The Rate Stretch tool provides a quick method to change the duration of a clip in the Timeline while simultaneously change the clip's speed to fit the duration.
For example, you might have a gap in your sequence of a specific length and you want to fill that gap with some speed-altered media.
Keyframes are used to set parameters for motion, effects, audio, and many other properties, usually changing them over time.
A keyframe marks the point in time where you specify a value for a layer property, such as spatial position, opacity, or audio volume. When you use keyframes to create a change over time, you typically use at least two keyframes—one for the state at the beginning of the change, and one for the new state at the end of the change.
To enable frame blending, choose Clip The duration of a clip is the length of time it takes to play from the In point to the Out point.
You can set a duration for video or audio clips, letting them speed up or slow down to fill the duration.
Consider making this adjustment especially when the speed drops below 100% of the original speed.
(See Create interlaced or non-interlaced clips.) You can use frame blending to smooth the appearance of a speed effect that changes the time or frame rate of a clip.
When the keyframe navigator box is filled with a diamond, the current-time indicator lies precisely at a keyframe for that layer property. In Graph Editor mode, the appearance of a keyframe icon depends on whether the keyframe is selected, unselected, or semi-selected (another keyframe in the same property is selected). Unselected keyframes retain the color of their corresponding graph.
When the keyframe navigator box is not filled , the current-time indicator lies between keyframes. Semi-selected keyframes are represented by a hollow yellow box.
If you change the value for a layer property while the stopwatch is inactive, that value remains the same for the duration of the layer.