Digital Video Forums  

Go Back   Digital Video Forums > Other > Archive (Closed) > Archived Posts > DivX/XviD Conversion/Encoding

 
 
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
Old 22 Oct 2002, 07:26 PM   #1
Junior Member
Junior Member
 
Join Date: Jun 2002
Posts: 27
Default I think I understand Force Film/IVTC - Please verify...

I think I understand Force Film & IVTC, please can you let me know if I'm correct on the following points...

* Some movies are stored on DVD in a FILM format at 24fps. When played on a NTSC DVD player these are speeded up to 29.760fps using a method called 3:2 pulldown.

* Therefore in DVD2AVI if a movie is displayed as FILM or FILM 95%+ then we should use the FORCE FILM option which will alter the frame rate to 23.976fps.

* Some movies are stored on NTSC DVD's at 29.760fps and these show up as NTSC in Avisynth. We should use IVTC, not FORCE FILM, with these movies to reduce the framerate to 23.976.

* If we use FORCE FILM on a movie where IVTC should have been used, we'll notice interlacing artifacts in the playback.

* But confusingly... Gordian Knot warns that IVTC should only be used as a last resort. So I've tried FORCE FILM on movies that are shown as NTSC in DVD2AVI and they came out fine!

* Perhaps the answer is to always use FORCE FILM first, and if problems arise then go back and do IVTC??
Boathouse is offline  
Old 22 Oct 2002, 07:52 PM   #2
Old member
 
Join Date: Feb 2002
Posts: 5,417
Default

I have always preferred doing IVTC using TMPGEnc and more recently, GK 0.26. They work perfectly with all sorts of NTSC materials and somehow the framerate is converted into better (more correct) figures (23.97fps compared to DVD2AVI's 24.00fps).
Enchanter is offline  
Old 26 Oct 2002, 01:24 AM   #3
Member
Member
 
Join Date: Aug 2002
Posts: 58
Thumbs up

There is a very good article at doom9.org explaining ntsc, pal, ivtc, forced film etc.. also when to use forced film and when to use ivtc and when to use deinterlace etc.

I can't remember the exact adress, but i think it's definitly worth a read.

Robert
De Joker is offline  
Old 26 Oct 2002, 03:40 AM   #4
khp
The Other
 
khp's Avatar
 
Join Date: Nov 2001
Location: Online
Posts: 2,161
Default

http://www.doom9.org/ivtc-tut.htm
__________________
Donate your idle CPU time for something usefull.
http://folding.stanford.edu/
khp is offline  
 

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are Off




All times are GMT +10. The time now is 03:10 AM.

Kirsch designed by Andrew & Austin


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright © 1999 - 2018 Digital Digest

Visit DivXLand   Visit dvdloc8.com