Quantcast GOP Standards for PAL and NTSC Players? - Page 2 - digitalFAQ.com Forums [Archives]
  #21  
12-13-2003, 09:52 AM
ARAGORN ARAGORN is offline
Free Member
 
Join Date: Oct 2002
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
For me kvcd works at 704x576 mpeg1, gop 25 on a dvd. Authored with tmpgenc dvd author. I've just made the test. I've tried also 480x576 with dvd lab and it works too. I can put easily 5 movies on a dvd. That's great
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  
12-13-2003, 10:21 AM
Dialhot Dialhot is offline
Free Member
 
Join Date: May 2003
Posts: 10,463
Thanks: 0
Thanked 0 Times in 0 Posts
What standalone do you have Aragorn ?
Reply With Quote
  #23  
12-13-2003, 10:34 AM
ARAGORN ARAGORN is offline
Free Member
 
Join Date: Oct 2002
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
I've got a philips dvd 955. I've bought it 3 years ago.
Reply With Quote
  #24  
12-13-2003, 05:18 PM
russiansexpat russiansexpat is offline
Free Member
 
Join Date: Nov 2003
Posts: 123
Thanks: 0
Thanked 0 Times in 0 Posts
I think that GOP is related to processing power of decoder
(hardware or software) and also to video buffer size,
and this one is more important.
As it mentioned already, nowdays standalone players are capabale to porocess GOPs over 25 (of course the quality depends also on sequience IPB type frames), but players have certain limitations on video buffer size.
So the question is - how many frames buffer holds?
The reason I am asking this because I can specify video buffer size in encoding and also it is specified in multiplexing.
Reading the thread while getting buffer underruns:
http://thread.gmane.org/gmane.comp.v...yer.user/22839
__________________
are you ready for year 2038?
x+2038-1970 > (2^31+1)/(365.25*24*3600)
/dev/mem < /dev/null
Reply With Quote
  #25  
12-17-2003, 08:16 AM
Dialhot Dialhot is offline
Free Member
 
Join Date: May 2003
Posts: 10,463
Thanks: 0
Thanked 0 Times in 0 Posts
I just want to say that I did my first try on DVD-RW yesterday and my pioneer DV454 accepts a KDVD done with my "old" videos I did for KVCD.

In other words : a MPEG1 352*240 GOP24 video authored with TMPGENC DVD Author is read without any problem !

I do not try yet with higher resolutions.

Note: TMPGENC Author took 40 minutes to make a DVD image of 583 Mb !!! Is that normal ?
(96% of the CPU was use doruing all the process - I have a P4 1.4Ghz).
Reply With Quote
  #26  
12-19-2003, 12:28 AM
russiansexpat russiansexpat is offline
Free Member
 
Join Date: Nov 2003
Posts: 123
Thanks: 0
Thanked 0 Times in 0 Posts
Returning to the question: how large video buffer can be?

Current windoze encoders suggested 40KB for VCD, 112KB for SVCD, 224KB for DVD and mentioned that these values are minimum. How these arbitrary figures sneaked into encoding procedures and source code?

Video buffer size is closely connected to bitrate control and maximum GOP.
__________________
are you ready for year 2038?
x+2038-1970 > (2^31+1)/(365.25*24*3600)
/dev/mem < /dev/null
Reply With Quote
  #27  
12-19-2003, 04:31 AM
incredible incredible is offline
Free Member
 
Join Date: May 2003
Location: Germany
Posts: 3,189
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via ICQ to incredible
Quote:
Originally Posted by Dialhot
Note: TMPGENC Author took 40 minutes to make a DVD image of 583 Mb !!! Is that normal ?
(96% of the CPU was use doruing all the process - I have a P4 1.4Ghz).
In regular TmpgEnc DVD Author as any other Authoring programm doesn't need that much cpu power, its more a HD power thing.
But as your KVCDs in regular come with a 44.1khz sound, TmpgEnc DVD Author got an automatic resample engine, this option is viewable at the sound input field ... so your sound will be resampled to 48khz.
And thats another issue: If the Quality by doing this could suffer. Cause if you go in with a 44.1khz 112kbit Audio this will be resamled at 48khz 112kbit (as I know) = Quality loss in audio. ?! We should figure that out.

Did you only choose one movie to burn on cd for testing or did you put several KVCD based tracks in one project??
EDIT: Yes you did as I re-read your post again ..
Reply With Quote
  #28  
12-19-2003, 06:48 AM
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 incredible
In regular TmpgEnc DVD Author as any other Authoring programm doesn't need that much cpu power, its more a HD power thing
That's also what I was thinking. But with my 120GB/7200rpm/8Mo memory HD, that shouldn't be a problem

Quote:
But as your KVCDs in regular come with a 44.1khz sound, TmpgEnc DVD Author got an automatic resample engine, this option is viewable at the sound input field ... so your sound will be resampled to 48khz.
Okay ! I didn't think about that. That's sure that for at least one of the track the sound was in 44.1 because it was a regular VCD (I made a DVD with 2 tracks : one regular VCD and a KVCD).

Quote:
Audio this will be resamled at 48khz 112kbit (as I know) = Quality loss in audio. ?! We should figure that out.
You can't resample a compressed audio. You have to decode/resample/reencode. And as mp2 isn't a lossless format, for sure the quality suffer a little.

Quote:
Did you only choose one movie to burn on cd for testing or did you put several KVCD based tracks in one project??
I just answered to that above
Reply With Quote
  #29  
12-19-2003, 06:57 AM
incredible incredible is offline
Free Member
 
Join Date: May 2003
Location: Germany
Posts: 3,189
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via ICQ to incredible
Quote:
Originally Posted by Dialhot
Quote:
Originally Posted by incredible
Audio this will be resamled at 48khz 112kbit (as I know) = Quality loss in audio. ?! We should figure that out.
You can't resample a compressed audio. You have to decode/resample/reencode. And as mp2 isn't a lossless format, for sure the quality suffer a little.
I know, but there are differences in resampling engines and so lets see if it would be better to let do besweet the decode/resample/reencode way or if it also will come out in a smae quality if TmpgEncDVD Author reencodes it.
But anyhow "decode/resample/reencode" a 112kbit or even a 128kbit, .... oh oh ... and I think 95% of all encoded KVCDs around the globe do got 128kbit or below that. And so I think in case of re-authoring already made KVCDs to DVD we should use Bewseet to "reencode" that existing mpeg2 to at least 160kbit and do a comparison. Thats what I meant.
Reply With Quote
  #30  
12-19-2003, 07:06 AM
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 incredible
I know, but there are differences in resampling engines and so lets see if it would be better to let do besweet the decode/resample/reencode way or if it also will come out if TmpgEncDVD Author reencodes it.
As I already do not trust tmpgenc audio engine, I won't either trust the one in tmgenc author (I guess it's the same !).
So I think about using besweet for that. And you're surely right : it's a good idea to do the new file in 160. This way the loses will be lesser than if we reencode in 128.
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
DVD NTSC 29.970fps A KSVCD NTSC 23.976fps <-ESCENAS NEGRA centella Convertir y Codificar Video (Español) 2 09-06-2004 02:44 PM
DVD\WMP Compatible players? ovg64 Players, DVRs, Media Centers 2 05-30-2003 12:54 PM
KVCD: PAl to NTSC? have to convert them to NTSC before encoding? WhiteKnight54 Video Encoding and Conversion 2 12-18-2002 10:32 PM
KVCD: How to convert from NTSC 23.xxx to PAL or NTSC 29.xxx StevetheSwede Video Encoding and Conversion 0 09-18-2002 09:23 AM
Portable VCD and Mp3 players? digitalvideo Players, DVRs, Media Centers 12 06-18-2002 01:55 PM

Thread Tools



 
All times are GMT -5. The time now is 05:22 PM  —  vBulletin © Jelsoft Enterprises Ltd