My current setup is wonderful and simple (Hyperion on RPi zero + usb hdmi capture + WS2812B). The issue is when the HDMI source turns off, the LED lights revert to an unexpected color combination. I am assuming these are coming from the actual LED strip and not Hyperion. Look like Hyperion looses control of the LEDs when the signal is lost. Is there a way in Hyperion to turn off the LEDs when the USB capture signal is lost? or even a specific effect.