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Lesson 5. Horror Festival Ad > Using the Time Stretch command

Using the Time Stretch command

After viewing the House.mov footage, you will increase the duration by employing the Time Stretch command. Time stretching a layer slows it down or speeds it up.

  1. Double-click the House.mov footage item in the Project window, and play the movie.

    The footage looks a little too flickery—a little variation in the house layer is desirable, but not this much. To slow down the flicker, you will time stretch the House.mov 300% and apply frame blending to keep the results from being too jerky.

  2. Close the QuickTime Footage window.

  3. Select the House.mov layer in the Time Layout window, and then choose Layer > Time Stretch.

  4. In the Time Stretch dialog box, enter 300 for the Stretch Factor.


    Figure .


    This increases the duration of the layer by 300% and redistributes the original frames along the new duration, interpolating the in-between frames. If you rendered a movie now, you would notice the flicker slowing by a factor of 3.

  5. Make sure Hold In Place is set to Layer In-point, and then click OK.

    The layer increases in duration from the In point. Notice the new Out point for the layer duration bar in the Time Layout window.

  6. Display the In and Out panels by clicking the Optional panel button to the right of the Switches/Modes button, and verify that the value in the Time Stretch box is 300%. Close the In and Out panels.

    Figure . Time Stretch box

  7. Display the Layer Switches panel again by clicking on the Switches/Modes button again.

  8. Smooth out the interpolated motion: in the Layer Switches panel inside the Time Layout window, select the Frame Blending option for the House.mov layer. You won't see the effect of this smoothing until you enable frame blending later in this lesson.

    Figure . Frame Blending option

    Frame blending generates cross-fades between original frames to create smoother playback of time-stretched or time-remapped frames.

    The layer is still not quite long enough. You will set it to loop 2 times using the Interpret Footage dialog box.

  9. Activate the Project window, right-click (Windows) or Control-click (Mac OS) the House.mov footage item, and then choose Interpret Footage > Main. Under Looping, enter 2 to make the footage loop twice, and click OK.

  10. To increase the duration of the layer, drag the Out point at the right end of the House.mov layer duration bar in the Time Layout window to 04:00 on the time ruler. Watch the Info palette to confirm the time position of the Out point.


    Figure .



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