Resize .ogv (ogg theora)

#!/usr/bin/python
#Filename = ogg_resize.py

import os,sys

print '\n\tResize ogg theora video\n'
ogg = raw_input('Enter the ogg file to convert: ')
convert = raw_input('Enter the resized ogg to be created: ')
os.system("ffmpeg2theora %s -x 800 -y 600 -o %s" % (ogg, convert))

if os.path.exists(convert):
print '\n\tYour video', convert, 'has beem resized.\n'
sys.exit()

else:
print 'error, something went wrong!'
sys.exit()