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I know, but I still wonder about level of soundproof/mechanical vibration and the level of mic and camera sensor isolation VS level of optical vibration. In addition sound can travel many different paths since it is mechanical vibration, and traveling through sound proof glass is not the only path. Anw cool project.

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I'm sure it's such a tiny amount that it isn't really relevant. Easy enough to test. Remove the bag of chips and just film the floor. See how much signal you can derive from that. Not exactly perfect science but gives a quick indication of "signal" that's reaching the system via other means.

Actually, what I think would be even better would be to record the bag of chips through the window, but play the sound outside where the camera is.

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