Adobe After Effects - Manual (Page 647)

Note:
computer system and compositions.
When After Effects temporarily disables multiprocessing with Render Multiple Frames Simultaneously
If After Effects can’t use background processes to render multiple frames simultaneously, a message appears in the Info panel, and After Effects
uses only the main foreground process to render all frames. These messages include the following:
“Insufficient RAM. Multiprocessing is off.”
“Incompatible effect or expression. Multiprocessing is off.”
“Incompatible preview mode. Multiprocessing is off.”
“Incompatible composition. Multiprocessing is off.”
In general, the reasons for After Effects temporarily disabling Render Multiple Frames Simultaneously multiprocessing fall into these categories:
The rendering of a single frame requires more RAM than is available to the individual background processes.
The project uses OpenGL for rendering of previews or final output. The Render Multiple Frames Simultaneously multiprocessing feature
works by using background processes on multiple CPU processor cores to render frames, whereas rendering with OpenGL works by moving
processing to the GPU. (See
Render with OpenGL .)
The composition uses an effect that relies on GPU processing. These effects are generally effects implemented with Pixel Bender.
The composition contains a live Photoshop 3D layer. (See Using 3D object layers from Photoshop.)
The composition uses an effect with a temporal component that renders much more quickly when the rendering process has access to a
cache of previous frames. These effects include some effects with a Temporal Smoothing option.
The composition uses an effect with a temporal component that requires frames to be rendered in strictly sequential order.
If a composition uses any of the following effects, the composition will not be rendered with the Render Multiple Frames Simultaneously
multiprocessing feature:
Auto Color
Auto Contrast
Auto Levels
Cartoon
Lens Blur
Particle Playground
Shadow/Highlight
Some third-party effects—such as CC Time Blend and RE:Vision Effects Video Gogh—are also incompatible with the Render Multiple
Frames Simultaneously multiprocessing feature.
Memory pool shared between After Effects, Premiere Pro, Encore, and Adobe Media Encoder
After Effects shares a memory pool with Adobe Media Encoder, Premiere Pro, and Encore. This is indicated in the Memory & Multiprocessing
preferences panel by the icons for each of these applications at the top of the panel. The icons are dimmed for the applications that are not
running.
A memory balancer prevents swapping of RAM to disk by dynamically managing the memory allocated to each of the applications. Each
application registers with the memory balancer with some basic information: minimum memory requirements, maximum memory able to be used,
current memory in use, and a priority. The priority has three settings: low, normal, and highest. Highest is currently reserved for After Effects and
Premiere Pro, when it is the active application. Normal is for After Effects in the background or Adobe Media Encoder in the foreground. Low is for
background servers of Premiere Pro or Adobe Media Encoder in the background.
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