Editing > Timewarps >
Creating Timewarps on the Desktop

Use the Timewarp command on the Desktop to speed up or slow down the action in a clip by decreasing or increasing the number of frames. You can also use the timing curve in the Timewarp Editor to produce more complex timing effects. For example, reverse the action in a clip or vary the rate at which the action occurs.

From the Desktop, you can create a timewarp by mixing frames together or by blending frames using an motion estimation option. For information on using motion estimation, see Creating Motion Estimation Timewarps.

To create a timewarp by mixing frames:

1. In the Main menu, click Editing.
2. In the Editing menu, click Timewarp.
3. Select the source clip.

   The Timewarp menu appears to the right of the Main menu.

   (a) Speed field(b) Frames field(c) Timewarp Processing option box(d) Mix Range field(e) Progressive/Interlaced option box(f) Render Mode box(g) FPS field

4. Select Mix from the Timewarp Processing option box.
5. Set the range for the mix in the Mix Range field.

   In the timewarped clip, each frame is mixed with its preceding and succeeding frames and produces a trail effect. The Mix Range field specifies the range of frames to be used in the mix. Use a higher value to produce more of a trail effect.

   The following examples illustrate the difference between mix values of 5 and 25.

   Triangle moves across the screen from left to right.

   Same frame of animation with a mix value of 5.

   Same frame of animation with a mix value of 25.

6. Set the length, frame rate, and speed of the timewarped clip by changing the values in one or more of the following fields. Changing a value in one field causes the other fields to update automatically.

   To: | Enter:
   --- | ---
   Adjust the source clip to the specified number of frames | A number of frames in the Frames field.
   Play the source clip at the specified frame rate | A frame rate in the FPS field.
   Measure the timewarp as a percentage of the source clip | A percentage in the Speed field. A speed of 100% has no effect on the source, while a speed of 50% results in a timewarped clip that is twice as long as the source (and plays back half as fast).

7. To play the timewarp in reverse, enable Rev.
8. From the Progressive/Interlaced Render box, select to render in frames or fields.
9. If you selected Interlaced in the previous step, set an interpolation option. See Timewarp.
10. Use the Render Mode box to determine when timewarps are rendered.

    Select: | To:
    --- | ---
    Rendered | Always render timewarps.
    Unrendered | Never render timewarps. Timewarps will remain hidden until the clip is rendered using the Force Render command in the Editing menu. Select Unrendered if you want to edit the timewarp later in the Player or Batch timeline.

11. Select a sampling option. See Timewarp.
12. You can now create the timewarp according to the values you set or modify the values further in the Timewarp Editor:
    - To create the timewarp, select the destination reel.
    - To modify the timewarp values, click the Timewarp button. The “E” (Editor) button next to the Timewarp button is enabled. Select a destination reel. The Timewarp Editor appears. See Modifying Timewarps with the Timewarp Editor.

#### Topics in this section

- Aborting Timewarps and Unrendered Frames
- Modifying Timewarps with the Timewarp Editor