Can I check IVTC if my source is interlaced NTSC?

[compunerd632]

I'm trying to compress this movie really small, so I thought having a smaller framerate would help. It is interlaced NTSC and I was wondering if I can check the IVTC to reduce the framerate to 23.976? Since it was never film, I didn't know if this would work.

[manono]

Hi-you should always reduce the frame rate of NTSC movies to 23.976fps, either through Forced FILM in DVD2AVI, or some form of IVTC. So, the answer to your question is yes. GreedyHMA may work better than the default IVTC (but you'll have to open up your .avs file and do it manually).

[j6]

I've been curious about this also. What if you have an interlaced source that you want to de-interlace and perform IVTC? The source is not atleast 95% Film so you can't do Force Film in DVD2AVI and Gordian Knot does not allow you to select both IVTC AND de-interlace.

[Antti]

You can't perform inverse telecine if the source material isn't telecined.

Using both IVTC and de-interlace in GKnot is possible, at least by editing an avs script.

[manono]

Hi-I don't think I've ever seen a non-telecined NTSC DVD. Sure, animes sometimes have some 30fps computer generated sections, but 30fps non-telecined all the way through? Do you know of any well known examples? And GreedyHMA can reconstruct the original frames anyway, without framerate reduction if necessary, with the proper settings. And as we all know, just because it says 100% NTSC in DVD2AVI doesn't mean it's non-telecined.

For the others. You can open the GKnot generated .avs with Word Pad and edit it. For example, to add deinterlaceing, just delete the cross hatch thing at the beginning of the deinterlace line of your choice. If you want to use GreedyHMA, be sure to check out its readme included in GKnot so you'll get the proper settings. The GKnot ones included aren't necessarily the proper ones for your situation.

[Mikele]

Every NTSC DVD created from a video source is a pure interlaced stream, and of course it has not been telecined at all.