Apple Final Cut Pro 6 - Manual (Page 1146)

Chapter 17 Changing Clip Speed and Time Remapping 361
II
 Freeze frame (0 percent speed): So far, all these graphs have illustrated forward-playing
clips, represented by a line that slopes upward. A freeze frame, represented by a flat
line, may also be created with the keyframe graph.
 Reverse speed (less than 0 percent speed, or negative speed): When a clip plays in
reverse, previous frames of the video clip are mapped to successive frames of the
Timeline. Reverse speed is represented by a line that slopes downward.
 Acceleration/deceleration: Finally, the most powerful feature of the keyframe graph is
the ability to adjust the transition in a clip from one speed to another, at whatever
velocity you require. Gradual changes from one speed to another are represented by
curves. For example, a gradual transition from slow motion to fast-forward might
look like this:
Sequence time
Freeze frame
Sour
ce time
Sequence time
Re
verse s
peed
Sour
ce time
Sequence time
Acc
eler
ation
Sour
ce time