Copy file ffmpeg

#!/usr/bin/python
import sys, os, subprocess, shlex, re, json, requests
from subprocess import call

# FFprobe function
def FFprobe(filename):
    cmnd = ['ffprobe', '-show_streams', '-print_format', 'json', filename]
    p = subprocess.Popen(cmnd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err =  p.communicate()
    return out

# Check arguments
if len(sys.argv) != 3:
    print "Invalid arguments. Give 2 inputs"
    print "  Format: python create_bumper.py <input> <output>"
    quit()

# Defining variables
inputFile = sys.argv[1]
outputFile = sys.argv[2]

# Probing
probe= FFprobe(inputFile)

# Parsing JSON
json = json.loads(probe)

# Looping each stream
for stream in json["streams"]:
    if stream["codec_type"] == "video":
        videoIndex = stream["index"]
    elif stream["codec_type"] == "audio":
        audioIndex = stream["index"]

video = json["streams"][videoIndex]
audio = json["streams"][audioIndex]

# Creating arguments for ffmpeg
executable = ['ffmpeg', '-hide_banner', '-y', '-v', 'error', '-i', inputFile]
videoCommands = ['-c:v', 'libx264', '-profile:v', video["profile"], '-level', str(video["level"]), '-pix_fmt', video["pix_fmt"], '-filter_complex', 'scale='+str(video["width"])+':'+str(video["height"]), '-bf', '0' ]
audioCommands = ['-c:a', 'aac', '-ar', audio["sample_rate"]]
outputCommands = [ outputFile ]
cmnd = executable + videoCommands + audioCommands + outputCommands

# Running ffmpeg with the gathererd data
p = subprocess.Popen(cmnd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err =  p.communicate()

if err:
    print err
    print cmnd
else:
    print " >> Converted succesfully!"