ELI5- why do screens/lights flicker in videos taken by phone or even yt vids, but not in movies and professional productions?
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First off, lights connected through an outlet aren’t always on, the flicker to the frequency of your grid, so 50-60 hz depending on where you live, some cameras record in 25fps, with a 50hz system every frame will have light as 50 is a multiple of 25, on the other hand a camera recording at 25fps and a grid on 60hz will not match and this you will see flickering of lights when you record. That is a similar issue recording refresh rates on screens and cameras again. On most cameras you can change your fps to 25 (PAL option on iPhone) to accommodate for the flickering.
Production companies will makes sure that everything matches plus they have post production and what not
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