If you want to run the script on boot, you should use start.sh. start.sh runs the usb-update script, and then starts playing video.mp4 on a loop. It uses omxplayer (make sure whatever version you use has the --loop option). I would suggest simply adding the following to /etc/init.d/rc.local:
```
+cd /home/pi/hdmi-switcher
/home/pi/hdmi-switcher/start.sh
```
openssl dgst -sha256 -verify public.pem -signature /mnt/usb-update/update.sig /mnt/usb-update/update.zip > /dev/null 2>&1
if [[ $? = 0 ]]; then
(unzip -o /mnt/usb-update/update.zip -d /home/pi > /dev/null 2>&1 && printf "\tOK\n") || printf "\tExtract failure\n"
+ chmod +x start.sh
+ chmod +x update.sh
else
printf "\tSignature failure\n"
fi