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Weird Render problem

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andrew donaldson
Weird Render problem
on May 17, 2010 at 9:36:13 pm

Hi guys (and gals),

Im experiencing some really weird blur type effect when rendering a sequence from AE. And Im really not that sure hows to describe it!
Basically, I have a template setup in AE for the endframe of the promos we make. I export the required clip (5 secs or so) from my edit in FCP7 and import it into AE to setup the graphics.

Everything in AE seems fine, the RAM preview looks good, everything is sweet, but when i export the file out i get this weird blurry effect whenever there's heaps of motion. When the shot is static, it all looks fine, but when there's alot of motion in the shot it renders all freaky.

I've been rendering Animation with an alpha channel, but have tried all sorts of codecs, and TIFF sequences, etc. all with the same problem.
The blurring happens when i playback the file in FCP, and when I play it through Finder/QT.
Ive tried exporting different codecs from FCP to AE, but with the same results.

The sequence doesn't have any 3D layers, there's no cameras, there's no movement in the layers at all, except in the shot itself.
Its definatelty not a smooth motion blur, its very ugly and strange!

I hope that's clear-ish!

Cheers,

Andrew.




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Dave LaRonde
Re: Weird Render problem
on May 17, 2010 at 9:52:44 pm

There is a set of common causes of AE Weirdness. Do any apply to you?

• Not having the free upgrade to AE 9.0.2 (if applicable).
• Trying to use multiprocessing with 6GB or less RAM: just turn it off.
• Trying to use Open GL to accelerate renders: it's typically good to turn it off.
• And the #1 cause of AE weirdness: the wrong kind of video footage! Read on:

Dave's Stock Answer #1:

If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, AVCHD, mp4, mts, m2t, H.261 or H.264 -- you need to convert it to a different codec.

These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.

In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.

I'm a Mac guy, so I like to convert to Quicktime movies in the Animation or PNG codecs; both are lossless. I'll use Apple's Compressor, Adobe Media Encoder or Quicktime Pro to do it.


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


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andrew donaldson
Re: Weird Render problem
on May 17, 2010 at 11:09:17 pm

Hi Dave,

Thanks for getting back to me.

okay, sorry should have told you specs:

Mac OSX 10.5.8
8Gb RAM
AEFX CS4 9.0.2
FCP 7

I capture the source footage from Digibeta in FCP with Blackmagic's uncompressed 8bit codec.
Then usually i choose 'export movie' so it renders in the same codec.
I did however try exporting an animation test for AE, but the same thing happens.

So, yeah I have the latest CS4 update.
My Open GL is always off.
Multiprocessing is usually on, but i tried it off - same results

So, Im pretty sure the footage is as good as im gonna get.

I can't really think of what else to try. Any more suggestions?
I can try upload an example to my vimeo page if that helps?

Cheers again.


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Dave LaRonde
Re: Weird Render problem
on May 18, 2010 at 3:06:36 pm

Got the field order right?

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


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andrew donaldson
Re: Weird Render problem
on May 18, 2010 at 8:32:41 pm

Hi Dave,

Yeah i've made that mistake many times and It's defo not that.

I've uploaded an example of the clip to vimeo.com but its gonna take a while til its ready...http://vimeo.com/11849013

Im still at a loss here!!

Cheers.


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Dave LaRonde
Re: Weird Render problem
on May 18, 2010 at 8:37:50 pm

Two additional things came to mind:

Double-check that the position of your AE layers is correct: in rare instances, it can cause blurriness. Go figure.

Here's the most probable one: check to see that you have the latest drivers for that Blackmagic card. This could be a Blackmagic problem & not an AE problem.

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


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andrew donaldson
Re: Weird Render problem
on May 18, 2010 at 10:39:01 pm

Hi, I just checked and there is a new blackmagic update, but it never made any difference.

Ive checked the layers and there's no problem there.

http://www.vimeo.com/11849013

Have you ever seen/had this problem?

Thanks again for all the suggestions, im sure there's something going on here!!

Andrew


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Theo Veltman
Re: Weird Render problem
on May 20, 2010 at 6:11:07 am

What effects are you applying to the footage? Have you applied an effect then turned it off but have "Effects" turned to "all on" in your render settings?


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steve martin
Re: Weird Render problem
on May 20, 2010 at 7:56:55 pm

Do you have Frame Blending turned on? I've had strange results when set to Pixel Motion sometimes, no idea why.


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andrew donaldson
Re: Weird Render problem
on May 20, 2010 at 9:43:41 pm

Hey!!

That's cracked it! I turned off frame blending in the output render module and bingo! thanks!

Cheers for all your help fellas!

Andrew.


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steve martin
Re: Weird Render problem
on May 21, 2010 at 5:52:46 pm

Cool, glad I could help. Sometimes motion blur and frame blending don't play nice together.


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