Ivct

[alku83]

I realise this has been covered many times before, and I've tried my hardest to understand it all by reading all the search results, but I'm still a little lost. So please be patient with me, I have tried.

My film source is straight NTSC, and in Doom9s guide, it just says use IVCT, but does not elaborate any further. Does this just mean (in GKnot 0.26) that I need to check the IVCT in avs -> correct frame count box?

I've included my log in case it's any help.

10:38:18 AM: IVTC: Re-Calculating Frame Count.
10:38:18 AM: IVTC: FrameRate was 29.970 fps
10:38:18 AM: IVTC: FrameRate now is 23.976 fps
10:38:18 AM: IVTC: 189914 Frames.
10:38:18 AM: Audio 1, determined: 186646 kb
10:38:18 AM: Audio 1, calc: 185648 kb
10:38:18 AM: New Bitrate for Movie = 1701 k(=1000)Bits/s
10:38:18 AM: Trying to open Log-file.
10:38:33 AM: Success: Log-file open.
10:38:33 AM: Encoded: 224624 Frames.
10:38:33 AM: WARNING: Number of counted frames differs from settings!
10:38:33 AM: WARNING: Settings: 189914
10:38:33 AM: WARNING: Counted: 224624
10:38:33 AM: WARNING: Difference: 34710
10:38:33 AM: Correcting Bitrate...
10:38:33 AM: Original Bitrate = 1701 k(=1000)Bits/s
10:38:33 AM: Now encoding at 1436 k(=1000)Bits/s

[manono]

Hi-

You also have to actually set up the IVTC when creating the .avs. Then when done, open it up and make sure that you have the Telecide-Decimate lines in there. If I'm reading the log correctly, you've created a 29.97fps movie (without IVTC).

However, there's a good chance that you have a pure interlace source. To be sure, open your 29.97fps .d2v in Gknot, and advance the frames one-by-one. If every frame is interlaced, you can only deinterlace (and leave it at 29.97fps). If only 2 of 5 frames are interlaced, then go ahead and perform IVTC.

[alku83]

Thanks for the help, but I'm still confused - I'm just moving over from Fairuse, so I'm pretty new to all this frameserving and avs file stuff - Fairuse had it's own IVTC algorithms built in, which worked great, so I've never really had to worry about it before.

When you say, you have to set up the IVTC when creating the .avs, do you mean similarly to the guide here?
http://www.doom9.org/gknot-decomb.htm

I had the lines every 2/5 frames - so I will ahead and perform IVTC, as in the previous guide?

Cheers.

[manono]

Hi-

Yep-Fair Use's IVTC is damn good.

Yes, you can set it up yourself as described in the link, but it's easier to let GKnot do it for you. You set up your .avs in File-Save And Encode and tick the IVTC button (it shows up only if you opened a 30fps.d2v). Then this warning message pops up which you ignore because you are NTSC and not PAL, and when you later open up the .avs, you'll see it without the #s in front. However, if this an anime, you might have to add some extra settings manually as described elsewhere in that link to which you pointed me. And if it's just a regular movie, and you are sure there are no interlaced frames that sneak through having to be deinterlaced, then you might try:

Telecide(Post=False)
Decimate(Cycle=5)

That disables the FieldDeinterlace and speeds up the encoding considerably. And if it crashes VDub-Nandub, then you didn't abide by the Horizontal Crop Must Be Divisible By 4 Rule. So always preview it in GKnot's Preview or open it up in VDub-Nandub and scroll around to make sure everything looks OK and it doesn't crash.