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Understanding trimming
You can trim (hide) footage at the beginning or end of a layer, changing which frames are first or last in the composition. The first frame to appear is called the In point, and the last frame is called the Out point.
A. Original In point B. Original Out point C. Out point after trimming D. Underlying (trimmed) footage or composition E. Original Out point reference
When you use a footage item as a source for different layers, you can trim it differently in each layer. Trimming does not alter the original source file.
Note: Trimming a still image layer changes the length of time the image appears in the composition; it does not crop the image (affect what portion of the image appears).
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