Quote:
I want to add a noise to a video
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if you want to add noise to a digital video you need to re-encode it and DEGRADE the image
there are video filters out there to make it look like a old silent movie
or to make it "look" like old time ANALOG TV
or to just add Gaussian noise using a filter
something like this
https://www.youtube.com/watch?v=uk0A8MxeVaY
Natron is a opensource program like Adobe After effects
http://natron.fr/