Adobe Premiere Pro CS4 - Manual (Page 297)

291 USING ADOBE PREMIERE PRO CS4
Effects and transitions
Last updated 11/6/2011
Change clip speed and duration with Time Remapping
You can change the speed of the video portion of a whole clip. You can use Time Remapping to create slow motion
and fast motion effects in which the rate of speed varies.
1 In the track header of the video track containing the desired clip, click the Show Keyframes button. If it is not
selected, select Show Keyframes.
2 Click the Clip Effect menu triangle, and choose Time Remapping > Speed. (The Clip Effect menu triangle appears
next to the filename of every clip in a video track. If it is hard to see, zoom in to make enough room in the clip to
display it.)
A horizontal rubber band that controls the speed of the clip appears across the center of the clip.
3 Drag the rubber band upward or downward to increase or decrease the speed of the clip. A tool tip appears showing
the change in speed as a percentage of the original speed.
The playback speed of the video portion of the clip changes and its duration expands or contracts depending on
whether its speed is increased or decreased. The audio portion of the clip remains unchanged by Time Remapping,
although it remains linked to the video portion.
Note: When you lengthen a clip in a sequence by slowing its speed, it will not overwrite an adjacent clip. Instead, the clip
expands until it touches the edge of the adjacent clip. Adobe Premiere Pro then pushes remaining frames into the tail of
the lengthened clip. To recover these frames, create a gap after the clip and trim its right edge to reveal them.
Blend frames for smooth motion
Motion in a clip may appear jerky when you change the speed of a clip or output to a different frame rate. Turn frame
blending on to create new interpolated frames that smooth the motion. Frame blending operates only when there is a
mismatch between sequence and clip frame rates.
When frame blending is turned off, Premiere Pro duplicates frames to create the necessary interpolated frames. When
frame blending is turned on, Premiere Pro averages the frames to create the necessary interpolated frames.
Frame blending is on by default.
❖ Choose Clip > Video Options > Frame Blend.
Vary changes to speed or direction with Time Remapping
You can speed up, slow down, play backward, or freeze video portions of a clip using the Time Remapping effect. Using
speed keyframes, you can change speed numerous times within the same clip. Take a clip of a man walking, for
example. You can show him moving forward quickly, slowing suddenly, stopping mid-step, and even walking
backward, before resuming his forward motion. Unlike Clip Speed/Duration which applies a constant speed across the
entire clip, Time Remapping allows you to vary the speed throughout the clip. Also, you can ease in or ease out speed
changes.
You can apply time remapping only to instances of clips in a Timeline panel, not to master clips.
When you vary the speed of a clip with linked audio and video, the audio remains linked to the video, but remains at
100% speed. The audio does not remain synchronized with the video.