Why is my HDR AS15 so grainy?

Hello, I was using my SONY HDR AS15 action cam to film and I notice the quality on 1080p is horrible. It is all grainy and feels like recording from a 90s cell phone. I see a lot of youtube videos where the AS15 out performs a gopro3 black. I have both action cams and my AS15 is not nearly as high quality as the... show more Hello, I was using my SONY HDR AS15 action cam to film and I notice the quality on 1080p is horrible. It is all grainy and feels like recording from a 90s cell phone. I see a lot of youtube videos where the AS15 out performs a gopro3 black. I have both action cams and my AS15 is not nearly as high quality as the gopro3 black. My settings are 1080p HD, steady ON, 120 fov.
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