IVTC problem

[Wolferous]

http://wolferous.com/GOOD_SAMPLE.avi
http://wolferous.com/BAD_SAMPLE.avi

In the "good" sample, I used Forced Film in DGIndex (formerly known as DVD2AVI)

in the bad sample, I used IVTC instead of forced film...
in my avisynth file, I have as follows for IVTC:
Telecide(order=1,guide=1)
Decimate()

The movie looks great with both settings!.... EXCEPT this one scene that I noticed, and that is the scene that I used in the samples..

Sure, I could just force film everything I rip, but I am afraid to do that, because forced film is not a guaranteed way to do things, sometimes it leaves stuff out, such if the source isn't close to 100% FILM etc.. I've seen problems using forced film before, and I really would prefer not using it.

Why would I have this problem with IVTC??? Perhaps I need to add some parameters in the avisynth script to correct the problem that is occurring here? I noticed if I take out Decimate(), that doesn't do anything but takeout/leavein the dupelicate frames. So therefore it is likely a problem with Telecide? Or should I use some deinterlacer, or what? I know that all the parameters I could use for Telecide (without really knowing exactly what each one does) are: order, guide, gthresh, post, vthresh, dthresh, blend, show.

Please help me fix this, I don't want to resort to using forced film, I shouldn't have to!

[manono]

Hi-

It looks to me that in the bad sample good frames are being deinterlaced when they shouldn't be. You may have to raise the VThresh.

However, we can't really tell much without an unprocessed vob sample of the same scene. The already encoded AVI doesn't do us much good.

[niamh]

There isn't great motion to make sure, but at first glance it just looks like the field order is wrong. You set tff, it's probably bff
try
Telecide(order=0,guide=1)

[Wolferous]

I tried using Telecide(order=0,guide=1)
it didn't help at all whatsoever, I tried tweaking lots of other parameters as well, nothing seems to work, except forced film

[niamh]

if manono has the right of it, use post=0 to turn off post processing,so no frame will be de-interlaced at all.
it IS hard to say without a vob sample

[CWR03]

I can say to start with that I'm not particularly impressed with the good sample. Some of the problem may be the resizing; I've found the best results occur if you don't change either the height or the width of the cropped source. Forced Film always works perfectly for me with movies -- the only time I've even needed to use IVTC was with certain TV shows.

[Wolferous]

Originally posted by niamh
if manono has the right of it, use post=0 to turn off post processing,so no frame will be de-interlaced at all.
it IS hard to say without a vob sample

I tried using that with post=0 too, I looked all throughout the parameters I can use for IVTC and messed around a bit with all of them trying different stuff, nothing fixed my problem.

I would make a vob sample using Chopper XP, but the program crashes a lot, so that is no good, is there anything else I could use to make a vob sample? The reason it crashes is probably due to the fact that when I ripped the movie using DVD Decrypter, I chose for it to not split up files at all, but rather to make one big .vob stream that includes all the vobs(the ones that I need) that were on the dvd

[manono]

You can try MPEG2Cut or VobSplit.

[Wolferous]

I tried using that with post=0 too, I looked all throughout the parameters I can use for IVTC and messed around a bit with all of them trying different stuff, nothing fixed my problem.


http://wolferous.com/Sample.vob

There is a vob sample, the last frame might be corrupt for some reason, because of the way MPEG2Cut works.

[Guest]

That scene is very hard to field match due to the high-intensity vertical detail that mimics combing.

You can get results the same as using FF for that scene by using an override file (note that I use order=0 because your cut has changed the order; be sure to get it right when you process the full movie):

mpeg2source("sample.d2v")
telecide(order=0,guide=1,post=2,ovr="sample.tel")

...where the file sample.tel contains these lines:

45,162 ccnnc
45,162 -

The override capability was designed just for such situations.

But you should always prefer FF where possible.