How do live pictures work and have “video” of things before the capture button is pushed?

Question

Is the camera somehow always on?

In: Technology

Answer 1

Think about Xbox game clips, the moment you turn on the console it starts recording, when in reaches 5 minutes it starts to delete from the first seconds and replacing it with the new recorded one so that whenever you press the button, you’ll have exactly the last 5 minutes.

Now back to live pictures, same thing. The camera app is Continually recording the last few seconds when it’s in live mode and whenever you hit the button, you get those seconds with your photo.