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Mac shutting down during After Effects render?

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Daniel FoxMac shutting down during After Effects render?
by on Feb 3, 2010 at 9:09:52 am

I've been rendering videos in the render queue in After effects and I leave it there and when I come back after a long time my iMac is unresponsive. Clicking the mouse, tapping the keyboard does nothing. I press the power button and the iMac boots up like a fresh start and I check to see if the videos rendered and they didn't. I have also set the energy saver sleep mode to never and it didn't make a difference. If I stay at the computer and constantly check up on it by moving the mouse and checking the screen the rendering does finish.

What is causing my iMac to turn off and what can I do to prevent this and find out what's really going on?

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Dave LaRondeRe: Mac shutting down during After Effects render?
by on Feb 3, 2010 at 4:57:05 pm

Check the kind of footage you're using in AE and read the following. You could have made a very common and fundamental error:

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, 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.

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

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