After Effects: Drawing a mask with the Rectangle tool

Demo summary
The demo shows selecting a video layer and drawing a rectangle to mask out unwanted edges of the footage.
Step-by-step
- Select the video layer in the timeline
- Select the Rectangle tool from the toolbar
- Click and drag on the composition to draw the mask shape
- Release the mouse to trim the footage outside the rectangle
Options
- Start the mask drawing from any point on the screen
Tips
- Start drawing slightly outside the frame to ensure the edges are fully covered
- Draw the rectangle upwards to ensure vertical elements like steam are fully captured
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After Effects