Recently when I’ve opened Photo Booth app for recording video log, I’ve seen one error message that “There is no connected camera.”. If you happen to see this message, don’t worry. This is not hardware failure.

It’s worth mentioning that you can often fix the error by simply rebooting the Mac. If you have the time for that, just reboot, it will almost certainly resolve the issue. But it’s long way to solve this problem. Isn’t it?

To fix this issue, open your terminal and type:

$ sudo killall VDCAssistant

Your camera should start working. Still it’s showing same error? Hit below command-

$ sudo killall AppleCameraAssistant

And if the issue still not resolved, restart the app.

Any way, what is the issue?

You might be wondering, the issue is fixed. But what was the reason I faced this issue? A little explanation needed here.

The VDCAssistant process opens any time an app attempts to use the process. It appears the “camera not found” error message shows up when the VDCAssistant does not properly close when an earlier app used the camera, resulting in the camera staying in use and being blocked by other apps.

Hope this helps!