7.1

790
Chapter 13 Special FX
Adjust to Length (Fit to Fill)
Instead of specifying a speed factor in the editor, you can define a length for the destination clip, e.g. if
you want to fill a gap of a specific duration on the Timeline.
1 Drag the Timewarp Editor to the appropriate clip.
2 Trim the clip to the appropriate length. Shortening it means accelerating the clip and lengthening
it means slow motion. Doubling the length = half speed (0.5).
3 If you wish to edit this clip further, open the Timewarp Editor.
Render Options
You can activate a number of options when rendering Timewarp effects. You will find these options in the
list box above the source clip inlay.
Render Options for Slow Motion
For play speeds below a factor of 1.0 (regardless of whether the value is positive or negative), you have
four options for rendering the decelerated material. If the source material was recorded on:
 interlaced Video (60/50 fields/second with NTSC/PAL), use Cut Fields or Mix Fields.
 film or progressive video (24/25 frames/second), use Mix Frames or Cut Frames.
For the best results, we recommend that you render short test clips using the different options. The fol-
lowing generally applies:
 Mix Fields (for interlaced video):
Motion is played back more smoothly but is not as sharply focused. In most cases, this is the best
choice.
 Cut Fields (for interlaced video):
Provides a sharper focus but motion can be slightly jerky.
 Mix Frames (for film/progressive video):
Provides smooth motion but is less focused.
 Cut Frames (film/for progressive video):
Provides sharp focus but motion is often jerky.