On the Bambulab A1 during a print in Bambu Studio if I go to the device section because I don’t see what the webcam is filming.
I only see a black box.
The webcam is activated from the menu but I’m not doing a time lapse.
Have you made sure the shutter is open?
yes the camera is free from the cover
hello i have the same problem with the bambu studio and with the app 
I discovered that by pressing Play under the black screen the camera starts working, but it takes about 2 or three minutes and this also happens on the app.
Even if it has terrible quality.
I was used to the sonic pad which was clearly superior
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It appears to be from lack of support for simultaneous connections to the camera. In my case it started after I enabled blob detection, and yours from time lapse.
thanks, solved the problem for me