I tested hkcam on iMac (late 2015) and MacBook Pro (mid 2015).
Camera starts and connects reliably and repeatedly on MacBook, although with error "Selected pixel format (yuv420p) is not supported by the input device.
On iMac, erratic behaviour, hkcam sometimes visible and connectable in Home app, sometimes not. Going to the camera in Home gives "no response" and error on console "Selected framerate (30.000000) is not supported by the device".
Image from Macbook camera does not stream, updates every 10 seconds, although Terminal window says "fps=30". Is that normal?
I tested hkcam on iMac (late 2015) and MacBook Pro (mid 2015).
Any ideas? Regards, André Hartman, Belgium
iMac hkcam terminal output.pdf