The ratio of short video with vibrato is 16:9, which gives people a sense of comfort.

The audio-video ratio is generally 16:9, because Tik Tok's words come from a, er, vertical screen platform, which is more comfortable to watch. If it is a landscape screen, you have to turn the phone upside down, which is not as comfortable as the touch screen. So Tik Tok's words are 16:9, which is better, but very comfortable.