@selea @thomasfuchs @Gargron there's multiple reasons 4k isnt implemented... one of the main ones is please remember the fediverse is not just mastodon!! other instances have a stake in it all as well, so things have to remain compatible
besides, as somebody whose eyesight is poor enough that 4k vs 1080p vs 720p really doesn't make much difference I'm happy with whatever we currently have
4k videos also use a considerable amount more power to decode... I don't want to be unknowingly decoding 4k video client-side... there is an energy crisis at the moment you know!