Quantcast KVCD: Encode with Constant Bitrate, Load .AVS File, Change Resolution? - Page 2 - digitalFAQ.com Forums [Archives]
  #21  
09-14-2003, 05:02 PM
Dialhot Dialhot is offline
Free Member
 
Join Date: May 2003
Posts: 10,463
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Edlund
So I will have to do a test with a 2 hours movie and maybe I'll have to stick with CQ for bigger movies but use my method for movies up to 90 minutes.
For instance, yes.
Reply With Quote
Someday, 12:01 PM
admin's Avatar
Site Staff / Ad Manager
 
Join Date: Dec 2002
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
  #22  
09-14-2003, 06:10 PM
kwag kwag is offline
Free Member
 
Join Date: Apr 2002
Location: Puerto Rico, USA
Posts: 13,537
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by jorel
"not so bad" is a girl with wonderful body and ugly face!
"horrible" is a girl.....horrible..."everything"!

Ever heard of a WOW / Damm girl
When you see them from behind, you say WOW
When they turn their face towards you, you say DAMN

Reply With Quote
  #23  
09-15-2003, 07:04 AM
Edlund Edlund is offline
Free Member
 
Join Date: Jul 2003
Location: Pazardjik, Bulgaria
Posts: 147
Thanks: 0
Thanked 0 Times in 0 Posts
Kwag, can you tell me what should I change to the original KVCD templates (for example KVCDx3 ntsc) if I use constant bitrate? I changed the GOP to 18 but I'm not sure that this is everything.
Reply With Quote
  #24  
09-15-2003, 11:03 AM
kwag kwag is offline
Free Member
 
Join Date: Apr 2002
Location: Puerto Rico, USA
Posts: 13,537
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Edlund
Kwag, can you tell me what should I change to the original KVCD templates (for example KVCDx3 ntsc) if I use constant bitrate? I changed the GOP to 18 but I'm not sure that this is everything.
You should use the standard MPEG matrix if you are using constant bitrate.
The matrix ("Notch") is designed to work with variable bitrate, and take compression to it's advantage. So you'll get better results setting the standard matrix. Also, the GOP shouldn't be too long, and a value of 18 should be about the largest value for a CBR encode.
If you insist on using CBR, because you don't want to do prediction, then may I suggest something?
Instead of using 1,150Kbps, use 1,450Kbps MAX and 300Kbps MIN and use MVBR mode.
This will give you better quality that ANY CBR VCD, and still, I'm alost 100% sure that it will give you 80+ minutes on one CD-R. The trick is the low bitrate on MIN, which is way below the MAX.
So for 1 hour TV series, you can almost be sure that you'll always fit it on one CD, probably with a lot of space left. This way, you can use KVDC's "Notch" matrix, and a GOP of 24.
This settings are excelent for 352x240. If you are going to encode at higher resolutions, then the MAX bitrate of 1,450Kbps will not help you, and you'll get blocks on high action scenes.

Edit: For KVCDx3, you'll need AT LEAST 2,000Kbps MAX bitrate for a descent picture (Using the MA script ), and don't expect more than ~45 minutes per CD-R.


-kwag
Reply With Quote
  #25  
09-15-2003, 11:15 AM
Edlund Edlund is offline
Free Member
 
Join Date: Jul 2003
Location: Pazardjik, Bulgaria
Posts: 147
Thanks: 0
Thanked 0 Times in 0 Posts
Thank you very much, Kwag
Reply With Quote
  #26  
09-15-2003, 02:38 PM
Dano Dano is offline
Free Member
 
Join Date: Apr 2003
Location: Brockton, MA
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
I use mpeg-1 CBR of ~2400kbps on my captures of TV episodes. Running prediction on a file that is always going to end up wih an average bitrate that is about 100kbps less than my max doesn't make sense. I know I could raise my max bitrate to say 3000 or 3500 so as to help in high acion scenes but, the MA script already takes care of this, it sort of does in filtering what an encoder does with vbr.
__________________
-Dano
Reply With Quote
  #27  
09-15-2003, 03:03 PM
Jellygoose Jellygoose is offline
Free Member
 
Join Date: Jun 2002
Location: Germany
Posts: 1,288
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Dano
[...] but, the MA script already takes care of this, it sort of does in filtering what an encoder does with vbr.
Sorry, but that is just not right.
MA filtering in our case only allows the encoder to use a lower bitrate for high action scenes, without a visible degredation in quality by blurring the picture. That's the purpose of the MA script, so it would make absolutely no sense to use a high CBR together with the MA script, as it will only degrade quality of high action scenes, and will not lead to a better compression for that scene!
__________________
j3llyG0053
Reply With Quote
  #28  
09-15-2003, 04:55 PM
Dano Dano is offline
Free Member
 
Join Date: Apr 2003
Location: Brockton, MA
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
The types of scifi tv shows that I capture have lots of action, explosions, and stroboscobic effects that come out looking terrible at less than DVD bitrates. The MA script helps a lot since I usually encode at 704x480. Perhaps I should analyze the captures individually and adjust my scripts accordingly, any tips would be welcome. My sources are hardware encoded mpeg-2 captures at between 8 to 10 Mbps CBR and each episode is encoded to one CD at about 42 to 44 minutes per disc. Thanks in advance.
__________________
-Dano
Reply With Quote
  #29  
09-16-2003, 10:44 AM
Jellygoose Jellygoose is offline
Free Member
 
Join Date: Jun 2002
Location: Germany
Posts: 1,288
Thanks: 0
Thanked 0 Times in 0 Posts
Well that's exactly what I said, if your play-time per media is at only 45 minutes, of course you're able to have a great quality EVEN in CBR encodes at 704x480.
Well now try the same captured clip in CQ mode, with prediction and everything and the MA routine, and you'll be amazed by the quality.
It's just logical thinking that it has to be better, because the high bitrates are used in those parts of the movie where they're needed...
That's my tip!
__________________
j3llyG0053
Reply With Quote
  #30  
09-17-2003, 04:28 AM
Edlund Edlund is offline
Free Member
 
Join Date: Jul 2003
Location: Pazardjik, Bulgaria
Posts: 147
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Jellygoose
MA filtering in our case only allows the encoder to use a lower bitrate for high action scenes, without a visible degredation in quality by blurring the picture.
This sounds good.
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
DVD Constant bitrate or CQ? khusru Video Encoding and Conversion 8 02-24-2004 02:06 PM
KVCD: How to Change resolution? Wolfi Video Encoding and Conversion 9 11-01-2003 10:22 AM
KVCD: What happens if I change the resolution? AgNa Video Encoding and Conversion 3 02-09-2003 12:02 AM
KVCD: Kvcdx3 file is big - Change quality setting or resolution? dynokeith Video Encoding and Conversion 1 11-24-2002 04:45 PM
KVCD: Audio bitrate change for pal? dredlox Video Encoding and Conversion 0 06-27-2002 07:48 AM

Thread Tools



 
All times are GMT -5. The time now is 02:45 PM  —  vBulletin Jelsoft Enterprises Ltd