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The whole thing is subject to the expectation that video will be presented horizontally in 16:9 or 4:3 ratio.
The easiest way to envision it is to think of a physical TV, the screen size does not matter.
In order to display all of the content you need to scale it to fit either height or width.
Don't think about it as black bars, think about it as a black background that you are displaying content on top of.
The content is scaled to height and if the width of the content is smaller than the display area you see black because the content does not cover the background proportionately.
If it scales to height but the width is larger than the display area it continues to scale until the width fits but now you see black top and bottom.
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