After-FOSDEM videobox updates

The FOSDEM video capture box is a custom device for doing all the in-room stuff for the live-streams of the event. It contains a Radxa x4 SBC, a digital audio mixer, an HDMI capture card, some USB chargers and a network switch. Every room that is livestreamed has two of these boxes, one in front that captures the audio and the HDMI signal for the projector. The other box is in the back of the room hooked up to the camera. Wiring diagram for the box internals The network switch is the managed network switch