'-J', '--dump-single-json',
action='store_true', dest='dump_single_json', default=False,
help='simulate, quiet but print JSON information for each command-line argument. If the URL refers to a playlist, dump the whole playlist information in a single line.')
'-J', '--dump-single-json',
action='store_true', dest='dump_single_json', default=False,
help='simulate, quiet but print JSON information for each command-line argument. If the URL refers to a playlist, dump the whole playlist information in a single line.')