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Example :-
640 x 480 square pixel 4:3 source
Want the height for a 640 wide square pixel 16:9 output.
Height = Width / Aspect ratio = 640 / (16 / 9) = 360
Therefore you need to crop 480 - 360 = 120 lines total. This can be 60 top and 60 bottom or 40 top and 80 bottom or anything else that adds to 120.
Basically you crop away 25% of the height going from 4:3 to 16:9 this way, this is why people crib a bit, like only crop 20% and then stretch a bit.
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