OBS Virtual Cam and Zoom

[Thomas Gunther Music]

When I choose OBS as the virtual camera input for zoom, the video preview in the preferences looks great, but what gets outputted is extremely low quality. So bad, that it can not be used for professional application. I am running it on an iMac with Big Sur installed.

I am convinced it is a bug, but don't know which app causes the problem, OBS or ZOOM.

Any suggestions?