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Rendering in AE - What causes this?

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john coleyshawRendering in AE - What causes this?
by on Nov 12, 2013 at 2:11:48 pm

What causes my ramped background to render out like this?

This is how it should look


...and this is what is happening.

Previous renders have been fine - I don't know what exactly I did to make it start behaving like this. Am using Media Encoder with a Vimeo preset.

Any help appreciated.


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Erik WaluskaRe: Rendering in AE - What causes this?
by on Nov 13, 2013 at 5:22:13 pm

Impossible to say without more info about your project and render settings.

Erik Waluska
EAWmedia


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john coleyshawRe: Rendering in AE - What causes this?
by on Nov 14, 2013 at 2:02:14 pm

Thanks for your responses - here's my System Info:

Intel Core 2 Quad CPU 2.33GHz
8GB RAM
64 bit Windows 7
ATI Radeon HD3800 Series

After Effects CS6 - Version 11.0.3.6 - all up to date

Rendering as an MP4 using Media Encoder on these settings:

Preset - Vimeo HD 720p 29.97fps
Field Order - progressive
Profile - High
Level 3.1
VBR 2 Pass
Target bitrate AND Max bitrate both set to 5

This issue appears to be affecting just the background layer which is a solid with a ramped gradient. I've tried redering it seperately as an MP4 and using that in the main comp instead and still get the same effect above.

The comp renders out mostly OK, but in the middle of the comp the background flickers to black and back again. I've rendered it out a few times previously with no problemms but this problem started appearing after I started moving the comp's camera. (this is standard 3d btw, not ray traced. RAM preview is fine.

These are my memory & Multiprocessing settings:



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Erik WaluskaRe: Rendering in AE - What causes this?
by on Nov 14, 2013 at 4:12:09 pm

My first guess is that your background gradient layer is a 3D layer and is in the same Z position as another layer that's below it in the layer stack. That can cause random flickering like what you're describing. If so, just separate the layers by a couple of pixels.

Erik Waluska
EAWmedia


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john coleyshawRe: Rendering in AE - What causes this?
by on Nov 14, 2013 at 5:12:44 pm

Thanks Eric - but the background layer is 2D.

I've even tried replacing the background with a flat .png image instead of generating it in AE - and still the same.


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Erik WaluskaRe: Rendering in AE - What causes this?
by on Nov 14, 2013 at 5:48:08 pm

That's really strange for sure. I've had some weird flickering caused by cached frames before but that will usually show up in the RAM previews. It wouldn't hurt to try purging all of the memory though. Do the Edit>Purge>Image Cache Memory and also in Preferences>Media & Disk Cache hit the "Empty Disk Cache" and the "Clean Database & Cache" buttons and see if that helps.

Erik Waluska
EAWmedia


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Greg KoronowiczRe: Rendering in AE - What causes this?
by on Dec 5, 2013 at 11:28:22 pm

I finally found someone that has the same issue I do.


I get this glitch when I render out from Premiere CS6 and After Effects CS6 via Media Encoder CS6.
I use the H264 encoder and I get this glitch which is a few frames, not the whole video.
Even if I create a Master Pro Res version, which looks fine, I take that APR file into AME and I get this when I output to an mp4 file.

BUT, I play the mp4 in QT7 and no glitch is seen...only in QT10.
Also, this glitch does not occur if I use AME CS5 to create my mp4 file.
I've tried to find a solution but I haven't yet.

My colleague at work with a similar machine does not have this problem.


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