Deinterlacing

Anything related to video and my tools that is not a support request.
Mat1926
Posts: 13
Joined: Thu Mar 15, 2018 9:16 am

Re: Deinterlacing

Post by Mat1926 » Tue May 08, 2018 3:46 pm

How can I extract a sample w/o processing that is reasonable in size for you? What method is best?

Thnx

*edit*
I also would like to PM you some screens, I prefer not to put them in public...is that okay?!

Thnx

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admin
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Joined: Thu Sep 09, 2010 3:08 pm

Re: Deinterlacing

Post by admin » Tue May 08, 2018 3:54 pm

Open the stream in DGIndexNV. Set a range around the desired sample area with the [ and ] buttons. Go into Demux and enable video demuxing. Save project. You will get an M2V file (assuming your source is still VOB).

A possible host is tinyupload.com (50MB max).

Yes, go ahead and PM me the screens.

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admin
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Re: Deinterlacing

Post by admin » Tue May 08, 2018 5:55 pm

Next time please give a much larger sample, 25-50 MB.

You have two problems. First your cropping is invoking the Chroma Upsampling Error (CUE). You have to crop in multiples of 4. So do this:

Crop (8, 8, -24, -4)

You can use the DGIndexNV cropping filter if you like, instead of the Avisynth internal Crop(). It will enforce multiples.

Second, you have noisy fields, which can look like interlacing. Suppose the pattern is:

a a a b b c c c d d ...

The three a fields should be identical (after vertical alignment), but when stepping through by fields you can see that they differ by noise and other distortions. If the residual combing caused by this bothers you (to me it looks too small to be visible when viewed at normal size and speed) then you can tweak the postprocessing.

I will tell you again that this 3:2 telecined stream is not suitable for QTGMC and won't comment any further on that. Also, it won't return your frame rate to 23.976.

Mat1926
Posts: 13
Joined: Thu Mar 15, 2018 9:16 am

Re: Deinterlacing

Post by Mat1926 » Wed May 09, 2018 12:08 am

admin wrote:
Tue May 08, 2018 5:55 pm
You have to crop in multiples of 4. So do this:
Always multiple of 4, or for some special cases? I always used multiple of 2...

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admin
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Re: Deinterlacing

Post by admin » Wed May 09, 2018 10:02 am


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