Adobe After Effects - Manual (Page 196)

Previewing
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Note:
Preview video and audio
Use RAM preview to play video and audio
RAM preview a specified number of frames
Save a RAM preview as a movie
Loop options for previews
Preview only audio
Use standard preview to play video
Manually preview (scrub) video and audio
Audio panel options
Additional tips and options for previewing
Move the current-time indicator (CTI)
Zoom in or out in time for a composition
Choose a viewer to always preview
Preview modes and Viewer Quality preferences
Preview modes and Fast Previews preferences
Fast Previews (CS5.5, and earlier)
Fast Previews | CC, CS6
Keyboard shortcuts for Fast Previews
Video Tutorial for Fast Previews
Viewer Quality preferences
Region of interest (ROI)
Work area
Snapshots
Preview on an external video monitor
Preview video and audio
Though it is common to speak of rendering as if this term only applies to final output, the processes of creating previews to show in the Footage,
Layer, and Composition panels are also kinds of rendering.
You can preview all or part of your composition as you work, without rendering to final output. Many of the controls for previewing are in the
Preview panel.
For additional keyboard shortcuts for Previews for use on a keyboard without numeric keypads in After Effect CS5.5, and earlier, see
Previews (keyboard shortcuts) .
Use RAM preview to play video and audio
RAM preview allocates RAM to play video and audio in the Timeline, Layer, or Footage panel at real-time speed. The number of frames that can
be stored for real-time playback depends on the amount of RAM available to the application and the settings in the Preview panel.
In the Preview panel, you can specify one of the following options:
RAM Preview Options
Shift+RAM Preview Options
For example, you may decide to set RAM Preview Options for full frame rate and full resolution, and set Shift+RAM Preview Options to skip one
out of every two frames and preview at half resolution.
In the Layer and Footage panels, RAM previews play untrimmed footage.
1. To modify RAM preview options, click the RAM Preview Options menu in the center of the Preview panel and choose RAM Preview Options
or Shift+RAM Preview Options. You can change any of the following:
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