mov2gif.py

#!/usr/bin/env python
 
'''
DEPENDENCIES:
$ brew install ffmpeg
$ brew install imagemagick
 
$ python ./mov2gif.py input.mov output.gif 15
'''
 
import sys
import os
import tempfile
import shutil
import subprocess
 
if len(sys.argv) <= 2:
	print 'usage: ', sys.argv[0], '[INPUT_MOV_FILENAME]', '[OUTPUT_GIF_FILENAME]', '[FPS]'
	sys.exit(-1)
 
assert(os.path.exists(sys.argv[1]))
INPUT_MOV_FILENAME = sys.argv[1]
 
OUTPUT_GIF_FILENAME = sys.argv[2]
 
try:
	FPS = int(sys.argv[3])
except Exception, e:
	FPS = 10
 
temp = tempfile.mkdtemp()
 
cmd = 'ffmpeg -loglevel quiet -i %(INPUT_MOV_FILENAME)s -r %(FPS)i %(TEMP)s' % {
	"INPUT_MOV_FILENAME": INPUT_MOV_FILENAME,
	"FPS": FPS,
	"TEMP": os.path.join(temp, '%5d.png')
}
subprocess.check_call(cmd, shell=True)
 
cmd = 'convert -delay 1x%(FPS)i %(TEMP)s %(OUTPUT_GIF_FILENAME)s' % {
	"FPS": FPS,
	"TEMP": os.path.join(temp, '*.png'),
	'OUTPUT_GIF_FILENAME': OUTPUT_GIF_FILENAME
}
subprocess.check_call(cmd, shell=True)
 
shutil.rmtree(temp)
 
cmd = 'open -R %(OUTPUT_GIF_FILENAME)s' % {
	"OUTPUT_GIF_FILENAME": OUTPUT_GIF_FILENAME
}
subprocess.check_call(cmd, shell=True)
 
print 'done'

Here's a version which supports file name with spaces:
https://gist.github.com/danvk/ea7a9e2cd8cde9c92a5e