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— Pitch Correction checkbox: Checking this box will perform pitch correction on the audio attached to the clip so that while the audio duration is changed to match the picture speed, it will still sound natural. Be aware that pitch correction on large speed adjustments may not sound as good as pitch corrections made to small speed adjustments.
— Maintain Timing/Stretch to fit radio buttons: Choosing Maintain Timing leaves any keyframes within the clip locked at their original position, while choosing Stretch Keyframes results in all Composite, Transform, and Cropping keyframes being compressed or stretched by the same percentage as the clip during a speed change.
Speed Change Controls in the Video Inspector
You can also change the speed of your clip directly in the Video Inspector’s Speed Change controls. This method has the benefit of being available in both Cut and Edit pages.
— Direction: Selects the desired motion of the clip, forward, backward, or freeze frame.
— Speed %: Adjusting this slider changes the clips motion on a percentage basis. This value can be keyframed.
— Frames Per Second: Adjusting this slider changes the clips motion by increasing or decreasing the number of frames per second to play the clip back at. This value can be keyframed.
— Duration: You can directly select how long you want the clip to be by setting a specific duration here in HH:MM:SS:FF format. This will then automatically adjust the speed of the clip to playback all frames in that exact amount of time.
— Ripple Sequence checkbox: If you want the speed change you’re about to make to ripple the Timeline, pushing or pulling all clips following the current one to accommodate the clip’s new size, then turn on the checkbox.
— Pitch Correction checkbox: Checking this box will perform pitch correction on the audio attached to the clip so that while the audio duration is changed to match the picture speed, it will still sound natural. Be aware that pitch correction on large speed adjustments may not sound as good as pitch corrections made to small speed adjustments.
The Speed Change controls in the Video Inspector