Decreasing rendring time


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Decreasing rendring time
by kfirluvko on Sep 13, 2007 at 1:23:14 pm

Hey i have this annoying problem i cant figure out, i have a project which has 9 precomps in it and is about 20 seconds long, no mattar what i do the rendering time is very long(about 4 hours long).
I tried decreasing the motion blur amount and enabled it only for the layers which use it.
I am also not rendering in the best quality to save time are there any other effective ways to render faster and keep the quality of the movie high?

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Re: Decreasing rendring time
by Todd Kopriva on Sep 13, 2007 at 1:46:54 pm

There's a whole section of After Effects Help dedicated to tips on improving performance: "Improve performance".

I hope that something in there helps.

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Re: Decreasing rendring time
by Darby Edelen on Sep 13, 2007 at 3:33:53 pm

Here are a few pointers:

Time based effects such as 'echo' increase render time dramatically.

Some video codecs use interframe compression in which the current frame may not be a full frame (I Frame) but actually an intermediary frame (P or B Frame) that holds information about what has changed since the last full frame. Basically what this means is that, although the file size of the compressed video is smaller, AE has to take lots more time to render the intermediary frames. The major family of codecs that use this scheme are MPEG and its derivatives MPEG-2, H.264, AVC, HDV, etc. Instead of using MPEG footage in your AE project, consider transcoding to a high-quality, intraframe compressed codec such as Photo JPEG at Max quality.

If there are animations/effects going on in your pre-comps then these will obviously add to render time. You should consider pre-rendering your pre-comps (Composition>Pre-Render) once they are finalized. Note that this will not work properly if the pre-comp has its "Collapse Transformations" switch on in the final comp.

Shadows increase render time significantly, do you need lights? Is there a way to fake it that will look just as good? You can also consider decreasing the Shadow Map size in Composition Settings>Advanced>Options>Shadow Map Resolution.

Darby Edelen
DVD Menu Artist
Left Coast Digital
Aptos, CA

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Re: Decreasing rendring time
by Dave LaRonde on Sep 13, 2007 at 4:10:05 pm

Any motion blur AT ALL increases render time. So will other things....

Got 3D layers? That'll increase render time.

Using lights that cast shadows? That'll increase render time.

Using multiple lights? That'll increase render time.

Using BIG layers? That'll increase render time.

Have multiple effects on layers? That'll increase render time.

Working in HD? That'll increase render time.

You can avoid overly-long render times by prerendring some of those precomps you're using. That'll save you some time.

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