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Rendering to Big Screens with unusual Aspect Ratio

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Sebastian Rivera
Rendering to Big Screens with unusual Aspect Ratio
on Mar 22, 2013 at 8:50:09 pm

HI, Everyone. I think this is my first post in CreativeCow, but have been a big fan since forever.


My question is as follows- I have an L.E.D Screen 20mm dot pitch - that is 4 wide by 60 feet height.
I want to render my footage from AE and Premiere and make it fit perfectly like a glove.

How do I convert the 4 x 60 aspect ratio to something I can Put in after effects or premiere?

Also
I am wondering if this is the right workflow?

I render out 1080 width and 1920 height then re import it to a composition that is the aspect ratio conversion of 4 x 60 and scale the imported footage to fit the new comp

what do you thinK?

is there a way to specify the dot pitch amount so that AE and Premiere knows?

I'll appreciate your help greatly!


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Dave LaRonde
Re: Rendering to Big Screens with unusual Aspect Ratio
on Mar 22, 2013 at 9:14:48 pm

I think you should contact Walter Soyka, the indidvidual on the COW who apparently has the most experience with multi-screen displays.


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Darby Edelen
Re: Rendering to Big Screens with unusual Aspect Ratio
on Mar 22, 2013 at 9:58:37 pm

You should never need to know dot pitch when working in AE or Premiere. The only things that matter when creating content with AE for a specific display is that display's pixel resolution and pixel aspect ratio.

You can simply match your composition settings to these values and you should be good to go.

Darby Edelen


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Sebastian Rivera
Re: Rendering to Big Screens with unusual Aspect Ratio
on Mar 22, 2013 at 10:17:03 pm

Thank you Dave and Darby.

Darby

is there a math formula to get the aspect ratio based on the screen dimensions and maybe the dot pitch?
or do you get the aspect ratio based on the resolution?

I can ask the screen manufacturers about the resolution but I am not sure they will give me the aspect ratio.

Dave

I will try to contact Walter Soyka if by the end of the day I am still a bit confused.
thanks for the tip.


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Darby Edelen
Re: Rendering to Big Screens with unusual Aspect Ratio
on Mar 22, 2013 at 10:35:23 pm

If you have the pixel resolution of the display and the physical aspect ratio you can determine the pixel aspect ratio with some simple arithmetic.

Pixel Aspect Ratio = (Physical Width / Physical Height) / (Pixel Width / Pixel Height)

In all likelihood (and in my experience) an LED array will use a square pixel aspect ratio.

Darby Edelen


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Walter Soyka
Re: Rendering to Big Screens with unusual Aspect Ratio
on Mar 25, 2013 at 7:13:20 pm

[Sebastian Rivera] "My question is as follows- I have an L.E.D Screen 20mm dot pitch - that is 4 wide by 60 feet height. I want to render my footage from AE and Premiere and make it fit perfectly like a glove."

You should ask for more information on the playback system and pixel mapping for this LED display.

My back-of-the-napkin calculations suggest that the native resolution of this display is somewhere in the neighborhood of 61 x 915 pixels. However, depending on the video processing necessary to feed that LED system, that may be immaterial.

You need to get a delivery spec that you can work with, so you can be confident your content will play as intended.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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