def main(argv):
if len(argv) != 2:
print 'Input child dir for tmp files (must already exist): '
dest_dir = sys.stdin.readline().strip()
dest_dir = argv[1]
q = OCR_Queue()
#Have a linear backoff but exponential turn-on
#for queue handling
e_delay = 0.1
while True:
#print ' > waiting to process a frame'
succ = q.dequeue_frame(dest_dir)
if succ:
print ' > success!'
if e_delay > 0.001:
e_delay = e_delay / 2.0
else:
#print ' > queue empty! backing off for ',
print str(e_delay) + ' seconds'
time.sleep(e_delay)
if e_delay < 60.0:
e_delay = e_delay + 0.1