Substituting a placeholder for footageA placeholder appears in After Effects as a still image of color bars. You can apply a mask, effects, and geometric properties to a placeholder. When the actual footage item becomes available, you can replace the placeholder with it, and the applied attributes and keyframes are transferred to the actual footage. For best results, set the placeholder to exactly the same size, duration, and frame rate as the actual footage. To use a placeholder:
To replace a placeholder with the actual footage:
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