How can I select 'none' for video source of macOS version?

I can select 'none' for video source in windows version, but not in macOS version.

 

2017-07-05 19.02.47.pngmacOS version always use Blackmagic UltraStudio Mini Recorder as a video source.

And after connecting to this mac, Blackmagic UltraStudio Mini Recorder doesn't work until reboot macOS.

How can I forbid teamviewer try to use this device?