Quantcast KDVD: Max Bitrate Allowed? - digitalFAQ.com Forums [Archives]
  #1  
05-29-2004, 09:52 AM
zagor zagor is offline
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for mistaken, I have used bitrate maximum of 2500 in cce instead of 5000.
it is the same or there is any difference?

thankx
by
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  #2  
05-29-2004, 02:18 PM
kwag kwag is offline
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You'll have a blocky picture on high action scenes.

-kwag
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  #3  
06-06-2004, 04:09 PM
J-Wo J-Wo is offline
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I've been using a max bitrate of 4500-5500 for KDVDs from DVD source when I want to preserve high quality. Kwag, is this large enough? I was just checking the info on one of my DVDs (Kill Bill) and read that it has 3368 avg, 9800 max bitrate. If my goal is simply to compress a DVD-9 onto a DVD-5 disc, how high can i set max bitrate in CCE to preserve quality?
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  #4  
06-06-2004, 04:14 PM
Dialhot Dialhot is offline
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Quote:
Originally Posted by J-Wo
Kwag, is this large enough?
(imitating Kwag's voice) Yes it is with Notch-KVCD Matrix.
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  #5  
06-06-2004, 04:56 PM
J-Wo J-Wo is offline
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Cool. I've always wondered this but... how is all this magic possible? What is the magical "KVCD Notch Matrix" and what makes it so special compared to the normal matrix? A simple, short explaination will suffice!
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  #6  
06-06-2004, 05:02 PM
kwag kwag is offline
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Quote:
Originally Posted by J-Wo
and what makes it so special compared to the normal matrix?
Magic

-kwag
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  #7  
06-06-2004, 05:06 PM
jorel jorel is offline
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J-Wo
i'm using min800 & max8000, Q~25 in CCE to put 2 movies in one Kdvd and each movie have round 90/100 minutes !

ah....A simple, short explaination will suffice?
because KVCD notch matrix do miracles...of course, wait better explanations(if someone can explain that miracle)!
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  #8  
06-06-2004, 05:16 PM
J-Wo J-Wo is offline
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Well, I guess if ya ask a silly question...

so is max8000 too high, or in other words a waste of bitrate? My goal for KDVDs is to not be able to tell the movie has been reencoded at all, so if boosting my max bitrate from 5500 to something more would do that I'd love to know. sometimes I encode at Q=5 in CCE to try and take up more space when a movie seems highly compressible, but I don't know if that makes a difference or not.
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  #9  
06-06-2004, 05:23 PM
incredible incredible is offline
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Quote:
Originally Posted by kwag
Quote:
Originally Posted by J-Wo
and what makes it so special compared to the normal matrix?
Magic

-kwag
"Nic" would say "the medium of dance"
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  #10  
06-06-2004, 05:26 PM
jorel jorel is offline
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well i post my little experience and the result of my tests...but you can believe,i'm really bored about audio and video quality.
think in min/max bitrate at the right side of the balance, and Q in the left side. the important is the "perfect" balance between the parameters.
use 3 multipasses vbr with KVCD notch matrix, Q25, Min800 Max8000 for round 200 minutes of movie and you will see what i get!
...and more:
with one original AC3 track from the dvd without reencode!
script?...don't need to post, need?
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  #11  
06-06-2004, 05:54 PM
kwag kwag is offline
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Quote:
Originally Posted by J-Wo
Well, I guess if ya ask a silly question...
Not silly at all
Here's your straight answer: The KVCD Matrix increases the video compression in a way similar to how an MP3 audio encoder works. MP3's discard frequencies that the ear can't hear. For example, when you have two frequencies very close to each other, but one of the frequencies is many decibels (DBs) below the other, the lower level frequency can be discarded, because the human ear can't distinguish it. The higher level frequency takes precedence.
Electronically, you can see the frequencies on an oscilloscope. But a person can't tell the difference by ear. Of course, a person can tell the difference if the frequencies are further apart from each other, or if their power levels are close to each other. Those are the main key point for discarding the frequencies. Separation and power ratio between the frequencies, to decide which to discard.
Now apply that to the eye, and you have a similar effect with MPEG video, and that's what the KVCD matrix does. Plus I added the extra "Notch" touch, unexistant on any other matrix and never even defined by the MPEG group, and that pattern is what takes care of killing the low lit MPEG DCT dancing blocks.
So there you have it

-kwag
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  #12  
06-06-2004, 06:40 PM
J-Wo J-Wo is offline
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interesting, good explanation kwag. So if I want to preserve quality should I stick with a max bitrate of 5500, or go higher/lower?
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  #13  
06-06-2004, 07:04 PM
kwag kwag is offline
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Quote:
Originally Posted by J-Wo
interesting, good explanation kwag. So if I want to preserve quality should I stick with a max bitrate of 5500, or go higher/lower?
I would use 6,000Kbps MAX. That high enough.
If you want top quality on an extreme action movie, use ~7,500 MAX.

-kwag
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