VISUAL QUICKPRO GUIDE PINNACLE LIQUID EDITION 6 FOR WINDOWS [Electronic resources] نسخه متنی

1.

Add the Dynamic Timewarp as described in the "To add a Dynamic Timewarp filter" task earlier in this chapter.

2.

Open the editor by right-clicking the bottom purple spotted line and selecting Edit dynamic TimeWarp.

3.

Once the editor is open, click the Fit Keyframe Viewers button to see both the mark-in and mark-out points of your clip inside the graph and to highlight the opening keyframe.

1.

Scrub to the point just before you want the speed to change; in this example, just before the boy's cap lifts off his head.

Now that you have found the correct position on the Timeline, you want to slow down to a quarter of normal speed.

2.

To adjust the speed, double-click the Speed value box, enter a value, and either click the Set Keyframe button or press Enter on the keyboard to apply this change.

3.

As you can see in

Figure 9.80 , in this example version, you should enter 0.25, the decimal equivalent of 25 percent or 1/4.

In the lower graph, notice that the blue line passes over the red line before it dips down toward the keyframe that was last added (Figure 9.81 ). This means the clip increases speed before it decreases.

This isn't what you want. You want it to play at normal speed and then dip down immediately to slow motion. To achieve this, you need to add a linear segment between the two keyframes.

1.

Select the keyframe before the one that holds the speed change (in this case the opening keyframe), and then press the Linear Segment button (Figure 9.82 ).

Now the clip does exactly what you want. It plays at normal speedindicated by the blue line in the bottom graph following the red linethen it dips suddenly down to 25 percent of normal speed.

At this point, you should exit the editor to check the results before moving on.

2.

To exit the editor, click the running man button in the top right of the interface.

After you render it, the clip plays fine except it now ends too early. This is another difficult area to understand, but put simply, when the Dynamic Timewarp slows something down, it adds frames to the clip to create something from nothing. But unlike the Linear Timewarp, Dynamic Timewarp doesn't alter the overall length of the original clip.

1.

Open the editor as described earlier in this chapter and click the Fit Keyframe Viewers button to realign the graph. If you are using the downloaded example, scrub through until you reach the point where the cap touches the ground. Enter "1" in the speed box and press Enter.

Now you have another problem. The bottom graph in the last parabolic curvebetween the slowdown keyframe and the normal speed keyframetouches the green line, indicating a speed of zeroa freeze-frame, in other words (Figure 9.84 ).

This isn't what you want. You need the clip to return to normal speed when the cap lands, for this example.

2.

Remove the parameter curve between the two keyframes by selecting the keyframe to the left of the one you added last and click the Linear Segment button (Figure 9.85 ).

Okay! Now if you exit the editor and allow it to render in this example, the cap falls in slow motion, but the boy jumps after it at normal speed.

However, because you've effectively increased the speedyou adjusted the clip from .25 to 1.0the opposite problem to the one you experienced when you decreased the speed occurs. The clip now shows a few more frames at the end than you want. This is because when speeding up a clip, Liquid Edition subtracts framesin this case, the frames it added during the slow motionbut again, Dynamic Timewarp doesn't alter the physical length of the clip.

3.

To solve this problem, trim the clip again, this time taking the mark-out point down the Timeline until the Master Viewer displays the correct frame for this clip's mark-out point.

When trimming a clip down the Timeline, you may notice that it doesn't need to be rendered. This is as good an example as any of how intelligent the Liquid Edition render engine can be.