Ivtc? Wtf?

[bwoodley]

I'm encoding Metropolis... Anime

DVD2AVI says its NTSC and Interlaced the whole time, the guides say that I need to perform IVTC? where is this? what is this? sorry im dumb ;)!!!

Thanks

[manono]

Hi-

For Metropolis and most anime in general, Force Film isn't good enough. Too many interlaced frames will get through. So, you'll have to perform IVTC (Inverse Telecine). Make your .d2v in DVD2AVI with no Field Operation (30fps), and when creating your .avs in GKnot, over on the left side, under Field Operation, you'll see IVTC. So, just tick that and you'll be on your way. Reading hakko504's Sticky (http://forum.doom9.org/showthread.php?s=&threadid=23776) on the subject might help explain it more.

[jggimi]

IVTC stands for Inverse Telecine.

There's a great description of the Telecine process in this link: www.doom9.org/synch.htm. Read the section labelled 35mm Film to NTSC Video Conversion. It may help.

[danjx]

I also am incoding an anime movie. It is NTSC Interlaced at 4:3. If I select IVTC after clicking "Save and Encode", my project will crash in a matter of seconds on the first pass. I can use the Smart Deinterlace option OK.

The file: C:\Program Files\GordianKnot\Docs\GordianKnot_HowTo.txt states that IVTC will not work. The Doom9 guide says I can use IVTC. I think I have used it OK in the past, but never got the compression test to work with it turned on.

I have reinstalled GK 2.1 and 2.6 and DivX5.02

Can anyone suggest what is going on and how I should proceed?

-Dan

[theReal]

check the avs file that Gordianknot creates.

Instead of the ivtc that Gknot 2.6 uses, the two lines "telecide()" and "decimate(cycle=5)", you can also try other ivtc plugins for avisynth like inversetelecine and ivtc (which is the same filter or not? I'm not sure...).

My experience with ivtc is anyways that for every movie you need another filter and other settings for it to work perfectly. The Gknot ivtc (decomb.dll) has worked perfectly for one out of four movies, for the other three I needed inversetelecine.dll, with different settings for each movie...

[manono]

Hi-

As theReal says, it's almost certainly the .avs (perhaps the cropping). Perhaps you could post it here and we could have a look (leave off the lines beginning with "#").

Also, before encoding, it's a good idea to open the .avs in the Preview, or enter it into VDub-Nandub and scroll around. The idea is to make sure it looks OK and doesn't crash, so the actual encoding will go smoothly.

[danjx]

Thanks to theReal and manono for their responses. Here is the AVS file:

LoadPlugin("C:\PROGRA~1\GORDIA~1\mpeg2dec.dll")
LoadPlugin("C:\PROGRA~1\GORDIA~1\decomb.dll")
LoadPlugin("C:\WINDOWS\SYSTEM\vobsub.dll")
mpeg2source("D:\VIDEO_TS\Anime\Proj.d2v")
FieldDeinterlace()
crop(4,1,712,475)
VobSub("D:\VIDEO_TS\Anime\VTS_01_0")
BicubicResize(512,384,0,0.5)

I'm just deinterlacing right now, until I find out why it crashes with Gordian Knot's IVTC setting.

[manono]

Hi-

You're welcome, but it's easier to tell you to give us more information, than to actually fix it, and I don't see anything that jumps out at me as being obviously wrong.

Did you take the Real's and my suggestion to open the .avs in VDub and check it out? If it doesn't crash, then there's something else wrong.

If it does crash when scrolling around, I would try even numbers for my top-bottom crops:

crop(4,2,712,474) or something like that. Then try and open it again and scroll around in VDub. If that doesn't work, then I would try and put VobSub after resize, like so:

BicubicResize(512,384,0,0.5)
VobSub("D:\VIDEO_TS\Anime\VTS_01_0")

[theReal]

I never use the VobSub plugin for avisynth, but I heard there might be problems with it (and like manono said, sometimes you can solve them by changing the order of the filters).