I wonder if there's an upper limit or if they just accept whatever you pump out. A Samsung Galaxy S10 for instance can do 2160p 60fps video. External webcams, like say Logitech c920, would be capable of 1080p 30fps. Built in webcams would be way lower, I guess.
Basically this is a production question. If, say, preparing a video stream to be seen over, say, QQ Video chat, how much can QQ take?