ELI5- why do screens/lights flicker in videos taken by phone or even yt vids, but not in movies and professional productions?
In: 674
Old screens like CRT monitors refresh the images line by line from one end of the screen to the other. Because the exposure time of your eyes is longer than the time it takes for the screen to refresh, you see it as a single image.
Video camera shutters are usually set to be much faster, while also capturing 24-60± frames per second. They only take in enough light during the time the shutter is open per frame to get part of the screen exposed. And because it captures many frames a second, it gives that flickering effect due to each subsequent individual frame not matching the previous every time.
If you use a longer shutter speed, it will reduce this effect by letting more light in per frame. You can also synchronize the frame rate of the camera with the monitor’s refresh rate.
Latest Answers