15-Saving-a-video.ipynb

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   "source": [
    "# <div style=\"direction:rtl;text-align:right;font-family:B Lotus, B Nazanin, Tahoma\">ذخیره ویدیو در OpenCV</div>"
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   "source": [
    "<div style=\"direction:rtl;text-align:right;font-family:Tahoma\">\n",
    "FourCC یک کد 4 بایتی است که برای تعیین کدک ویدیو استفاده می شود. لیست کدهای موجود را می توانید در fourcc.org بیابید.\n",
    "</div>\n",
    "\n",
    "[FourCC](https://en.wikipedia.org/wiki/FourCC)\n",
    "\n",
    "\n",
    "**In Fedora:**\n",
    "\n",
    "    DIVX, XVID, MJPG, X264, WMV1, WMV2. \n",
    "    (XVID is more preferable. MJPG results in high size video. X264 gives very small size video)\n",
    "**In Windows:** \n",
    "\n",
    "    DIVX   \n",
    "**In OSX:**\n",
    "\n",
    "    MJPG (.mp4), DIVX (.avi), X264 (.mkv).\n",
    "\n",
    "\n",
    "We create a VideoWriter object. We should specify the output file name (eg: output.avi). Then we should specify the FourCC code. Then number of frames per second (fps) and frame size should be passed. And the last one is the isColor flag. If it is True, the encoder expect color frame, otherwise it works with grayscale frame."
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   "source": [
    "FourCC code is passed as `cv.VideoWriter_fourcc('M','J','P','G')or cv.VideoWriter_fourcc(*'MJPG')` for MJPG."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<div style=\"direction:rtl;text-align:right;font-family:Tahoma\">\n",
    "ذخیره ویدیوی وبکم در فایل</div>"
   ]
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    "import numpy as np\n",
    "import cv2\n",
    "cap = cv2.VideoCapture(0)\n",
    "\n",
    "# Define the codec and create VideoWriter object\n",
    "fourcc = cv2.VideoWriter_fourcc(*'XVID')\n",
    "out = cv2.VideoWriter('output.avi', fourcc, 20.0, (640,  480))\n",
    "while cap.isOpened():\n",
    "    ret, frame = cap.read()\n",
    "    if not ret:\n",
    "        print(\"Can't receive frame (stream end?). Exiting ...\")\n",
    "        break\n",
    "    frame = cv2.flip(frame, 1)\n",
    "    # write the flipped frame\n",
    "    out.write(frame)\n",
    "    cv2.imshow('frame', frame)\n",
    "    if cv2.waitKey(1) == ord('q'):\n",
    "        break\n",
    "# Release everything if job is finished\n",
    "cap.release()\n",
    "out.release()\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<div style=\"direction:rtl;text-align:right;font-family:Tahoma\">\n",
    "خواندن و ویرایش ویدیو و ذخیره مجدد</div>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Done\n"
     ]
    }
   ],
   "source": [
    "import cv2\n",
    "\n",
    "# Load video clip\n",
    "cap = cv2.VideoCapture('./videos/race_car.mp4')\n",
    "\n",
    "# Get the height and width of the frame (required to be an interger)\n",
    "w = int(cap.get(3)) \n",
    "h = int(cap.get(4))\n",
    "\n",
    "# Define the codec and create VideoWriter object. The output is stored in '*.avi' file.\n",
    "out = cv2.VideoWriter('race_car_gray.avi', cv2.VideoWriter_fourcc('M','J','P','G'), cap.get(cv2.CAP_PROP_FPS), (w, h), False)\n",
    "\n",
    "while True:\n",
    "\n",
    "    ret, frame = cap.read()\n",
    "\n",
    "    if ret == True:\n",
    "        gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)\n",
    "        out.write(gray)\n",
    "    else:\n",
    "        print(\"Done\")\n",
    "        break\n",
    "        \n",
    "cap.release()\n",
    "out.release()\n",
    "cv2.destroyAllWindows()"
   ]
  }
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