ffmpeg batch convert script in python

convert_path.py

import os
import sys

path = sys.argv[1]

input_format = ['.' + x for x in sys.argv[2].split()]
output_format = '.' + sys.argv[3]
args = sys.argv[4]

files = [os.path.join(path,f) for f in os.listdir(path) if os.path.splitext(f.lower())[1] in input_format]
print files
print input_format
print output_format
print args
for f in files:
    os.system('ffmpeg %s -i "%s" "%s%s"' % (args, f, f, output_format))