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[from: https://rusnak.io/autoplay-video-on-raspberry-pi/]

1. Download Raspbian Lite from raspberrypi.org
2. Copy the downloaded image to the SD card
   1. (e.g. sudo dd if=2020-02-13-raspbian-buster-lite.img of=/dev/mmcblk0 conv=fsync,notrunc bs=4M)
3. Boot Raspberry Pi into freshly installed Raspbian
4. Copy your video from USB flash drive to the SD card
5. sudo apt-get update
6. sudo apt-get install omxplayer
7. Append this line /usr/bin/omxplayer -b –loop /home/pi/*.mp4 to file /etc/rc.local
8. Set the file as executable: chmod +x /etc/rc.local
9. Reboot and enjoy!

To turn it off, I had to ssh into the raspberry pi and remove the added line from /etc/rc.local and reboot.