Jello vision:

GoPro (and a few others) picked CMOS sensors for their video cameras rather than CCD sensors. CCD sensors can capture the entire image at one moment (global shutter). CMOS sensors progressively capture portions of the image over time (rolling shutter).

For high motion video, or video in which the camera or subject is vibrating, the rolling shutter can create very significant visual distortion.

You might want to drink some ginger ale before watching this demo video.

The person who made this video made content choices that highlight the deficiencies of CMOS. (People in the video equipment business are quite adept at finding ways to highlight flaws in other people's shit.) But this distortion is *always* present in CMOS-based cameras. The distortion is below the visual threshold in scenes with very little motion or vibration. But in anything with significant movement it's an ugly, shitty artifact that could be easily avoided with the right equipment.

The fact that many of the people who make sports cameras chose the wrong sensor technology pisses me off to no end. I hate having to watch video that is fucked up by their ineptitude.