Gifify: quick python script to turn movies into gifs with ffmpeg

gifify.py

#!/usr/bin/env python

"""Use ffmpeg to turn a movie into a .gif."""

import os
import argparse
import subprocess

def parse_args():
    """ parse arguments out of sys.argv """
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.ArgumentDefaultsHelpFormatter
    )
    parser.add_argument(
        '-d',
        '--dryrun',
        action="store_true",
        default=False,
        help="Print out command instead of running it."
    )

    parser.add_argument(
        "input_movie",
        type=str,
        help="Movie file that ffmpeg can read to turn into a .gif file."
    )

    parser.add_argument(
        "-m",
        "--multiple",
        type=int,
        default=4,
        help="Scale multiplier (-m 4 means 1/4 the size)."
    )

    parser.add_argument(
        "-r",
        "--rate",
        type=int,
        default=10,
        help="Output framerate."
    )

    parser.add_argument(
        '-p',
        '--pix_fmt',
        type=str,
        default="rgb24",
        help="pixel format."
    )

    return parser.parse_args()

FFMPEG = (
    'ffmpeg -i {input_movie} -vf "scale=iw/{multiplier}:ih/{multiplier}" '
    '-pix_fmt {pix_fmt} -r {rate} -f gif {basename}.gif'
)

def main():
    """main function for module"""
    args = parse_args()

    basename = os.path.splitext(args.input_movie)[0]

    cmd = FFMPEG.format(
        input_movie = args.input_movie,
        multiplier = args.multiple,
        rate = args.rate,
        pix_fmt = args.pix_fmt,
        basename = basename
    )

    if args.dryrun:
        cmd = '[DRYRUN] ' + cmd
    print(cmd)
    if args.dryrun:
        return

    returncode = subprocess.call(cmd, shell=True)
    if returncode:
        raise RuntimeError(
            "ffmpeg returned non-zero error code: {0}".format(returncode)
        )


if __name__ == '__main__':
    main()

Fixed some typos.