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I am guessing this are just mistakes due to the USB connection of your webcam. Prolly it takes some times more than 30 ms to actually put the frame content on the window, and give the window time to refresh, which actually causes the error.

I have done some research and two solutions have been suggested on other fora:

1. Increase the time to 50 ms seems to work for most USB webcams fluently.
2. Sometimes it seems that the webcam driver is outdated. Try updating.

Hopefully someone has experienced same problems, I havent met it yet.