Adobe After Effects CS3 - Manual (Page 72)

AFTER EFFECTS CS3
User Guide
67
Importing video and audio
Work with the media cache
When After Effects imports video and audio in some formats, it processes and caches versions of these items that it
can readily access when generating previews. Imported audio files are each conformed to a new .cfa file, and MPEG
files are indexed to a new .mpgindex file. This greatly improves performance for previews, because the video and
audio items do not need to be reprocessed for each preview.
Note: When you first import a file, you may experience a slight delay while the media is being processed and cached.
Adobe Premiere Pro asset Converted to in After Effects Notes
Motion or Opacity values and keyframes Transform property values and keyframes Keyframe type—Bezier, Auto Bezier, Contin-
uous Bezier, or Hold—is retained.
Video effect properties and keyframes Effect properties and keyframes, as long as
the effect also exists in After Effects After Effects doesn’t display unsupported
effects in the Effect Controls panel.
Crop filter Mask layer
Video and audio transitions Opacity keyframes (Cross dissolve only) or
solids
Volume and Channel Volume audio filters Stereo mixer effect Other audio filters are not converted.
Speed property Time Stretch property Speed and time stretch have an inverse rela-
tionship. For example, 50% speed in Adobe
Premiere Pro is converted to 200% stretch in
After Effects.
Frame Hold Time Remap
Clip marker Layer-time marker
Sequence marker Markers on a new solid layer To copy sequence markers, you must either
copy the sequence itself or import the
entire Adobe Premiere Pro project as a
composition.
Audio track Audio layers Audio tracks that are either 5.1 surround or
greater than 16-bit aren’t supported. Mono
and stereo audio tracks are imported as one
or two layers.
Color mattes Solids
Time Remapping effect Not converted
Titles Not converted
Bars and tone Not converted
Universal counting leaders Not converted