![]() The video (UVC) functionality, however, is a different story. This is presumably because this is central to the operating system, and needs to be made available in the system sound preferences. In all cases, the audio (UAC) functionality is properly enumerated when the device is plugged in. These are both USB composite devices, consisting of USB audio class (microphone, and optionally speaker) and USB video class (camera) components. I have been testing with the device my company is creating, and as a control, an industry-standard UVC-compliant device (Logitech C920) and observed similar results. Often (~25-50% of the time), UVC class-specific enumeration is not completed. I am currently running Sierra 10.12.1 on a Macbook Air 13" mid-2011 edition. I am working on a USB Video Class (UVC) compliant device, and noticed some strange issues with UVC enumeration on Mac OS.
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