add first version of generator, extracting frames and resizing them

generator

@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+
+"""Video Thumbnail Generator
+
+Usage:
+  ./generator <video> <interval> <width> <height> <columns> <output>
+  ./generator (-h | --help)
+  ./generator --version
+
+Options:
+  -h --help     Show this screen.
+  --version     Show version.
+  <video>         Video filepath.
+  <interval>      Interval em seconds between frames.
+  <width>         Width of each thumbnail.
+  <height>        Height of each thumbnail.
+  <columns>       Total number of thumbnails per line.
+  <output>        Output.
+"""
+
+from docopt import docopt
+from moviepy.editor import VideoFileClip
+from PIL import Image
+import glob, os, random, sys
+
+
+TMP_FRAMES_PATH="/tmp/frames/"
+
+def generate_video_thumbnail(args):
+    videoFileClip = VideoFileClip(args['<video>'])
+    interval = int(args['<interval>'])
+    size = (int(args['<width>']), int(args['<height>']))
+    outputPrefix = get_output_prefix()
+
+    generate_frames(videoFileClip, interval, outputPrefix, size)
+#    generate_sprite_from_images()
+
+def generate_frames(videoFileClip, interval, outputPrefix, size):
+    print "Extracting", int(videoFileClip.duration / interval), "frames (prefix:" + outputPrefix + ")"
+    for i in range(0, int(videoFileClip.duration), interval):
+        extract_frame(videoFileClip, i, outputPrefix, size)
+    print "Frames extracted."
+
+#    framesMap = sorted(glob.glob(outputPrefix + "*.png"))
+#    images = [Image.open(filename) for filename in framesMap]
+
+def extract_frame(videoFileClip, moment, outputPrefix, size):
+    sys.stdout.write(".")
+    sys.stdout.flush()
+    output = outputPrefix + str(moment) + ".png"
+    videoFileClip.save_frame(output, t=int(moment))
+    resize_image(output, size)
+
+def resize_image(filename, size):
+    sys.stdout.write("*")
+    sys.stdout.flush()
+    image = Image.open(filename)
+    image.thumbnail(size, Image.ANTIALIAS)
+    image.save(filename, "PNG")
+
+def get_output_prefix():
+    if not os.path.exists(TMP_FRAMES_PATH):
+        os.makedirs(TMP_FRAMES_PATH)
+    return TMP_FRAMES_PATH + ("%032x_" % random.getrandbits(128))
+
+
+if __name__ == "__main__":
+    arguments = docopt(__doc__, version='Naval Fate 2.0')
+    generate_video_thumbnail(arguments)
+