Generating staff roll movie (images) from vertically long image(s)

staffroll.py

#!/usr/bin/env python
# -*- coding: utf-8 -*

from PIL import Image
import argparse
import os

def make(image_names, target_height, seconds, imgs_per_seconds, outfile_prefix, outdir):
    try:
        if not os.path.exists(outdir):
                os.makedirs(outdir)

        images = [Image.open(image_name) for image_name in image_names]
        width, height = images[0].size
        remain = height - target_height
        step = remain / seconds / imgs_per_seconds

        c = 1
        print "src width: {0}, height: {1}, remain: {2}, step: {3}".format(width, height, remain, step)
        print "target widt: {0}, height: {1}".format(width, target_height)
        for y in range(0, height - target_height, step):
            print "{0}, {1}, {2}, {3}, {4}".format(0, y, width, y + target_height - 1, image_names[c % len(images)])
            img = images[c % len(images)]

            cropped = img.crop((0, y, width, y + target_height - 1))
            cropped.save("{0}/{1}_{2}.jpg".format(outdir, outfile_prefix, c))
            c += 1

    except Exception as e:
        print e

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='generate staff roll movie by cropping vertically long image(s)')
    parser.add_argument('--images', metavar='IMGS', nargs='+', type=str, required=True, help='vertically long image(s)')
    parser.add_argument('--height', metavar='SIZE', type=int, required=True, help='output screen height')
    parser.add_argument('--sec', metavar='SEC', type=int, required=True, help='how long sec output staff roll is')
    parser.add_argument('--images_per_sec', metavar='IMGS_PER_SEC', type=int, default=4, help='how many images shown in a sec')
    parser.add_argument('--outfile_prefix', metavar='OUTFILE_PREFIX', type=str, default="staffroll", help='output file name is "prefix"_00xx.jpg')
    parser.add_argument('--outdir', metavar='OUTPUT_DIRECTORY', type=str, default="staffroll", help='output directory')

    args = parser.parse_args()
    make(args.images, args.height, args.sec, args.image_per_sec, args.outfile_prefix, args.outdir)