To create a fast- or slow-motion effect, change clip speed. Changing clip speed changes the clip’s duration. Speeding up a clip removes frames, thus shortening the clip duration. In the same way, slowing down a clip repeats frames and thus adds to the length of a clip. For audio clips, a change in speed also changes pitch. The Time Stretch command includes an option to maintain the original pitch of an audio clip at any speed.
You can change a clip’s speed using the Expert view timeline only. Not the Quick view timeline.
When you change the speed of a clip containing interlaced fields, you may need to adjust how Premiere Elements processes the fields, especially when the speed drops below 100% of the original speed.
The duration of a video or audio clip is the length of time it plays from its first frame (In point) to its last frame (Out point). The initial duration of a clip is the same as it was when the clip was imported or captured. Most often, you change a clip’s duration by trimming frames from either end. But you can also trim the end of a clip by designating a specific duration.
Unlike video, still images are not limited to the length of the original clip. You can set their duration to any length.
Reversing a clip plays the clip backward, Out point to In point. You can also reverse the clip and change its speed. In the Expert view, you can reverse a clip using the Expert view timeline. In the Quick view, use the Time Remapping feature to reverse a clip.