digitalFAQ.com Forums [Archives] - How do I use CQMatic to predict size for KDVD 720x480?

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- - How do I use CQMatic to predict size for KDVD 720x480? (http://www.digitalfaq.com/archives/encode/4657-how-cqmatic-predict.html)

Quote:

Originally Posted by SodGawd

@Kwag

Quote:

If you're using the regular script for 2.0x, then only adjust your MIN. Like MIN=(0.75*AverageBitrate).
You can only lower the MAX if you use the Motion Adaptive script for AviSynth 2.5x.

Ok.. I do have a question regarding this.. I used DVDRHELP's Bitrate Calculator and used MovieStacker's. I noticed that MS's is AVERAGE and DVDRHELP's is CALCULATED. Bare with me here... MS stated that with a 68min 34sec movie (target file size is 1400MB) on 2 80min discs is averaged at 3005. You then multiply that by .75 (3005 x .75= 2253.75). This is now going to be you MIN bitrate, correct?

In DVDRHELP's calculator, I am in advanced mode. I key in my time 1 hour 8min 34sec (or 68min 34sec). I then choose DVD under the disc type (since I am making a KDVD). I then choose custom for my disc size and enter in 1400MB for size. Then I choose my audio bitrate of 192. I did notice that you cannot change the MAX bitrate to 5000 (I have AviSynth 2.08 so no MA script for me). It calculates the bitrate at 2548.

Which do I use?? Should I be using the XVCD setting instead or DVD??

MovieStacker is in badly need of updating (which is EZ for me to say since I am not the one coding it). It does need to have a setting for KDVD as well, instead of just KVCDs. :D

Try this: ~Total video size in KB = ( AverageBitrate in kilobits / 8 ) * 60 * movie time in minutes

Plus a small overhead, depending what you're going to burn (DVD ~25MB, VCD ~10MB )

See which is closer :)

-kwag

Please post your results for all this. I'm also working with KDVD (to make CDVD and DVD muxed SVCD's). Prediction has always been a problem and Kwag's new toy looks like it can be a winner. The need to use 700 per disk rather than 800 in BBMPEG is also a problem for me.

Quote:

Originally Posted by kwag

Quote:

Originally Posted by SodGawd

@Kwag

Quote:

If you're using the regular script for 2.0x, then only adjust your MIN. Like MIN=(0.75*AverageBitrate).
You can only lower the MAX if you use the Motion Adaptive script for AviSynth 2.5x.

Kwag, testing 1.0b7

When I processed the film originally, sample predicted CQ 82.5. Final mpg results from BBMPEG muxed as DVD with 699 output size was 714 meg and 685 meg files. 699 files allow either burning as SVCD in Nero or authoring in TMPGEnc Author and burning as image files.

Source (DVD Video): 98:31 Minutes / 141,788 Frames 16:9
(DVD Audio): 1,108,495 Wav / 92,375 mp2 @ 128 Headac3he

Total video size in KB = ( AverageBitrate in kilobits / 8 ) * 60 * movie time in minutes

1400 – 92 (mp2) – 25 (Authoring) = 1283

1283 = (1728/8) * 60 *99

Set Minimum TMPGEnc bitrate at ( 1728 * .57 ) = 985, Left Maximum Bitrate at 5000

CQMatic: Movie Time in Minutes = 99
Average Bitrate = 1728

First Pass: 70 Difference 1.259099
Second Pass: 79.07 Difference 1.098573
Third Pass : 86.86 Difference .0891835
Fourth Pass : 82.97 Difference 1.006583
Fifth Pass: 83.51

Resulted in m2v file of 1,352,960, not approx 1,283,000

Notes:

Each pass took approx 15 minutes with 2.53 GHz P4 with Windowsxp and Ultra DMA dirve

Used 2.0x Optimum Template

Saved from DVD2AVI without Force Film ( used telecide() & decimate() in AVS script.

Template:

MPEG2Source("C:\Documents and Settings\Owner\Desktop\capture\bas\bas.d2v")
telecide()
decimate()
LegalClip()
unfilter(50,50)
GripCrop( 720,480 )
GripSize(resizer="BicubicResize")
STMedianFilter(8, 32, 0, 0, 8, 32)
# SpaceDust() # Optional - for some "not so clean" DVDs.
temporalsmoother(1,2)
mergechroma(blur(1.50))
mergeluma(blur(0.1))
# Convolution3d or DCTFilter for extreme worse cases.
GripBorders()
LetterBox(16, 16, 16, 16)
LegalClip()
#Sampler(length=24)
##MPEG size = ((Total frames/MovieTimeInMinutes)/24) * MPEG sample file size