Konkrete, chero frame inodzokororwa kutsva kuomarara uye palette inodzokororwa mushure meizvozvo, nekuti palette yakagadzirirwa ye pixel grid yacho inenge isina kunyatsoshanda kune grid yakakura. For an image you give a width and height in pixels; for a video you pick one of the preset sizes. It works from the original rather than from a previously resized copy.
Ndinogona here kuchengeta kuratidzwa kwechifananidzo, kana kumanikidza zvakajeka zviyero?
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Both. Lock the ratio and one dimension is derived from the other, which is what you want almost always. Unlock it and you get exactly the numbers you typed, at the cost of stretching — useful for a fixed slot, wrong for a photograph.