import RPi.GPIO as GPIO
from time import sleep
import os
from subprocess import check_output

GPIO.setmode(GPIO.BCM)
GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_UP)
status = 0

while True:
    input_state = GPIO.input(21)
        if input_state == False:
            if status == 0:
            print('AV')
            status = 1
            #Switch to AV
            os.system("sudo killall emulationstation; tvservice -c \"PAL 4:3\"; fbset -depth 8; fbset -depth 16; emulationstation")
        else:
            print('HDMI')
            status = 0
            #Switch to HDMI
            os.system("sudo killall emulationstation; tvservice -p; fbset -depth 8; fbset -depth 16; emulationstation")
        time.sleep(0.2)