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Specify the distance between the cropping rectangle and the top edge of your overlay video's frame. To position the cropping rectangle along the top edge: Keep blank, or enter 0. To position the cropping rectangle down, relative to the top edge of your overlay video's frame: Enter an integer representing the Unit type that you choose, either Pixels or Percentage. For example, when you enter 10 and choose Pixels, the cropping rectangle will be positioned 10 pixels from the top edge of the overlay video's frame. When you enter 10, choose Percentage, and your overlay input video is 1920x1080, the cropping rectangle will be positioned 108 pixels from the top edge of the overlay video's frame.