Reducing the ghost-effect

ookzDVD · 18th April 2002, 06:00

Dear forum,

Since all my material is in NTSC-interlaced format,
so I have to perform de-interlace and I could encode them in
progressive mode.

So far I use SmartDeinterlace with default setting which
GordionKnot generate the script for me.

As the result is I always got the ghost-effect,
so the question is what is the best way (filter) to reduce
the ghost-effect since to remove it is "impossible".

Thank you.

DJ Bobo · 18th April 2002, 12:21

You're using the wrong filter.

You should use Inverse Telecine to get progressive, smooth and ghost free 24fps output:
1) Use IVTC2.2 with the following setting:
ivtc(32,11,120)
2) Or use Decomb with the following setting:
Telecide()
Decimate(cycle=5)

Pko · 18th April 2002, 13:18

I think that bobotns' solution will work very well but ONLY if your material is FILM (that is, 24fps, for example from movies, converted to NTSC by telecining)

If it is not so, I think the better solution is using decomb with simply FieldDeinterlace(). It works very well for me with default settings, but there are some parameters to change is you wish to do some experimentation; read the docs in that case.

Usually, a little ghosting will remain but usually is very bearable.

Mentar · 18th April 2002, 15:55

If you really really don't want any ghosts, you should run decomb with the blend=false setting in the Telecide call. Because sometimes the "ghosts" are in fact blended frames to enable a kind of half-motion.

Typical anime setting would be this:

Telecide(blend=false,guide=1,gthresh=50,threshold=30)
Decimate(cycle=5)

ookzDVD · 19th April 2002, 03:14

@ bobotns,

Thank you,
I think my source is not from FILM, it's purely interlaced,
'cause when I look at from VDub, frame by frame, all are interlaced.

@ Pko,

Yes, I've tried use decomb, but I found the quality is a little bit
blurry than use SmartDeinterlace, but I'll learn more.

@ Mentar,

Thank you, but it will be dropped to @25 isn't it ?
And it's not anime. But thank you again.

hakko504 · 19th April 2002, 08:24

Greedy also seems to produce ghost-free de-interlacing with

Code:

GreedyHMA(1,0,0,0,0,0,0,0)

It is not distinctly better than smartdeinterlace (or Decomb) in interpolation mode but is absolutely worth a try for most sources.

ookzDVD · 19th April 2002, 08:35

hi Hakko,

Thank you again, I still remember your tips for SmartDeinterlace,
it seems useful for me. Thank you again.

18th April 2002, 06:00	#1 \| Link
ookzDVD DVD Rebuilder! Join Date: Oct 2001 Posts: 1,147	Reducing the ghost-effect Dear forum, Since all my material is in NTSC-interlaced format, so I have to perform de-interlace and I could encode them in progressive mode. So far I use SmartDeinterlace with default setting which GordionKnot generate the script for me. As the result is I always got the ghost-effect, so the question is what is the best way (filter) to reduce the ghost-effect since to remove it is "impossible". Thank you.

19th April 2002, 03:14	#5 \| Link
ookzDVD DVD Rebuilder! Join Date: Oct 2001 Posts: 1,147	@ bobotns, Thank you, I think my source is not from FILM, it's purely interlaced, 'cause when I look at from VDub, frame by frame, all are interlaced. @ Pko, Yes, I've tried use decomb, but I found the quality is a little bit blurry than use SmartDeinterlace, but I'll learn more. @ Mentar, Thank you, but it will be dropped to @25 isn't it ? And it's not anime. But thank you again. Last edited by ookzDVD; 19th April 2002 at 03:17.

19th April 2002, 08:24	#6 \| Link
hakko504 Remember Rule One Join Date: Oct 2001 Location: SWEDEN Posts: 1,611	Greedy also seems to produce ghost-free de-interlacing with Code: GreedyHMA(1,0,0,0,0,0,0,0) It is not distinctly better than smartdeinterlace (or Decomb) in interpolation mode but is absolutely worth a try for most sources. __________________ /hakko http://www.boardgamegeek.com

19th April 2002, 08:35	#7 \| Link
ookzDVD DVD Rebuilder! Join Date: Oct 2001 Posts: 1,147	hi Hakko, Thank you again, I still remember your tips for SmartDeinterlace, it seems useful for me. Thank you again. Last edited by ookzDVD; 19th April 2002 at 08:39.

18th April 2002, 12:21	#2 \| Link
DJ Bobo Encoding Dinosaur! Join Date: Oct 2001 Location: Europe Posts: 1,668	You're using the wrong filter. You should use Inverse Telecine to get progressive, smooth and ghost free 24fps output: 1) Use IVTC2.2 with the following setting: ivtc(32,11,120) 2) Or use Decomb with the following setting: Telecide() Decimate(cycle=5)

18th April 2002, 13:18	#3 \| Link
Pko Registered User Join Date: Feb 2002 Posts: 140	I think that bobotns' solution will work very well but ONLY if your material is FILM (that is, 24fps, for example from movies, converted to NTSC by telecining) If it is not so, I think the better solution is using decomb with simply FieldDeinterlace(). It works very well for me with default settings, but there are some parameters to change is you wish to do some experimentation; read the docs in that case. Usually, a little ghosting will remain but usually is very bearable.

18th April 2002, 15:55	#4 \| Link
Mentar Registered User Join Date: Nov 2001 Location: Hamburg Posts: 94	If you really really don't want any ghosts, you should run decomb with the blend=false setting in the Telecide call. Because sometimes the "ghosts" are in fact blended frames to enable a kind of half-motion. Typical anime setting would be this: Telecide(blend=false,guide=1,gthresh=50,threshold=30) Decimate(cycle=5)