Apple Motion 5.1.1 - Manual (Page 352)

Chapter 9 Behaviors 352
Set Speed
The Set Speed behavior lets you change the speed (playback rate) of a clip. The speed specified
in the behavior begins at the behavior’s In point and exists for the duration of the behavior. The
clip continues playing at its default speed after the behavior’s Out point. For example, if the Set
Speed behavior begins at frame 60 and ends at frame 300, the clip plays normally until frame 59,
plays back at the rate specified in the behavior from frame 60 to frame 300, and then resumes
its default playback speed at frame 301. You can apply an “ease-in” or “ease-out” effect to the
speed change.
Parameters in the Inspector
•
Speed: A slider that sets the speed of the clip as a percentage. The default is 100% (the clip’s
normal speed). A Speed setting of 50% plays the clip at half speed.
Note: The Speed parameter can be keyframed to create variable playback rate changes.
•
Ease In Time: A slider that sets the number of frames over which the ease-in speed change
occurs (from the start of the behavior). The default value is 20 frames.
•
Ease In Curve: A slider that defines the curvature of the ramp when easing into the speed
change. A value of 0 creates a sharp transition to the new speed; a value of 100 creates the
smoothest ease in to the new speed. The default is 50%.
•
Ease Out Time: A slider that sets the number of frames over which the ease-out speed change
occurs (from the end of the behavior). The default value is 20 frames.
•
Ease Out Curve: A slider that defines the curvature of the ramp when easing out of the speed
change. A value of 0 creates a sharp transition from the new speed to the original speed; a
value of 100 creates the smoothest ease out. The default is 50%.
Strobe
The Strobe behavior simulates the look of a strobe light or lower-frame-rate video by holding a
number of frames as defined by the Strobe Duration parameter over the playback of the clip. For
example, when Strobe Duration is set to 10, frame 1 is held for 10 frames, frame 11 for 10 frames, frame
21 for 10 frames, and so on. The frames in between (2–10, 12–20, 22–30, and so on) do not appear.
Parameters in the Inspector
•
Strobe Duration: A slider that sets the number of frames to hold. A value of 1 plays the clip at
normal speed. The default value is 5 frames.
Stutter
The Stutter behavior randomly inserts hold frames, of random durations, into the playback of a
clip. The effect is similar to a tape that sticks during play in a videocassette recorder.
Parameters in the Inspector
•
Stutter Amount: A slider that sets the probability that a hold frame is generated at the given
frame. When set to 0%, no hold frames are created; when set to 100%, every frame is a hold
frame. Values between 0 and 100 indicate the probability of frames (within the duration of the
behavior) that are replaced by hold frames. The default value is 10%.
•
Duration Range: A slider that sets the maximum duration of hold frames. A value of 1 inserts
single-frame hold frames at a frequency determined by the Stutter Amount parameter.
Increasing the Duration Range increases the range of hold frames. For example, a value of 30
creates random hold frames with a minimum of 1 frame and a maximum of 30 frames. The
default value is 3 frames.
•
Random Seed: A button that picks a new random seed number. This number is used to
generate new values, based on the other parameters of this behavior.
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