Final Cut Pro HD | H•O•T Hands-On Training [Electronic resources] نسخه متنی

1.

Open Chapter 10 Lesson, if it isn't open already. Double-click Seq Variable start to load it into the Timeline.

[View full size image]

2.

Double-click Track The gap to load it into the Viewer. Click the Motion tab to make it active. Expand the width of the Viewer so you can see the keyframe section. Twirl down Time Remap so you can see the green diagonal line from beginning to end.

This green line represents the speed of your clip, with the two keyframes at the beginning and end representing the In and the Out of the clip.

A few other notes:

A constant speed change always changes the duration of a clip; a variable speed change does not.

A constant speed change always changes the audio; a variable speed change does not.

And, finally, when you make a constant speed change to a clip, only those frames between the In and the Out are affected. When you make a variable speed change to a clip, all frames before or after the Out can be affected.

3.

Using the Arrow tool, Option+click where you want your speed changes to occur. Place four keyframes, equally spaced along the line.

Again, this is art, not science, so a little trial and error is necessary as you figure out the best place to put keyframes. In this exercise, where you put your keyframes is not important. In my classes, I tend to place them equally across the line, which makes illustrating my point easier.

4.

Now, position your keyframes:

Drag the third keyframe down, slightly, so the angle of the line decreases.

Drag the fourth keyframe down, so that it forms a flat line compared to the third keyframe.

Drag the fifth keyframe down, so that it moves diagonally down and to the right.

5.

Variable speed changes are played back in real time on most systems, so play your sequence and watch what happens as the angle of the line changes.

The first segment plays normally, the second slows down, the third stops, the fourth plays in reverse, and the final segment runs many times faster than full speed.

6.

Adjust the angles and move the keyframes and watch the results. Then, set an In and Out and see what effect that has on where your clip starts and ends.

Right. The Out had no effect. A variable speed change to a clip starts at the In and ignores the Out in order to give you the speed changes you request.

For instance, if you froze the first frame of a clip, the entire clip would consist of just the In.

If you ran the clip in reverse, the clip would start at the In and play backwards.

If you ran the clip forward at high speed, the clip would start at the In and play all the frames it needed, including those after the Out, in order to fulfill the duration of the clip.

7.

That ends this exercise. Save your work, if you wish. Quit Final Cut, if you need to take a break. There's one more exercise still to come: making moves on still images.