This is a description of a device used to run a projector in a room while also capturing what is shown on the projector for a recording or livestream.

Applications

When running a projector in a room during a conference, it is much nicer for the in-person audience to see something on the screen when the presenter removes their laptop, rather than the generic "no signal" screen from the projector.

Physical Inputs

• HDMI 1 (Presenter Laptop)
• HDMI 2 (Producer)

Outputs

• HDMI 1 (Passthrough)
• HDMI 2 (Switcher)
• HDMI 3 (Projector)

Buttons/Switches

• Capture: Saves a still frame from HDMI 1 into memory
• Fallback Source: Toggles the fallback video source between Input 2 or the still image store
• Input/Fallback/Auto: "Input" selects HDMI 1, "Fallback" selects the Fallback source, "Auto" automatically switches to Input 1 when a signal is detected
• Switcher Source "Input/Fallback": toggles HDMI 2 between the Fallback source or Input 1

Video Sources

• HDMI 1 (Presenter Laptop)
• HDMI 2 (Producer)
• Still image memory

Block Diagram

There are three source selectors on the device.

• Switch 3: selects the fallback source from the still image store or Input 2.
• Switch 2: switches the video sent to the projector and Switch 1 between the fallback source or Input 1.
• Switch 1: switches the video sent to the main streaming video switcher between the projector feed or Input 1.

The three outputs are used for:

• Output 1: A passthrough feed of the presenter's laptop on Input 1. This can feed a confidence monitor so they will always be able to see their screen.
• Output 2: This goes into the main video switcher for recording or streaming.
• Output 3: This feeds the projector in the room.