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green screen dv pal and pro res

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tas underwood
green screen dv pal and pro res
on Jun 15, 2011 at 4:33:12 pm

Hi there,

I have some footage that I have captured on a Z7 (M2T files). I have then encoded them to apple pro res using Mpeg Streamclip and then keying it in final cut. This seems to be a slow process and was wondering what the best process is. Can i put the prores files into After Effects and export. The final file format doesnt have to be HD.
Anyones help on this would be massively appreciated!!!
Thanks


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Dave LaRonde
Re: green screen dv pal and pro res
on Jun 15, 2011 at 6:56:21 pm

You're not entirely clear on what's slowing you down. Can you specify?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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tas underwood
Re: green screen dv pal and pro res
on Jun 15, 2011 at 7:01:25 pm

The rendering in final cut is slow and converting to pro res from mpeg streamclip. Is this the right process to follow?


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Dave LaRonde
Re: green screen dv pal and pro res
on Jun 15, 2011 at 7:43:27 pm

Yes, that's the way to do it. It takes a certain amount of time to convert those mts files. Since FCP can't chroma key in real time, it has to render.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Brendan Maghran
Re: green screen dv pal and pro res
on Jun 15, 2011 at 7:44:14 pm

Sounds like you're doing fine, compositing isn't exactly the fastest of all processes. Are you asking about keying in AE?


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tas underwood
Re: green screen dv pal and pro res
on Jun 15, 2011 at 7:51:27 pm

Yeah was wondering whether it was better to import pro res files into ae then use keylight and export. But is animation codec only one that will work with transparency?


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Dave LaRonde
Re: green screen dv pal and pro res
on Jun 15, 2011 at 8:27:03 pm

Quicktime's PNG codec will also support alpha channels.
If you run AE on the same machine as FCP (ver. 7 only), you can also use ProRes 4444, which may even play in real time.

But if you're going to go to all that trouble, why not just do the entire shot -- foreground AND background -- in AE? Sure, you have to pick the background beforehand, but that's not tough.
There are two bonuses to doing this:
  • You see the keyed subject over the background, so you KNOW the key is right, and you can color correct so the subject looks like it belongs with the background.
  • You can render out the entire shot in ProRes 422, no alpha channel necessary.


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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