Screencasting Script with FFmpeg

#!/usr/bin/python
#/home/clockworkpc/bin/screencast.py

# Released under a GPLv3 Licence by Clockwork PC 2013
# www.clockworkpc.com.au

# You are entitled to the following four freedoms:
# Freedom 0: To run this program for any purpose
# Freedom 1: To study how this program works and change it to make it do what you wish
# Freedom 2: To redistribute copies so you can help your neighbour
# Freedom 3: To distribute copies of your modified version to others

import os, datetime

now = datetime.datetime.now()
nowstring = str(now.strftime("%Y-%m-%d_%A_%H:%M:%S"))

binFolder = os.getenv("HOME") + "/Videos/Desktop_Recording/" + nowstring + "/"
videoStream = binFolder + "desktop_recording_on_" + nowstring + ".mkv"
audioStream = binFolder + "microphone_input_on_" + nowstring + ".mp3"
mergedVideo = binFolder + "screencast_on_" + nowstring + ".mkv"

os.system("mkdir " + binFolder)

os.system("gnome-terminal -x ffmpeg -f x11grab -r 30 -s 1366x768 -i :0.0 -c:v libx264 -threads 0 " + videoStream)

os.system("gnome-terminal -x ffmpeg -f alsa -ac 2 -i pulse " + audioStream)

convertPrompt = input("""Do you want to merge the streams?
1. Yes
2. No

Please enter your choice: """)

if convertPrompt == 1:
    os.system("gnome-terminal -x ffmpeg -i " + videoStream + " -i " + audioStream + " -b 5000k " + mergedVideo)
else:
    exitQuestion = input("Are you done? (Press 1) ")
    if exitQuestion == 1:
        exit()
    else:
        exit()

exitQuestionFinal = input("Are you done? (Press 1) ")
if exitQuestionFinal == 1:
    exit()
else:
    exit()