applying filters on interlaced/telecined sources

[jul059]

Hello

I would have a small question to ask you guys about how and what filters to apply on interlaced/telecined materials. It came to me that those 2 are very different from progressive sources. So considering the fact that every frame really is seperated in two, I was wondering if we need to deinterlace the source before applying filters (ie: fft3d, undot, convolution 3D) or functions directly in AVISynth (color space conversion, deblock, etc...). Or will every filter "know" how to behave depending on the source?

Thank you.

[stickboy]

Most filters don't know anything about interlaced sources.

If your source is telecined, then you usually should do IVTC first to recover the progressive frames before applying denoising filters. (There are some exceptions, notably some of Lindsey Dubb's filters, but those filters are rather specialized and are not common.)

For interlaced material, it depends. If you want progressive output, you generally should deinterlace early on (otherwise denoisers can end up blurring the fields and can hinder the deinterlacer).

If you want your output to remain interlaced, then you can use my JDL_UnfoldFieldsVertical/JDL_FoldFieldsVertical functions (http://forum.doom9.org/showthread.php?s=&threadid=59029) to bookend the denoising filters. Another approach that scharfis_brain likes is to use a bob filter to upscale the video, apply denoisers, and then reinterlace (throwing half of the scanlines away).

[jul059]

actually, my source is a DVD I am trying to compress in DVDRebuilder. So I guess that would be telecined most of the time, right?

and thanks for the method.

[foxyshadis]

Could be anything. Here's how to find out:
http://forum.doom9.org/showthread.php?p=804197#post804197