Why do lines moving down appear on a computer screen whenever it is filmed?
Answers:
Because a computer is actually flashing at 60 frames per second or so, which can't be seen by the naked eye. A camera can see that. That's what the lines are. Frames.
Because the frame rate speed on a video camera is different than that of a computer monitor. The speeds don't match, so you see wavy lines going up and down.
Same thing happens if you hum loudly and deeply while looking at a digital clock, or your computer monitor.
i think the camera lens is faster then the human eye so the refresh rate of the monitor can be detected or viewed by the camera just guessing
Frequency. The frequency of the screen and the frequency of the camera are not syncronized.
It's based on the frames per second. A computer and video card has a lower frame per second as say a TV. So the lines you see when a monitor is filmed is the picture refreshing it self. But as you look at it with a naked eye. You don't see that.
Your monitor by default updates 60 times per second or 60Hz. Video cameras can detect higher frames rates. If you have a CRT monitor, you can increase the refresh rate to reduce the moving lines.
If you want to film it, it is best to connect your video card directly to a recording device. Then, you will not have any flickering or moving lines.
the speed/ refresh rate of the computer monitor and the camera are not the same.
it's called a refresh rate. turn it up to as high as u can.
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