What is flicker in video, flicker in video is undesirable visual artifact where brightness or color fluctuates rapidly between frames, causing image to appear to flash, pulsate, or strobe, making video look unprofessional and causing eye strain. Flicker in video can be caused by several factors, including mismatched frame rate and artificial lighting frequency, for example shooting under fluorescent or LED lights that flicker at 50 or 60 Hz with camera shutter speed not synchronized causing brightness variation, or using auto exposure that changes exposure frame to frame, or time lapse where exposure changes between shots causing flicker. In video, flicker appears as rapid bright dark changes, especially noticeable in slow motion or time lapse. To prevent flicker in video, use manual exposure, match shutter speed to lighting frequency, use flicker free lights, use anti flicker setting in camera, and in post production use deflicker filter in editing software like Premiere Pro or DaVinci Resolve to smooth brightness. So flicker in video is brightness fluctuation artifact causing flashing effect, undesirable in professional video, caused by lighting and exposure mismatch, needing prevention during shooting and correction in editing.
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