GKnot Question

[deKerf]

I am trying to encode an anime (SF Alpha) I think this applys to most anime's. In DVD2AVI it reports 29.970 fps interlaced 4:3 when I preview. My question is when I load the DVD2AVI project file into GKnot should I change the number of frames to 23.976 or leave it at 29.970?

Thanks

[jggimi]

Well, deKerf, first:9) Use a title that describes the content of your post. .... Many who might be able to answer your question, or provide more insight, won't even read it due to its title.

Now, about your actual question -- which is related to content and framerate -- I can help a little bit.

23.976 fps is used only for content that you wish to Inverse Telecine, known as IVTC. IVTC is used only for film content that has been Telecined.

Content that has been Telecined has been converted from 24fps to 29.97fps for display or broadcast on NTSC television. 6 frames are added each second, by blending fields together from adjacent frames. Please click on www.doom9.org/synch.htm and read the section labelled 35mm Film to NTSC Video Conversion.

Content shot by NTSC video cameras (used in the US, Canada, and Japan) has a framerate of 29.97, and will not have been Telecined.

With some content -- animated, especially -- it's sometimes not easy to tell if it was a direct-to-video transfer, or if it was shot on film. The easiest way is to examine a scene with motion frame-by-frame in Gknot or in Vdub to see if it is Telecined or not.

For true video content, you only need to deinterlace. Using GKnot 0.26.1, choose either Field or Fast Deinterlace, whichever looks best to you -- use the Preview function.

For Telecined content, there are choices. The best choice, when usable, is Force FILM. It will eliminate the "extra" frames. However, the mpeg2 metadata must allow it. Doom9 recommends "FILM 95%" or above, I'm a little more stringent than that.

Other choices require analysis and removal of individual frames, and field-deinterlacing. The "IVTC" option in Gknot will use the DeComb filters Telecide and Decimate. You can also edit the .avs file and change DeComb options, enable GreedyHMA, or you may install and use other IVTC filters available for AviSynth.