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8k 32 bit render fails, bigger GPU needed?

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Uwe Felski
8k 32 bit render fails, bigger GPU needed?
on Jan 19, 2018 at 9:11:43 am

Hi there,

I am working on a project in 8718x3840, 60fps.
I have a couple of gradients, glows, my Project, bit depth is 32 bit.
I need to render out as 4 separate, rotated 4k clips for a 4 screen wall (the extra 87 wide pixel are for compensating the bezels between the screens, so all circles are round for example, when they overlap on the screens).

- I preview quarter resolution, skip 2 frames, works fine
- rendering out the full res, crashes AE, so I render out the 4 rotated quarter splits from AE, 3840x2160, 60fps
- 32bit aborts render after a couple of seconds tried all, Media Encoder, Image Seqs... CPU only (wich I found was the most stable, so I switched Mercury Engine to CPU only)
- Render out my 32bit Project to 8bit ProRes 422 works.
- Empty Cache every 7 frames (secret settings in Prefs)

more than half of the time on this project I am working on technical issues, (some effects caused render fails, or flicker for example)

would better GPU help, like a 1080 ti with 11gb?

My setup:
OSx 10.12.3 (tried win 10 too, same issues)
64 bg Ram
intel 6700k
Gtx 970 4gb
SSDs for Project
AE cc 2017 & 2018

Any help would be so great, as time is a big factor.
Thank you so much!!

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Dave LaRonde
Re: 8k 32 bit render fails, bigger GPU needed?
on Jan 19, 2018 at 5:12:06 pm

I see that you are working in 32 bit. Have you looked at the results in 16 bit?

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

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James Paulley
Re: 8k 32 bit render fails, bigger GPU needed?
on Apr 17, 2018 at 5:13:29 pm

Hi, did you get anywhere with this?

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Uwe Felski
Re: 8k 32 bit render fails, bigger GPU needed?
on Apr 18, 2018 at 5:52:47 am

I actually solved it with a mixture of solutions

- I rendered out in 8 bit, wich was totally fine
- i rendered the individual 4x 4k , 60fps clips separately as it had to be stitched together by 4 synced players anyway.
- i upgraded my Gtx 970 4GB to a Gtx 1080 ti with 11gb wich made working much more comfortable
- in the secret Pref Settings in AE I set empty cache to every 10 frames, wich I later set higher again, but it`s a good starting point.
I still had a couple of render fails wich have been disappeared after the latest AE update.
I also found a couple of effects caused problems in 8k rendering (Glow for example) I tried to find out where in the render the fails happened and pre rendered the Comps or layers causing render fails. Took all quite a bit of troubleshooting time but worked all out in time.

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Steve Bentley
Re: 8k 32 bit render fails, bigger GPU needed?
on Apr 18, 2018 at 6:20:43 am

So to ask a dumb question - is there a reason to render out at 32bit (for your project?) Is it possible the container you rendering out to doesn't support 32bit? I know that they sometimes call quicktime with alpha "32bit" but that's total number of bits across all channels (including an alpha) not 32 bits per channel.
Do I have that right? you were trying to render TO a 32 bit file?

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