Stopping the Video Recording Issue

screen-recorder.py

#!/usr/bin/env python3
import sys
import os
import subprocess
from PyQt5 import QtCore, QtGui, QtWidgets
from pynput.keyboard import Key, Controller
from ffmpeg import Ui_frmMain

class ffmpeg(Ui_frmMain):
	def __init__(self, dialog):
		Ui_frmMain.__init__(self)
		self.setupUi(dialog)
		
		self.pbRecord.clicked.connect(self.filename)
		keyboard = Controller() #Problem here
		pressQ = keyboard.press('q') #Problem here
		self.pbQuit.clicked.connect(pressQ) #Problem here
	
	def filename(self):
		vidname = os.environ['HOME'] + "/Videos/" + self.txtFile.text() + ".mkv" #sets the directory to save image in
		cmd = subprocess.run(["/usr/bin/ffmpeg", "-video_size", "1920x1080", "-framerate", "20", "-f", "x11grab", "-i", ":0.0", "-f", "pulse", "-ac", "2", "-i", "default", vidname])
		
 
if __name__ == '__main__':
	app = QtWidgets.QApplication(sys.argv)
	dialog = QtWidgets.QMainWindow()
 
	prog = ffmpeg(dialog)
 
	dialog.show()
	sys.exit(app.exec_())

Gives me the following error.

qTraceback (most recent call last):
File "screen-recorder.py", line 28, in
prog = ffmpeg(dialog)
File "screen-recorder.py", line 17, in init
self.pbQuit.clicked.connect(pressQ)
TypeError: argument 1 has unexpected type 'NoneType'

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NOTE: It simulates the q key being pressed after the error.