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From the book

Adobe Premiere Pro CC Classroom in a Book (2014 release)Adobe Premiere Pro CC Classroom in a Book (2014 release)

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From the book

From the book

Adobe Premiere Pro CC Classroom in a Book (2014 release)Adobe Premiere Pro CC Classroom in a Book (2014 release)

Learn More Buy
Changing speed and duration with time remapping

Changing speed and duration with time remapping

Time remapping lets you vary the speed of a clip by using keyframes. This means one portion of a clip could play in slow motion while another portion of the same clip plays in fast motion.

In addition to giving you flexibility, variable-speed time remapping enables you to smoothly transition from one speed to another, whether from fast to slow speed or from forward motion to reverse motion.

  1. In the Project panel, load the sequence 04 Remapping.

    2. The sequence has a single shot. As you add time adjustments to the clip, it will change length.

  2. Adjust the height of the Video 1 track by positioning the Selection tool over the split between audio and video tracks. Drag down to make more room to see the video tracks.

    3. Increasing the track height makes adjusting keyframes on the clip right in the Timeline much easier.

  3. Right-click the clip, and choose Show Clip Keyframes > Time Remapping > Speed.

    4. With this option selected, the white line across the clip represents the playback speed.

    Figure 4

  4. Drag the playhead on the Timeline to the point where the villain turns and starts walking across the room (about 00:00:10:00).
  5. Press and hold the Control (Windows) or Command (Mac OS) key as you hover your mouse over the white line.

    6. The pointer changes to a small cross.

  6. Click the white line to create a keyframe, visible at the top of the clip.

    7. You’re not changing the speed yet; you’re just adding keyframes.

  7. Using the same technique, add another speed keyframe at about 00:00:17:00, just as the villain points to the wall.

    8. By adding those two speed keyframes, you’ve divided the clip into three “speed sections.” You will now set different speeds between keyframes.

    Figure 5

  8. Leave the first section, between the beginning of the clip and the first keyframe, with a default Speed setting of 100%.
  9. Position the Selection tool over the white line between the first and second keyframes, and drag it down to approximately 30%.

    10. The clip stretches in length to accommodate the speed change.

    Figure 6

    NOTE

    If you have problems setting the speed keyframes, open the 04 Remapping Complete sequence to see the completed process.

  10. Choose Sequence > Render Effects in Work Area to render the clip for the smoothest playback.
  11. Play the clip. The speed changes from 100% to 30% and back to 100% at the end.

    12. Setting variable speed changes on a clip can be a very dramatic effect. So far, you have created a speed change that switches from one speed to another instantly. That can be highly effects but it’s possible to transition from one speed to another smoothly adjusting the speed keyframes.

  12. Speed keyframes are actually in two halves. You can click and drag to separate them. Try it now: Drag the right half of the first speed keyframe to the right to create a speed transition ramp.

    13. The white line ramps down now, rather than making a sudden change from 100% to 30%.

  13. Drag the left half of the second speed keyframe to create a transition there as well.
  14. Right-click the video clip, and choose Frame Blend. This smooths playback when changing the speed.
  15. Render and play the clip to see the effect.

NOTE

To remove a time-remapping effect select the clip and view the Effect Controls panel. Click the disclosure triangle next to the Time Remapping effect to open it. Click the toggle animation button (stopwatch) next to the word Speed. This sets it to the off position. A warning dialog appears. Click OK to remove the effect.

NOTE

You may need to adjust the height of the Video 1 track by positioning the Selection tool over the Video 1 track header and dragging the edge of the track up. This gives you more visible control over the keyframes.

TIP

With a Speed keyframe selected, you can drag the blue Bezier handles to improve the ramping to further smooth out the transition.

Recognizing the downstream effects of changing time

You may decide to change the speed at the beginning of the Timeline after assembling many clips in your sequence. It’s important to understand how changing the speed of a clip affects the rest of the clips “downstream.”

Speed changes can create several issues in your sequence:

  • Unwanted gaps caused by clips growing shorter because they are playing faster than they did originally.
  • Unwanted duration changes to the overall sequence because of the
  • Ripple Edit option.
  • Potential audio problems created by changes in speed–including changing pitch.

When you’re making speed or duration changes, be careful to view the overall impact on the sequence. You may want to change the zoom level of the Timeline to view the entire sequence or segment at once. Another option is to edit the clip into a new, separate sequence, and adjust it there. Then you can copy and paste the clip to put it back into the original sequence. This can help you focus on the clip you’re adjusting.

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