ELI5- why do screens/lights flicker in videos taken by phone or even yt vids, but not in movies and professional productions?

Question

ELI5- why do screens/lights flicker in videos taken by phone or even yt vids, but not in movies and professional productions?

In: 674

Answer 1

In the old days we had a sync box which would send a timing signal to the camera and any TVs to make sure that the sync rate of the camera matched the TVs. A mismatched sync rate causes flicker.