Video is captured at a constant rate. Meaning that the camera can’t change the amount of time each frame is exposed. This rate is chosen to keep the video moving smoothly but is usually suboptimal for a high quality image. Being unable to change exposure time means the camera has to change its aperture or gain to correct exposure. Most non professional cameras don’t have very good apertures, which leaves gain as a primary exposure control. Increasing gain is the lowest quality method of exposure compensation. On top of that, the exposure time in video allows formore motion blur than higher speed exposures which makes the image look slightly blurry compared to a fast exposure with good lighting.
Tldr; a fixed exposure speed is not an ideal method for image capture.
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