Create two parallel lines using the 4 cyan calibration points and their connecting lines and then hold down and drag the mouse the place the plane.
Shortcuts:
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Scroll: Switch line direction.
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S: Frame-by-frame (approximately) backwards.
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D: Frame-by-frame (approximately) forwards.
Tip: Press the 'Create/Delete canvas' button to get full access to the video's controls again.
Tip: Click on the video to get the four cyan calibration points, if they are not there or after pressing the 'Create/Delete canvas' button.