From the past several months I am using a best webcam in my computer which from Logitech and the model number is C910. Yesterday I tried to calibrate my webcam intended for face effects (e.g. video masks), I get a message telling to "place you face within the box... while the red dots appear lined up, push calibrate". However there were none red dots come into view! Does anybody know why? What could be the problem?
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