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Fix FreeBSD OBS Window Capture Not Working
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Run OBS from terminal (not gui) and look for errors.

  libEGL warning: failed to open /dev/dri/card0: Permission denied
  libEGL warning: DRI2: could not open /dev/dri/card0 (Permission denied)
  error: VAAPI: Failed to open device '/dev/dri/renderD128'
  error: VAAPI: Failed to open device '/dev/dri/renderD128'

https://docs.freebsd.org/en/books/handbook/x11/#x-install


Add yourself to the video group!

root@host:~ # pw groupmod video -m username

logout, login, launch obs.