Quantcast KDVD\KVCD Official Specifications - digitalFAQ.com Forums [Archives]
  #1  
09-17-2005, 09:51 PM
supermule supermule is offline
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Hi Kwang,

Digging deep inside some A/V sites, I found this, written by you somewhere in the mid of 2003 :

Code:
KVCD Official Specifications: ( Audio specifications are not defined ) 

The core of KVCD is a propietary modification to the standard MPEG-1 and MPEG-2 Quantization Matrix. The official KVCD resolution is 528x480( 576 ). This is labeled KVCDx3. Also 544x480( 576 ) is defined as an alternate resolution, labeled KVCDx3A. 
The KVCD "Notch" Quantization matrix may be used on any hardware or software encoder capable of accepting custom tailored matrixes. 
It is optimized for space/quality, and has also been optimized to reduce visible DCT blocks on low lit/dark scenes. 
The KVCD "Notch" Quantization Matrix is Copyright (c) 2002, 2003 of Softronex Corporation. It may be used freely on any product, but it must be clearly stated that the matrix in use is "KVCD "Notch" Quantization Matrix". There are no other restrictions on it's use. 

Here is the byte code for the KVCD "Notch" Quantization Matrix: 

Intra: 
8 9 12 22 26 27 29 34 
9 10 14 26 27 29 34 37 
12 14 18 27 29 34 37 38 
22 26 27 31 36 37 38 40 
26 27 29 36 39 38 40 48 
27 29 34 37 38 40 48 58 
29 34 37 38 40 48 58 69 
34 37 38 40 48 58 69 79 
NonIntra: 
16 18 20 22 24 26 28 30 
18 20 22 24 26 28 30 32 
20 22 24 26 28 30 32 34 
22 24 26 30 32 32 34 36 
24 26 28 32 34 34 36 38 
26 28 30 32 34 36 38 40 
28 30 32 34 36 38 42 42 
30 32 34 36 38 40 42 44 


Optional Recommendations: 

For optimal encoding on natural material ( movies, new computer generated films ), we recommend to match the KVCD "Notch" Quantization Matrix with a maximum GOP size of 24 pictures for NTSCFilm (23.976fps), 25 pictures for PAL (25fps) or 30 pictures for NTSC (29.97fps). 
For animation, old cartoons, etc., we recommend a maximum GOP size of 12 pictures for NTSCFilm (23.973fps), 15 pictures for PAL (25fps) and 18 pictures for NTSC (29.97fps). 
It's also recommended to set "Scene change detection", if the encoder permits. 
Also, use open GOP. 
There are no preferences as to the type of encoding ( CQ, CQ_VBR, X-PASS, etc. ). Use the best mode that your encoder can produce. 
Suggested bitrates are a minimum of 64Kbps and a maximum of 3,000Kbps. 
For MPEG-1 and MPEG-2 in this bitrate range, a DC component precision of 8 bits is recommended. 

DVD Compliance: 

For DVD compliant MPEG files, select the standard DVD parameters for your encoder, but change (modify, patch, etc.) the matrix on your encoder to use the KVCD "Notch" Quantization Matrix. This will enable play times of ~6 hours on a 4.7GB DVD(+-)R(W) media at a standard resolution of 720x480(576 ) Full D-1, Wide Screen encodes, or ~10 hours at a resolution of 352x480( 576 ) Half D-1. 

( Specifications subject to change without notice ) 
Copyright© 2002, 2003 Softronex Corporation. All Rights Reserved.
But I searched the "Official Forums" but couldnt find anything of this sort now. The Optional recommendations are quite helpful for newbies.

Is there an updated version of this, or is it that these have changed over time and are now ruled solely by the templates ??? .
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Someday, 12:01 PM
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  #2  
09-17-2005, 09:56 PM
kwag kwag is offline
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Quote:
Originally Posted by supermule
But I searched the "Official Forums" but couldnt find anything of this sort now. The Optional recommendations are quite helpful for newbies.
You probably missed this link
http://www.kvcd.net/portal/articles.php?lng=en&pg=20

-kwag
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  #3  
09-18-2005, 12:06 AM
supermule supermule is offline
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Quote:
Originally Posted by kwag
Quote:
Originally Posted by supermule
But I searched the "Official Forums" but couldnt find anything of this sort now. The Optional recommendations are quite helpful for newbies.
You probably missed this link
http://www.kvcd.net/portal/articles.php?lng=en&pg=20

-kwag
Oops! indeed, I did miss it............!!!!
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