The problem is, that the picture is coming from the HDMI2AV converter and not from the grabber. So the HDMI2AV converter is sending a rainbow or...
A picture of that and some more information is found here: https://github.com/hyperion-project/hyperion/issues/92
Seems like someone actually already implemented something: https://github.com/danimal4326/homebridge-hyperion I will further investigate.
I don't really know where to put this, as it will most likely be a standalone addon that should not be part of hyperion. Has anyone ever tried to...
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