help='video format code, specifiy the order of preference using slashes: "-f 22/17/18". "-f mp4" and "-f flv" are also supported')
video_format.add_option('--all-formats',
action='store_const', dest='format', help='download all available video formats', const='all')
help='video format code, specifiy the order of preference using slashes: "-f 22/17/18". "-f mp4" and "-f flv" are also supported')
video_format.add_option('--all-formats',
action='store_const', dest='format', help='download all available video formats', const='all')