Digital Video Forums  

Go Back   Digital Video Forums > Video File Formats > AVI, DivX/Xvid

Reply
 
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
Old 30 Nov 2002, 04:40 AM   #1
Member
Member
 
Join Date: Aug 2002
Posts: 58
Question Forced film or IVTC

Is there a difference in quality between using forced film and using IVTC, if both can be used. The reason i'm asking is because i have seen alot of movies lately that can be both forced filmed and IVTCed, but the method with forced film is alot faster.

Thanks, Robert
De Joker is offline   Reply With Quote
Old 30 Nov 2002, 05:55 AM   #2
khp
The Other
 
khp's Avatar
 
Join Date: Nov 2001
Location: Online
Posts: 2,161
Default

I think that forcefilm will give you better quality, if it can be used. There is always a chance that IVTC will be done incorrectly in some frames.
__________________
Donate your idle CPU time for something usefull.
http://folding.stanford.edu/
khp is offline   Reply With Quote
Old 30 Nov 2002, 09:19 AM   #3
Old member
 
Join Date: Feb 2002
Posts: 5,417
Default

Use the Avisynth "Decomb" plug-in. It has given great results for me.
Enchanter is offline   Reply With Quote
Old 1 Dec 2002, 04:50 AM   #4
Member
Member
 
Join Date: Aug 2002
Posts: 58
Default

Hey Thanks for the replys guys, i'm glad that forced film gives better quality, because its also alot faster than IVTC.

Hey Enchanter how and when do i use the avisynth decomb plugin with gordian knot.

Thanks, Robert
De Joker is offline   Reply With Quote
Old 1 Dec 2002, 09:51 AM   #5
Old member
 
Join Date: Feb 2002
Posts: 5,417
Default

Quote:
how and when do i use the avisynth decomb plugin with gordian knot
Just enable Inverse Telecine from within GK. The AVS script created will make use of the command:

LoadPlugin("decomb.dll")
Telecide()
Decimate(cycle=5)

, which works perfectly well for me (TMPGEnc's IVTC is inferior to this).
Enchanter is offline   Reply With Quote
Old 3 Dec 2002, 02:53 AM   #6
Member
Member
 
Join Date: Aug 2002
Posts: 58
Default

Then i guess i have been using avisynth, because some dvd's could not be forced filmed and had to be IVTCed.

The reason i would prefer using forced film is speed, but if IVTC would give better quality i would use that.

Thanks
De Joker is offline   Reply With Quote
Old 3 Dec 2002, 05:57 AM   #7
khp
The Other
 
khp's Avatar
 
Join Date: Nov 2001
Location: Online
Posts: 2,161
Default

Quote:
Originally posted by De Joker

The reason i would prefer using forced film is speed, but if IVTC would give better quality i would use that.
I'am pretty sure that is impossible to get better quality with IVTC instead of force film, for a film encoded DVD.

With force film you read the source frames directly from the mpeg stream at the 23.9x fps that was used to encode the film.

With IVTC you let the Mpeg-2 decoder convert the 23.9x stream to 29.9x fps (using Telecine) and then try to inverse that by matching the fields that look like they belong together.
khp is offline   Reply With Quote
Old 10 May 2003, 04:01 PM   #8
Junior Member
Junior Member
 
neuron2's Avatar
 
Join Date: May 2003
Posts: 23
Post

There are at least 2 situations where not doing Force Film is better. 1) When the 3:2 telecining is done "hard". i.e., the source into the MPEG encoder is already pulled down and it is encoded as all interlaced. This is not as uncommon as you might suppose. 2) When there is hybrid material, i.e., a mixture of film and video. For hybrid material, you retain the option to leave the frame rate at 30fps, keeping the video scenes smooth.

There are other situations as well, but those suffice to prove the point.

Last edited by neuron2; 10 May 2003 at 10:50 PM
neuron2 is offline   Reply With Quote
Reply

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are Off




All times are GMT +10. The time now is 02:39 PM.

Kirsch designed by Andrew & Austin


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright © 1999 - 2018 Digital Digest

Visit DivXLand   Visit dvdloc8.com