Apple Final Cut Express HD - Manual (Page 755)

Chapter 52 Changing Clip Speed 755
IX
Speed Settings
Applying a constant speed change to a clip alters the entire clip’s playback speed by
the same percentage. For example, applying a speed setting of 25 percent to a clip
makes the entire clip play in slow motion. Constant speed changes are useful when
altering a clip’s timing to fit a larger or smaller gap in your sequence, or when trying to
achieve a consistent speed change across an entire clip (making a car seem faster or
slower, for example).
Constant speed changes also alter the duration of a clip. If a constant speed change
causes the duration of a clip in a sequence to become longer or shorter, all clips
coming after it ripple forward or back according to the ripple editing rules in
Final Cut Express HD. For more information about rippling clips in a sequence, see
“
Performing Slip, Slide, Ripple, and Roll Edits ” on page 453.
All constant speed changes between 1 and 200 percent can be played in real time,
even with frame blending turned on. For more information on applying constant speed
settings, see “
Making Speed Changes ” on page 757.
Important: Final Cut Express HD does not support variable speed changes.
Frame Blending and Reverse Speed
Duplicating frames to create slow motion can result in a strobing, jittery effect. To
minimize this, you can turn on frame blending in the Speed dialog. When slow motion
is created, frame blending uses the two frames that appear to either side of duplicate
frames and creates new in-between frames that are a composite of both. By inserting
blended frames in place of frames that have simply been duplicated, slow-motion clips
appear to play back more smoothly. Speed changes can still play back in real time with
the Frame Blending option turned on.
Original Blended frame Original