A basic implementation of a (test) pattern generator from the HDMI output of an raspberry pi. The main reason is for our livestreaming purposes (http://koekfm.nl) so we can generate a test card for the switcher (Roland v-1HD) without hooking up a full blown computer just to generate it. (Yes, I could have bought an ATEM switch...)

Settled w/ fbi inspired from various sources around the net

• Create an image w/ Debian lite

• Set the bootoption and other settings w/ sudo raspi-config

  - 3 Boot options
    - B1 Desktop / CLI
      - B2 Console Autologin
    - B2 Wait for Network at Boot -> no
  - 5 Interfacing Options
    - P2 enable SSH (optional)
  - 7 Advanced Options
    - A2 Overscan -> no
  

• Install FBI

  sudo apt-get -y update
  sudo apt-get -y install fbi
  

• Copy the png and script to the homedir (/home/pi)

  curl https://raw.githubusercontent.com/LeipeLeon/PiPatternGenerator/master/2160-4k-koekfm.png > 2160-4k-koekfm.png
  curl https://raw.githubusercontent.com/LeipeLeon/PiPatternGenerator/master/start-display.sh > start-display.sh
  

• Change the umask of file

  chmod +x start-display.sh
  

• Add this script to the .bashrc

  echo "/home/pi/start-display.sh" >> .bashrc
  

• Reboot

  sudo reboot
  

Voila!

Generate a testcard with https://pixelcubes.art/testcard.html