Keyframe Motion Effects
Like most video editing applications, Apple's Motion program lets you to create effects using keyframes. This allows you to control the behavior of effects that you add to your video. Motion also supports keyframes for multiple aspects of a given effect. For example, if you insert a light source, you can use keyframing to change its brightness and its shape simultaneously. Motion stands out among video editors in that it offers an interface that graphically represents keyframes and provides options for keyframe manipulation.
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Applications
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Keyframes can be useful in any aspect of video editing. Most commonly, they help determine video and audio transitions such as fading in or out. You can also use keyframes to control zooming, pan across a frame, alter color values or make text gradually appear and disappear. You can also use them to animate your content. For example, you can make any object you insert move within the frame using keyframes to define its path.
Interface
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When you insert keyframes, Motion adjusts the item in question so that it smoothly changes from the starting value to ending value of your choice. It does this by inserting frames called "in-betweens." While Motion does this automatically, you can edit these frames to your specifications in the program's Keyframe Editor. The editor displays a graph or a "curve" that represents both the keyframes and the in-betweens. It also lets you click and drag the graph to fine-tune your edits.
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Creating Keyframes
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According to Apple, the simplest way to add keyframes in Motion is to press the record button and make changes in the canvas. The canvas is the window that displays your video. Every time you make a change in the canvas with record enabled, Motion automatically inserts a keyframe and creates the necessary in-betweens. You can also insert keyframes using the inspector or the heads up display. These show the numerical values associated with certain aspects of your video, including your keyframes, and provide adjustment controls.
Tips
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If you use keyframes for multiple effects, you can compare the behavior of each effect in the keyframe editor. To do this, select the items whose keyframe effects you want to compare. You can make this selection in either the layers tab, canvas or timeline. The keyframe editor overlays the curves for these effects. This is helpful when you need to synchronize different effects, such as making audio and video fade out at the exact same time.
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