Editing and Nesting Effects
You can edit effects in the Timeline. Effects editing techniques fall into the following basic categories:
  Motion effects, such as freeze-frame and slow-motion or fast-motion effects, involve applying frame-motion parameters to selected footage, usually on a single video track.
  Transition effects, such as dissolves and wipes, involve transitioning from one edited clip to another on the same video track.
  Segment effects, such as picture-in-picture, keys, or color effects, are applied to whole segments. They commonly require multiple layers of video.
  For more information on effects editing, see Main Topics: Basics of Effects Editing.
When editing effects, you can use a procedure known as nesting. This involves opening up effects to reveal added layers for combining multiple images and digital video effects. When the effect is applied, you can close it to view and render the effect as one segment on the track.
  For more information on nesting techniques, see Nesting Effects.

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