originally Posted by hedix
OK, Kwag.

I will try to implement it on ToK, and I will tell you on 3-4 days.

Thank you.
3-4 days?

i can't wait .

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  #10  
03-04-2003, 07:27 AM
hedix hedix is offline
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Hi,

The thing is working, but I'm not plenty satisfied with the result.

I think a very important thing is the initial CQ. I know It depends on the resolution, the length and the type of movie.

Could we get a formula with (aproximated) values ? Something like:

CalcResolution=Height*Width
EstimatedCQ=fx(CalcResolution,length,typeOfFilm)

Obviously, let the user choose the typeOfFilm on the program. Computers are not so smart, by now

Regards
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