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Rendering Long Compositions

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Evan RobinsonRendering Long Compositions
by on May 22, 2014 at 12:07:30 pm

Hi all,

I am editing a seminar around an hour and twenty minutes long. The pastor was shot in front of a green screen. I did not like any of the keying solutions in premiere, so I used after effects key light. The problem is that it takes around 30 hours to render, since it's so long. I am also rendering it to an external drive, so it does not slow down my main hard drive. Premiere (at least the edition I own) does not have key light, and after effects takes so long to render. What can I do about this?


Thanks

E. Robinson


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Dave LaRondeRe: Rendering Long Compositions
by on May 22, 2014 at 2:15:34 pm

Not much. You're stuck rendering. At least you have a long weekend to do it.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Evan RobinsonRe: Rendering Long Compositions
by on May 22, 2014 at 2:34:52 pm

Thanks,

E. Robinson


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Dave LaRondeRe: Rendering Long Compositions
by on May 22, 2014 at 2:46:04 pm

Before you begin the long render, do yourself a favor: do a test render of a short section. To select that short section, look for potential trouble shots: the camera exposure changes or the camera moves would be two good things to watch out for.

You'll only need a minute of each. See how they turn out. Look for noise in the keyed subject. You don't want to do a Homer Simpson "DOH!" after 30 hours of rendering, y'know?

And if the camera exposure DOES change, and you happened to be shooting with the Auto Iris on, you could be in for a very long process of correcting things -- i.e. animating Keylight settings to accommodate the iris change -- before you begin your marathon render.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Jon DoughtieRe: Rendering Long Compositions
by on May 22, 2014 at 2:46:44 pm
Last Edited By Jon Doughtie on May 22, 2014 at 2:47:40 pm

I do not know what version of AE you are using, and it may be too late to mess around with. But with fewer pixels to process, you might get better render times using the trick in this Creating Super Tight Junk Mattes tutorial:

http://library.creativecow.net/articles/rabinowitz_aharon/junk_mattes.php

I use this routinely for chromakey work in AE now. Something to tuck away for the future.


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Daniel WaldronRe: Rendering Long Compositions
by on May 22, 2014 at 4:55:43 pm

That's a fantastic technique. Thanks for posting it.

I'd imagine that doing the auto trace for a hour and twenty minute clip would still take a significant amount of time to process. So while the final render time should theoretically decrease, I wonder how much actual post time would be saved?


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Dave LaRondeRe: Rendering Long Compositions
by on May 22, 2014 at 5:24:57 pm

It doesn't save time on rendering. It DOES make it easier to make better edges between the subject and the background. This is particularly good if you find yourself in need of creating a core/edge matte combo to pull a key.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Walter SoykaRe: Rendering Long Compositions
by on May 22, 2014 at 4:01:56 pm

Premiere has shipped with Ultra Key since CS5. Have you tried it?

Ultra Key is reasonably tweakable, pretty good, and GPU-accelerated (read: super-fast).

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter] | RenderBreak [blog] | Profile [LinkedIn]


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Evan RobinsonRe: Rendering Long Compositions
by on May 22, 2014 at 6:37:17 pm

I have cs4, but thanks

E. Robinson


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Walter SoykaRe: Rendering Long Compositions
by on May 22, 2014 at 8:48:37 pm

[Evan Robinson] "I have cs4, but thanks"

If your computer meets the system requirements [link], you could use the Premiere Pro CC trial [link]. There's been a lot of improvements in Premiere since CS4.

Even if you ultimately decide you don't like it or don't want to go on subscription, you could use it just to pull and render the key.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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