De-Interlace to help keying

[Chris Wright]

I have tested every deinterlacing plugin, even the amazing algolith, and they all hinder keying, that’s what happens when you interpolate.
So key first, then deinterlace if needed!

[Dino Muhic]

Hi guys

I’m happy to find this thread right before I wanted to create my own one about quite the same problem.

This is my task:
I have greenscreen footage in 1440*1080 (50i PAL) with a still camera and one actor making small but fast movements. It’s shot with 1/250 shutter speed and I’m asking myself now if I should deinterlace it before keying?

I exported the clip as a Quicktime including PNGs with 1920*1080 Pixels and upper field first and imported it into AE.

I could use Revision FieldsKit aswell as Twixtor but I’m not that familiar with these plugins as I should be.

I used the technique described in this Creative Cow Article https://library.creativecow.net/articles/solorio_marco/twixtor_review.php

But my problem is already in the Fieldskit Deinterlacing part:
I’ve done everything like in the article (including interpret the footage as interlace: off) but the pixels which are NOT included in the motion mask have really subtle and thin scanlines which only go away when I disable the motion mask.

So what’s your opinion about it?
As chris said I’ll try to key it first and then deinterlace but still I would like to know what I’m doing wrong or just how to deinterlace the stuff in the best possible way with these plugins?

Thanks alot guys

Dino Muhic – Media Producer
VFX – Motion Graphics – Web-Design – Or just ART
http://www.dinomuhic.com

[Dino Muhic]

Well Chris, thanks a lot. Like I said it’s just my task to do so 🙂

I used Fieldskit but like I said I got this weird scanlines in the non-motion mask parts.

In terms of keying here in the company I use Keylight together with Red Giant Composite Wizard’s Deartifacter. I think it does the same thing as primatte in terms of deartifacting and I’m going pretty well with this combination. Or is the primatte deartifacter really better?

Dino Muhic – Media Producer
VFX – Motion Graphics – Web-Design – Or just ART
http://www.dinomuhic.com

[Chris Wright]

Twixtor’s built in deinterlacer is no better than AE’s. Revision says so. They recommend fieldskit for deinterlacing.

I believe the keyers can work with separated fields because that is how they are programmed. If you try to key individual fields, the keys don’t seem to work as well. The same with deinterlacing plugins. Don’t ask me, ask the programmers.

The thing you should focus on is de-artifacting, the compression of dv color loss that gets reconstructed. It’s built into Primatte and Magic Bullet. It helps key 10x better. Not to mention not using dv cameras in the first place, lol.

[Dino Muhic]

Thanks Dave.

Well in keying HDV I became quite good during my years in study where we just had poor HDV/DV cams. 🙂
The keying itself is not the problem.
I’m asking for deinterlacing because I know that the footage will be composited and retouched massively in AE after it and I wondered if I should deinterlace it with a better plugin like FieldsKit/Twixtor instead of the AE deinterlace to have the best 25p as possible, because that’s what I need to render out (25p).

But like I said, the Fieldkit Workflow somehow is not working for me, sadly….

Dino Muhic – Media Producer
VFX – Motion Graphics – Web-Design – Or just ART
http://www.dinomuhic.com

[Chris Wright]

Now don’t be tempted to download the Primatte demo.
CLICK HERE
https://www.redgiantsoftware.com/downloads/trial-versions/
CLICK HERE

btw Algolith deinterlacer is 99.9% quality for deinterlacing.
Magic Bullet’s isn’t bad either.

[Trevor Osborn]

I’ve been having similar problems with footage I filmed recently. I have been trying to de interlace it but it does not seem to make much difference…

I shot stuff with a sony Z1 the other day thinking it was on HDV, but it was on auto and shot in what i think is DV but it wont show up in a normal DVcan thus making me think it was HDV still… I opened a 1080p 50i project in Permiere CS3 and the only way I could capture was in DV.

Here is what the properties say about the file:

Type: AVI Movie
Image Size: 720 x 576
Pixel Depth: 720
Frame Rate: 25.00
Average Data Rate: 3.6 MB / second
Pixel Aspect Ratio: 1.422

Interleave: 1 : 24.26

Video track 1:
Size is 126.61M bytes (average frame = 148.12K bytes)
There are 922 keyframes.
Frame rate is 25.00 fps
Frame size is 720 x 576
Depth is 24 bits.

My question now is how can I make this look good quality for DVD? I opened a 1024 x 576 project but exporting frames of this still leaves it looking 4×3.

Any tips would be great!

Trev not so smart 🙁