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I believe that the problem is your camera sensor isn't senstitive enough for those dark scenes. This then would be a noise issue of the sensor. My basic understanding is that faults in the sensor (they all have them) cause spikes randomly in the pixels. This can occur both in low light situations and long exposures.
You might be able to put a filter on the content to reduce the noise. I am not familiar with how to do that though. Try an internet search for something like 'video noise reduction'.
P.S.
I once bought and returned a digital still camera that had this problem. After a bit more research I found a better camera.
Video is more challenging I think because you are asking the camera to take an image approximately every 1/30 of a second, so your only control available would be ISO setting, and aperture opening. Increasing ISO brings more noise with it just like faster film does. I think this setting would only be available as 'Night Shot' mode on a consumer camera which have limited if any controls for this problem.
^ Thanks, one thing worth mentioning is that I was editing footage for someone else. They have a much better camera than me, a small professional one - maybe they didn't have it on the right setting.
I'm more than happy with my little Panasonic - no noise on that.
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