#!/usr/bin/env python

from __future__ import print_function
import cv2, os, sys, time
from argparse import ArgumentParser


p = ArgumentParser("")
p.add_argument("--video", type=int, default=0, help="video, default: 0")
p.add_argument("--output", default=None, help="path to save movie, default: None (show live)")
p.add_argument("--width", type=int, default=640, help="pre-detect resize width")
p.add_argument("--height", type=int, default=480, help="pre-detect resize height")
p.add_argument("--fourcc", default="XVID", help="MJPG,mp4v,XVID")
p.add_argument("--framerate", type=float, default=25, help="output frame rate")
p.add_argument("--show", default=False, action="store_true")
p.add_argument("--time", type=float, default=None)
args = p.parse_args()

fourcc = None
cam = cv2.VideoCapture(args.video)
cam.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, args.width)
cam.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, args.height)

if args.output:
    try:
        fourcc = cv2.cv.CV_FOURCC(*args.fourcc)
    except AttributeError:
        fourcc = cv2.VideoWriter_fourcc(*args.fourcc)
    out = cv2.VideoWriter()
    out.open(args.output, fourcc, args.framerate, (args.width, args.height))
else:
    out = None

count=0
try:
    if args.time != None:
        start = time.time()
    while True:
        ret, frame = cam.read()
        if out != None:
            out.write(frame)
            count += 1
        if args.show:
            cv2.imshow('display', frame)
            if cv2.waitKey(5) & 0xFF == ord('q'):
                break
        if args.time != None:
            elapsed = time.time() - start
            if (elapsed >= args.time):
                break

except KeyboardInterrupt:
    pass

print ("\nCleaning up... Wrote", count, "frames")
if out:
    out.release()
if args.show:
    cv2.destroyAllWindows()