Thread by @securelyfitz

Remember the auto-play sponsor video loop @BSidesPDX? Here's how, finally documented:
Get a raspberry pi with a standard image. Then:
sudo raspi-config # initial setup, set rpi to boot-to-console
sudo apt install omxplayer
echo 'omxplayer --loop video-to-loop.mp4' >> .bashrc

Get a 2-port auto HDMI switch:
- plug RPi into input 1
- plug presenter's cable into input 2
- plug output to the projector
- many projectors have a usb port that can power the RPi

The RPi will auto-boot to a console, then run omxplayer in a seamless loop when .bashrc is done.
The switch will show the RPi, until the presenter plugs in, when it switches to the presenter's screen.
When the presenter unplugs, the switch automatically switches back to the RPi.

Notes:
- Make sure hdmi is plugged in before rpi power or it might not output
- omxplayer uses the rpi video hardware, runs without a desktop environment, and loops seamlessly.
- I got the idea from @vyrus001 who had this setup for @HushCon training a few years ago.