I'm using the Global Developer 8.11.29
Officially the Xiaomi Mi 8 supports up to 240fps but with the new updates we have the possibility to record at 960fps.
With this modality we can record about 5 seconds and the first seconds of the final clip will be played at normal speed and the final seconds will be played in slow motion.
The video quality is 1080p. So i was very excited...at the beginning.
But as i suspected... the video aren't in 960fps, but everything is slowed down by software.
So probably it's a 240fps fps slowmotion and then we have a digital editing that applies a kind of plugin, as the famous Twixtor and Optical Flow for computers.
So at the end the result is ugly too see and you need perfect conditions to achieve a good effect.