Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 226

If you time-stretch a layer so that the resulting frame rate is significantly different from the original frame rate, the
quality of motion within the layer may suffer. For best results when time-remapping a layer, use the Timewarp effect.
See also
"Apply frame blending to a layer" on page 226
"Timewarp effect" on page 531
Time-stretch a layer from a specific time
In the Timeline or Composition panel, select the layer.
1
2 Choose Layer > Time > Time Stretch.
Type a new duration for the layer, or type a Stretch Factor.
3
4 To specify the point in time from which the layer will be time-stretched, click one of the Hold In Place options,
and then click OK.
Holds the layer's current starting time, and time-stretches the layer by moving the Out point.
Layer In-point
Holds the layer at the position of the current-time indicator (also the frame displayed in the Compo-
Current Frame
sition panel), and time-stretches the layer by moving the In and Out points.
Holds the layer's current ending time and time-stretches the layer by moving the In point.
Layer Out-point
Time-stretch a layer to a specific time
In the Timeline panel, move the current-time indicator to the frame where you want the layer to begin or end.
1
Display the In and Out columns by choosing Columns > In and Columns > Out from the Timeline panel menu.
2
3 Do one of the following:
• To stretch the In point to the current time, press Ctrl (Windows) or Command (Mac OS) as you click the In time
for the layer in the In column.
• To stretch the Out point to the current time, press Ctrl (Windows) or Command (Mac OS) as you click the Out
time for the layer in the Out column.
Time-stretch a layer but not its keyframes
When you time-stretch a layer, the positions of its keyframes stretch with it by default. You can circumvent this
behavior by cutting and pasting keyframes.
Make a note of the time at which the first keyframe appears.
1
In the Timeline panel, click the name of one or more layer properties containing the keyframes you want to keep
2
at the same times.
Choose Edit > Cut.
3
Move or stretch the layer to its new In and Out points.
4
5 Move the current-time indicator to the time at which the first keyframe appeared before you cut the keyframes.
Choose Edit > Paste.
6
AFTER EFFECTS CS3 220
User Guide