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pjc50 an hour ago

You can. I've even seen intentional 4:3 used as an "80s" signifier.

Quick googling suggested that square video under 3 minutes will be automatically classed as "shorts", which much of HN hates and may never have seen.

weinzierl 5 minutes ago | parent [-]

Not YouTube but regarding the period signifier:

Wes Anderson's "The Grand Budapest Hotel" has every section of the movie shot in the time appropriate aspect ratio.