Editing > Timewarps > Creating and Modifying Timewarps in the Timelines >
Explicit and Implicit Timewarps

Timewarps can be created in two ways in the timeline:

- Explicit timewarps are manually added to segments.
- In Batch, implicit timewarps are automatically added to the record clip when you perform an overwrite edit that would cause a difference in the record segment duration. The timewarp is added to maintain the segment duration.

NoteYou can opt to have tails added to the inserted clip rather than a timewarp. See Timewarp.

Implicit timewarps always take precedence over explicit timewarps. If you create an implicit timewarp on a source clip that has an explicit speed change specified, the explicit speed change is ignored.

Working with Implicit Timewarps in Batch

Implicit timewarps are added to the record clip when an edit causes a difference in source and record durations, and when Auto Timewarp is enabled (see Timewarp). For example, if you perform a four-point edit with ripple off and the source clip duration is shorter than the record clip duration, a fit-to-fill edit occurs and the clip is timewarped to fit the new duration.

A fit-to-fill timewarp occurs during a fit-to-fill edit (when both source in and out points, and record in and out points are specified). The speed change is automatically calculated based on source and record durations. A portion of the record clip is replaced by a portion of the source clip such that the source material is timewarped to fit the duration of the record material being replaced. The heads and tails of the source clip are retained.

NoteA fit-to-fill edit with a negative speed change can be achieved by reversing the in and out points in the source clip, or by entering a negative value in the Speed field.

Creating Explicit Timewarps

You can create an explicit timewarp in the timeline by applying it to an existing segment.

To create an explicit timewarp:

1. Select the segment you want to timewarp.
2. Click the TW soft effect button or press Ctrl+T.

   An unrendered timewarp for the clip is created and the Timewarp quick menu appears.

   (a) Timewarp Type box(b) Speed field(c) Transition Render Mode box (d) Anchor box (e) Timewarp Processing option box

3. Set the Render mode to Progressive or Interlaced.
4. If you selected Interlaced, select an interpolation option. See Timewarp.
5. Select the type of timewarp—Variable Speed, Constant Speed, or Strobe. For information on creating strobe effects, see Strobing a Clip.
6. Define the speed for the timewarp in the Speed field.
7. If you want to reverse all the frames in the segment, click Reverse.

   The speed value changes to a negative number, indicating the frames are reversed.

8. If needed, enter a mix value in the Mix field.

   You can also create a timewarp that uses a variable mix value in the Timewarp Editor. See Creating Variable Speed Timewarps.