Quantcast What is Interlaced Video? What is Pulldown? - digitalFAQ.com Forums [Archives]
  #1  
06-10-2004, 07:54 AM
khusru khusru is offline
Free Member
 
Join Date: Jan 2004
Location: Southgate, North London
Posts: 263
Thanks: 0
Thanked 0 Times in 0 Posts
some very silly questions, but honestly i dont know the answers and would like to know as they are very basic things

1.what is interlaced video? and whats the difference between interlaced and de-interlaced?

2. what is pulldown (e.g3:2 pulldown) and what does it do?
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
  #2  
06-10-2004, 10:13 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
A's:

1.
http://www.kvcd.net/forum/viewtopic.php?t=9808

2.

A 23.976 progressive source where most of the "movies" are shot on, cant be interpreted by a NTSC TV set directly as NTSC TV is showed at 29.97 interlaced.

So how can we get that 23.976 progressive to 29.97 interlaced?

Here I do quote the german "exotic interlacing" guide from Scharfis_brain

Code:
Filmframe     A   B   C  D   E   F   G  H   I    J  K
Videofield1   A  B  B  C  D  E  F  F  G  H  I  J  J  K
Pairs          |  |/  /  /|   |  |/  /  /|   |  |/  /
Videofield2    A  B  C  D  D  E  F  G  H  H  I  J  K  L
Time        --p--p--i--i--p--p--p--i--i--p--p--p--i--i->
Means, fields will be doubled and field shifted, and thats why a 29.97 comes out and why finally its combed (cause of dynamical field shifts).

You can do that with avisynth, BUT that would mean you also need to encode at 29.97 which in a case of real 23.976 sources WE DO NOT DO!

But we do keep 23.976 when encoding and the encoder applies a little information to the encoded stream which does say to the saplayer that the saplayer should perform that 3:2 Pulldown internally before sending it to the TVset. And thats called in TmpgEnc "Pulldown while play" or if cce or mencoder is used we do add to that 23.976 encoding the info afterwards using "pulldown.exe"
Reply With Quote
  #3  
06-10-2004, 12:33 PM
khusru khusru is offline
Free Member
 
Join Date: Jan 2004
Location: Southgate, North London
Posts: 263
Thanks: 0
Thanked 0 Times in 0 Posts
thanks pal, got it
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
how to do video Pulldown? mma01 Video Encoding and Conversion 6 06-19-2005 09:38 AM
Duvida com o framerate... do video apos o pulldown e o som.. Legendary Conversão e Codificação de Vídeo (Português) 3 08-23-2004 08:25 AM
Encoding NTSC Interlaced Fullscreen Video? DanoSaurus Video Encoding and Conversion 17 01-15-2004 02:30 PM
Recording Video: Is it interlaced? Greig Video Capturing / Recording 3 09-25-2003 12:42 AM
Pulldown=audio e video fora de sincronismo mcmagoobr Conversão e Codificação de Vídeo (Português) 0 09-13-2003 01:27 AM

Thread Tools



 
All times are GMT -5. The time now is 09:28 AM  —  vBulletin © Jelsoft Enterprises Ltd