Wrote this a couple posts back before it got buried.
You need to update OBS to 26.1.1 by adapting the PKGBUILD.
For some reason the Arch repo version is still stuck at 26.1.0 containing a bug for Intensity cards (I had the all green thing as well).
Pinned Comments
goldensuneur commented on 2020-03-02 19:00 (UTC)
I finally had time to investigate the issue. It looks like that as of 11.5, the
DesktopVideoHelper.service
has to be running for the capture card to work properly.