Correct Dimensions For 1080p, 720p, And 480p In Square Pixels

1080, 720, and 480 refer to the height of the video. But if you have, say, an MKV that is 1920×800 (2.40:1) then that MKV is considered a 1080. The reason the height of 800 puts this in the same category as a video with dimensions of 1920×1080 is that they both fit into the same box. The box for 1080p is 1920×1080. So when resizing you are always fitting videos into the 16:9 boxes of 1920×1080, 1280×720, or 854×480.

If you’re converting from 1920×800 to a 480p video, it would be incorrect to change the dimensions to 1152×480, as that exceeds the 16:9 box of 854×480. The correct dimension is 854×356. If you’re converting to 720p, then it would be incorrect to change to 1728×720. The correct dimension is 1280×534.

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