Python cv2.CAP_PROP_FRAME_WIDTH Examples

def __init__(self, capture=cv2.VideoCapture(0), frame_resize=None):
        self._capture = capture
        self._frame_resize = None
        if frame_resize:
            if isinstance(frame_resize, (tuple, list)) and (len(frame_resize) == 2):
                self._frame_resize = tuple(map(int, frame_resize))
                self._frame_shape = (1, 3, self._frame_resize[0], self._frame_resize[1])
            elif isinstance(frame_resize, float):
                width = int(self._capture.get(cv2.CAP_PROP_FRAME_WIDTH)*frame_resize)
                height = int(self._capture.get(cv2.CAP_PROP_FRAME_HEIGHT)*frame_resize)
                self._frame_shape = (1, 3, width, height)
                self._frame_resize = (width, height)
            else:
                assert False, "frame_resize should be a tuple of (x,y) pixels "
                "or a float setting the scaling factor"
        else:
            self._frame_shape = (1, 3,
                int(self._capture.get(cv2.CAP_PROP_FRAME_WIDTH)),
                int(self._capture.get(cv2.CAP_PROP_FRAME_HEIGHT))) 

def encode(self, video_in, data, video_out):
        assert len(data) == self.data_dim

        video_in = cv2.VideoCapture(video_in)
        width = int(video_in.get(cv2.CAP_PROP_FRAME_WIDTH))
        height = int(video_in.get(cv2.CAP_PROP_FRAME_HEIGHT))
        length = int(video_in.get(cv2.CAP_PROP_FRAME_COUNT))

        data = torch.FloatTensor([data]).cuda()
        video_out = cv2.VideoWriter(
            video_out, cv2.VideoWriter_fourcc(*'mp4v'), 20.0, (width, height))

        for i in tqdm(range(length)):
            ok, frame = video_in.read()
            frame = torch.FloatTensor([frame]) / 127.5 - 1.0      # (L, H, W, 3)
            frame = frame.permute(3, 0, 1, 2).unsqueeze(0).cuda()  # (1, 3, L, H, W)
            wm_frame = self.encoder(frame, data)                       # (1, 3, L, H, W)
            wm_frame = torch.clamp(wm_frame, min=-1.0, max=1.0)
            wm_frame = (
                (wm_frame[0, :, 0, :, :].permute(1, 2, 0) + 1.0) * 127.5
            ).detach().cpu().numpy().astype("uint8")
            video_out.write(wm_frame)

        video_out.release() 

def main():
    device = cv2.CAP_OPENNI
    capture = cv2.VideoCapture(device)
    if not(capture.isOpened()):
        capture.open(device)

    capture.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
    capture.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)

    app = wx.App()
    frame = MyFrame(None, -1, 'chapter2.py', capture)
    frame.Show(True)
#   self.SetTopWindow(frame)
    app.MainLoop()

    # When everything done, release the capture
    capture.release()
    cv2.destroyAllWindows() 

def detect_video(yolo, video_path, output_path=""):
    import cv2
    vid = cv2.VideoCapture(video_path)
    if not vid.isOpened():
        raise IOError("Couldn't open webcam or video")
    video_FourCC    = int(vid.get(cv2.CAP_PROP_FOURCC))
    video_fps       = vid.get(cv2.CAP_PROP_FPS)
    video_size      = (int(vid.get(cv2.CAP_PROP_FRAME_WIDTH)),
                        int(vid.get(cv2.CAP_PROP_FRAME_HEIGHT)))
    isOutput = True if output_path != "" else False
    if isOutput:
        print("!!! TYPE:", type(output_path), type(video_FourCC), type(video_fps), type(video_size))
        out = cv2.VideoWriter(output_path, video_FourCC, video_fps, video_size)
    accum_time = 0
    curr_fps = 0
    fps = "FPS: ??"
    prev_time = timer()
    while True:
        return_value, frame = vid.read()
        image = Image.fromarray(frame)
        image = yolo.detect_image(image)
        result = np.asarray(image)
        curr_time = timer()
        exec_time = curr_time - prev_time
        prev_time = curr_time
        accum_time = accum_time + exec_time
        curr_fps = curr_fps + 1
        if accum_time > 1:
            accum_time = accum_time - 1
            fps = "FPS: " + str(curr_fps)
            curr_fps = 0
        cv2.putText(result, text=fps, org=(3, 15), fontFace=cv2.FONT_HERSHEY_SIMPLEX,
                    fontScale=0.50, color=(255, 0, 0), thickness=2)
        cv2.namedWindow("result", cv2.WINDOW_NORMAL)
        cv2.imshow("result", result)
        if isOutput:
            out.write(result)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    yolo.close_session() 

def _run(self, n_frames=500, width=1280, height=720, with_threading=False):
        if with_threading:
            cap = VideoCaptureTreading(0)
        else:
            cap = cv2.VideoCapture(0)
        cap.set(cv2.CAP_PROP_FRAME_WIDTH, width)
        cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)
        if with_threading:
            cap.start()
        t0 = time.time()
        i = 0
        while i < n_frames:
            _, frame = cap.read()
            cv2.imshow('Frame', frame)
            cv2.waitKey(1) & 0xFF
            i += 1
        print('[i] Frames per second: {:.2f}, with_threading={}'.format(n_frames / (time.time() - t0), with_threading))
        if with_threading:
            cap.stop()
        cv2.destroyAllWindows() 

def getInfo(sourcePath):
    cap = cv2.VideoCapture(sourcePath)
    info = {
        "framecount": cap.get(cv2.CAP_PROP_FRAME_COUNT),
        "fps": cap.get(cv2.CAP_PROP_FPS),
        "width": int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),
        "height": int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)),
        "codec": int(cap.get(cv2.CAP_PROP_FOURCC))
    }
    cap.release()
    return info

#
# Extracts one frame for every second second of video.
# Effectively compresses a video down into much less data.
# 

def __init__(self, video_source, video_width, video_height, video_fps, queue_size=1):
        self.video_fps = video_fps

        vc = cv2.VideoCapture(video_source)

        if hasattr(cv2, 'cv'):
            vc.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, video_width)
            vc.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, video_height)
            vc.set(cv2.cv.CV_CAP_PROP_FPS, video_fps)
        else:
            vc.set(cv2.CAP_PROP_FRAME_WIDTH, video_width)
            vc.set(cv2.CAP_PROP_FRAME_HEIGHT, video_height)
            vc.set(cv2.CAP_PROP_FPS, video_fps)

        self.stream = vc
        self.stopped = False
        self.queue = Queue(maxsize=queue_size)
        self.thread = Thread(target=self.update, args=())
        self.thread.daemon = True
        self.thread.start() 

def __init__(self, capture=cv2.VideoCapture(0), frame_resize=None):
        self._capture = capture
        self._frame_resize = None
        if frame_resize:
            if isinstance(frame_resize, (tuple, list)) and (len(frame_resize) == 2):
                self._frame_resize = tuple(map(int, frame_resize))
                self._frame_shape = (1, 3, self._frame_resize[0], self._frame_resize[1])
            elif isinstance(frame_resize, float):
                width = int(self._capture.get(cv2.CAP_PROP_FRAME_WIDTH)*frame_resize)
                height = int(self._capture.get(cv2.CAP_PROP_FRAME_HEIGHT)*frame_resize)
                self._frame_shape = (1, 3, width, height)
                self._frame_resize = (width, height)
            else:
                assert False, "frame_resize should be a tuple of (x,y) pixels "
                "or a float setting the scaling factor"
        else:
            self._frame_shape = (1, 3,
                int(self._capture.get(cv2.CAP_PROP_FRAME_WIDTH)),
                int(self._capture.get(cv2.CAP_PROP_FRAME_HEIGHT))) 

def __init__(self, device=None, size=None, fps=None, sync=False):
        self.device = device or 0
        self.size = size or (480, 640)
        fps = fps or 30

        self.cap = cv2.VideoCapture(self.device)
        cap_height, cap_width = self.cap.get(cv2.CAP_PROP_FRAME_HEIGHT), self.cap.get(cv2.CAP_PROP_FRAME_WIDTH)
        if cap_height != self.size[0]:
            self.cap.set(cv2.CAP_PROP_FRAME_HEIGHT, self.size[0])
        if cap_width != self.size[1]:
            self.cap.set(cv2.CAP_PROP_FRAME_WIDTH, self.size[1])
        cap_fps = self.cap.get(cv2.CAP_PROP_FPS)
        if cap_fps != fps:
            self.cap.set(cv2.CAP_PROP_FPS, fps)
        if sync:
            raise ValueError("sync not supported") 

def init():
    # initialize VNect estimator
    global estimator
    estimator = VNectEstimator()
    # catch the video stream
    global camera_capture
    camera_capture = cv2.VideoCapture(video)
    assert camera_capture.isOpened(), 'Video stream not opened: %s' % str(video)
    global W_img, H_img
    W_img, H_img = (int(camera_capture.get(cv2.CAP_PROP_FRAME_WIDTH)),
                    int(camera_capture.get(cv2.CAP_PROP_FRAME_HEIGHT)))


################
### Box Loop ###
################
# use a simple HOG method to initialize bounding box 

def source_capture(source):
    source = int(source) if source.isdigit() else source
    cap = cv2.VideoCapture(source)

    fourcc_cap = cv2.VideoWriter_fourcc(*'MJPG')
    cap.set(cv2.CAP_PROP_FOURCC, fourcc_cap)
    cap.set(cv2.CAP_PROP_FRAME_WIDTH, cfg.w)
    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, cfg.h)
    return cap 

def __init__(self, src, width, height):
        # initialize the video camera stream and read the first frame
        # from the stream
        self.frame_counter = 1
        self.width = width
        self.height = height
        self.stream = cv2.VideoCapture(src)
        self.stream.set(cv2.CAP_PROP_FRAME_WIDTH, self.width)
        self.stream.set(cv2.CAP_PROP_FRAME_HEIGHT, self.height)
        (self.grabbed, self.frame) = self.stream.read()
        # initialize the variable used to indicate if the thread should
        # be stopped
        self.stopped = False
        #Debug stream shape
        self.real_width = int(self.stream.get(3))
        self.real_height = int(self.stream.get(4))
        print("> Start video stream with shape: {},{}".format(self.real_width,self.real_height)) 

def __init__(self, src, width, height):
        # initialize the video camera stream and read the first frame
        # from the stream
        self.frame_counter = 1
        self.width = width
        self.height = height
        self.stream = cv2.VideoCapture(src)
        self.stream.set(cv2.CAP_PROP_FRAME_WIDTH, self.width)
        self.stream.set(cv2.CAP_PROP_FRAME_HEIGHT, self.height)
        (self.grabbed, self.frame) = self.stream.read()
        # initialize the variable used to indicate if the thread should
        # be stopped
        self.stopped = False
        #Debug stream shape
        self.real_width = int(self.stream.get(3))
        self.real_height = int(self.stream.get(4))
        print("> Start video stream with shape: {},{}".format(self.real_width,self.real_height)) 

def cam_init(cam_index, width, height): 
    cap = cv2.VideoCapture(cam_index)
    if sys.version_info < (3, 0):
        cap.set(cv2.cv.CV_CAP_PROP_FPS, 30)
        cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH,  width)
        cap.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, height)
    else:
        cap.set(cv2.CAP_PROP_FPS, 30)
        cap.set(cv2.CAP_PROP_FRAME_WIDTH,  width)
        cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)
    return cap 

def __init__(self, src, width, height):
        # initialize the video camera stream and read the first frame
        # from the stream
        self.stream = cv2.VideoCapture(src)
        self.stream.set(cv2.CAP_PROP_FRAME_WIDTH, width)
        self.stream.set(cv2.CAP_PROP_FRAME_HEIGHT, height)
        (self.grabbed, self.frame) = self.stream.read()

        # initialize the variable used to indicate if the thread should
        # be stopped
        self.stopped = False 

def detect_video(yolo, video_path, output_path=""):
    import cv2
    vid = cv2.VideoCapture(video_path)
    if not vid.isOpened():
        raise IOError("Couldn't open webcam or video")
    video_FourCC    = int(vid.get(cv2.CAP_PROP_FOURCC))
    video_fps       = vid.get(cv2.CAP_PROP_FPS)
    video_size      = (int(vid.get(cv2.CAP_PROP_FRAME_WIDTH)),
                        int(vid.get(cv2.CAP_PROP_FRAME_HEIGHT)))
    isOutput = True if output_path != "" else False
    if isOutput:
        print("!!! TYPE:", type(output_path), type(video_FourCC), type(video_fps), type(video_size))
        out = cv2.VideoWriter(output_path, video_FourCC, video_fps, video_size)
    accum_time = 0
    curr_fps = 0
    fps = "FPS: ??"
    prev_time = timer()
    while True:
        return_value, frame = vid.read()
        image = Image.fromarray(frame)
        image = yolo.detect_image(image)
        result = np.asarray(image)
        curr_time = timer()
        exec_time = curr_time - prev_time
        prev_time = curr_time
        accum_time = accum_time + exec_time
        curr_fps = curr_fps + 1
        if accum_time > 1:
            accum_time = accum_time - 1
            fps = "FPS: " + str(curr_fps)
            curr_fps = 0
        cv2.putText(result, text=fps, org=(3, 15), fontFace=cv2.FONT_HERSHEY_SIMPLEX,
                    fontScale=0.50, color=(255, 0, 0), thickness=2)
        cv2.namedWindow("result", cv2.WINDOW_NORMAL)
        cv2.imshow("result", result)
        if isOutput:
            out.write(result)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    yolo.close_session() 

def __init__(self, infile=0, fps=15.0):
        self.cam = cv2.VideoCapture(infile)
        self.cam.set(cv2.CAP_PROP_FPS, fps)
        self.cam.set(cv2.CAP_PROP_FRAME_WIDTH, IMAGE_WIDTH)
        self.cam.set(cv2.CAP_PROP_FRAME_HEIGHT, IMAGE_HEIGHT) 

def decode(self, video_in):
        video_in = cv2.VideoCapture(video_in)
        # width = int(video_in.get(cv2.CAP_PROP_FRAME_WIDTH))
        # height = int(video_in.get(cv2.CAP_PROP_FRAME_HEIGHT))
        length = int(video_in.get(cv2.CAP_PROP_FRAME_COUNT))

        for i in tqdm(range(length)):
            ok, frame = video_in.read()
            frame = torch.FloatTensor([frame]) / 127.5 - 1.0      # (L, H, W, 3)
            frame = frame.permute(3, 0, 1, 2).unsqueeze(0).cuda()  # (1, 3, L, H, W)
            data = self.decoder(frame)[0].detach().cpu().numpy()
            yield data 

def __init__(self, sources='streams.txt', img_size=416, half=False):
        self.mode = 'images'
        self.img_size = img_size
        self.half = half  # half precision fp16 images

        if os.path.isfile(sources):
            with open(sources, 'r') as f:
                sources = [x.strip() for x in f.read().splitlines() if len(x.strip())]
        else:
            sources = [sources]

        n = len(sources)
        self.imgs = [None] * n
        self.sources = sources
        for i, s in enumerate(sources):
            # Start the thread to read frames from the video stream
            print('%g/%g: %s... ' % (i + 1, n, s), end='')
            cap = cv2.VideoCapture(0 if s == '0' else s)
            assert cap.isOpened(), 'Failed to open %s' % s
            w = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
            h = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
            fps = cap.get(cv2.CAP_PROP_FPS) % 100
            _, self.imgs[i] = cap.read()  # guarantee first frame
            thread = Thread(target=self.update, args=([i, cap]), daemon=True)
            print(' success (%gx%g at %.2f FPS).' % (w, h, fps))
            thread.start()
        print('')  # newline 

def __init__(self, src, width, height):
        super(VideoStream, self).__init__()
        # initialize the video camera stream and read the first frame
        # from the stream
        self.frame_counter = 1
        self.width = width
        self.height = height
        self.stream = cv2.VideoCapture(src)
        self.stream.set(cv2.CAP_PROP_FRAME_WIDTH, self.width)
        self.stream.set(cv2.CAP_PROP_FRAME_HEIGHT, self.height)
        (self.grabbed, self.frame) = self.stream.read()
        #Debug stream shape
        self.real_width = int(self.stream.get(3))
        self.real_height = int(self.stream.get(4)) 

def cam_init(cam_index, width, height): 
    cap = cv2.VideoCapture(cam_index)
    if sys.version_info < (3, 0):
        cap.set(cv2.cv.CV_CAP_PROP_FPS, 30)
        cap.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH,  width)
        cap.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, height)
    else:
        cap.set(cv2.CAP_PROP_FPS, 30)
        cap.set(cv2.CAP_PROP_FRAME_WIDTH,  width)
        cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)
    return cap 

def set_video(inp, video_name):
    cap = cv2.VideoCapture(inp)
    fps = int(cap.get(cv2.CAP_PROP_FPS))
    video_width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    video_height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
    size = (video_width, video_height)
    fourcc = cv2.VideoWriter_fourcc(*"XVID")
    video = cv2.VideoWriter(video_name, fourcc, fps, size)
    return cap, video, fps 

def init_camera(camera_width, camera_height):
    if hasattr(cv2, 'cv'):
        vc = cv2.VideoCapture(0)
        vc.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, camera_width)
        vc.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, camera_height)
        vc.set(cv2.cv.CV_CAP_PROP_FPS, 60)
    else:
        vc = cv2.VideoCapture(0)
        vc.set(cv2.CAP_PROP_FRAME_WIDTH, camera_width)
        vc.set(cv2.CAP_PROP_FRAME_HEIGHT, camera_height)
        vc.set(cv2.CAP_PROP_FPS, 60)

    return vc 

def detect_video(yolo, video_path, output_path=""):
    import cv2
    vid = cv2.VideoCapture(0)

    if not vid.isOpened():
        raise IOError("Couldn't open webcam or video")
    video_FourCC    = int(vid.get(cv2.CAP_PROP_FOURCC))
    video_fps       = vid.get(cv2.CAP_PROP_FPS)
    video_size      = (int(vid.get(cv2.CAP_PROP_FRAME_WIDTH)),
                        int(vid.get(cv2.CAP_PROP_FRAME_HEIGHT)))
    isOutput = True if output_path != "" else False
    if isOutput:
        print("!!! TYPE:", type(output_path), type(video_FourCC), type(video_fps), type(video_size))
        out = cv2.VideoWriter(output_path, video_FourCC, video_fps, video_size)
    accum_time = 0
    curr_fps = 0
    fps = "FPS: ??"
    prev_time = timer()
    while True:
        return_value, frame = vid.read()
        image = Image.fromarray(frame)
        image = yolo.detect_image(image)
        result = np.asarray(image)
        curr_time = timer()
        exec_time = curr_time - prev_time
        prev_time = curr_time
        accum_time = accum_time + exec_time
        curr_fps = curr_fps + 1
        if accum_time > 1:
            accum_time = accum_time - 1
            fps = "FPS: " + str(curr_fps)
            curr_fps = 0
        cv2.putText(result, text=fps, org=(3, 15), fontFace=cv2.FONT_HERSHEY_SIMPLEX,
                    fontScale=0.50, color=(255, 0, 0), thickness=2)
        cv2.namedWindow("result", cv2.WINDOW_NORMAL)
        cv2.imshow("result", result)
        if isOutput:
            out.write(result)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    yolo.close_session() 

def __init__(self, src=0, width=None, height=None):
        # initialize the video camera stream and read the first frame
        # from the stream
        self.stream = cv2.VideoCapture(src)

        if width is not None and height is not None: # Both are needed to change default dims
            self.stream.set(cv2.CAP_PROP_FRAME_WIDTH, width)
            self.stream.set(cv2.CAP_PROP_FRAME_HEIGHT, height)

        (self.ret, self.frame) = self.stream.read()

        # initialize the variable used to indicate if the thread should
        # be stopped
        self.stopped = False 

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--output', '-o', type=str, default='videos')
    parser.add_argument('--cap-size', type=int, nargs=2, default=(640, 480))
    args = parser.parse_args()

    cap = cv2.VideoCapture(0)
    width, height = args.cap_size
    cap.set(cv2.CAP_PROP_FRAME_WIDTH, width)
    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)

    output_dir = pathlib.Path(args.output)
    output_dir.mkdir(exist_ok=True, parents=True)
    output_path = output_dir / f'{create_timestamp()}.mp4'
    writer = cv2.VideoWriter(output_path.as_posix(),
                             cv2.VideoWriter_fourcc(*'H264'), 30,
                             (width, height))

    while True:
        key = cv2.waitKey(1) & 0xff
        if key in QUIT_KEYS:
            break

        ok, frame = cap.read()
        if not ok:
            break

        writer.write(frame)
        cv2.imshow('frame', frame[:, ::-1])

    cap.release()
    writer.release() 

def _create_capture(self) -> cv2.VideoCapture:
        if self.config.demo.use_camera:
            cap = cv2.VideoCapture(0)
        elif self.config.demo.video_path:
            cap = cv2.VideoCapture(self.config.demo.video_path)
        else:
            raise ValueError
        cap.set(cv2.CAP_PROP_FRAME_WIDTH, self.gaze_estimator.camera.width)
        cap.set(cv2.CAP_PROP_FRAME_HEIGHT, self.gaze_estimator.camera.height)
        return cap 

def create_capture(args):
    cap = cv.VideoCapture(args.source)
    cap.set(cv.CAP_PROP_FRAME_WIDTH, args.w)
    cap.set(cv.CAP_PROP_FRAME_HEIGHT, args.h)
    if cap is None or not cap.isOpened():
        print('Warning: unable to open video source: ', args.source)
    else:
        print('created capture')
    return cap 

def main(opt):
    cap = cv2.VideoCapture(opt.input)
    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
    if opt.fps == 0:
        fps = int(cap.get(cv2.CAP_PROP_FPS))
    else:
        fps = opt.fps
    out = cv2.VideoWriter(opt.output, cv2.VideoWriter_fourcc(*"XVID"), fps, (width, height))
    images, avg_colors = get_component_images(opt.pool, opt.stride)

    while cap.isOpened():
        flag, frame = cap.read()
        if not flag:
            break
        blank_image = np.zeros((height, width, 3), np.uint8)
        for i, j in product(range(int(width / opt.stride)), range(int(height / opt.stride))):
            partial_input_image = frame[j * opt.stride: (j + 1) * opt.stride,
                                  i * opt.stride: (i + 1) * opt.stride, :]
            partial_avg_color = np.sum(np.sum(partial_input_image, axis=0), axis=0) / (opt.stride ** 2)
            distance_matrix = np.linalg.norm(partial_avg_color - avg_colors, axis=1)
            idx = np.argmin(distance_matrix)
            blank_image[j * opt.stride: (j + 1) * opt.stride, i * opt.stride: (i + 1) * opt.stride, :] = images[idx]
        if opt.overlay_ratio:
            overlay = cv2.resize(frame, (int(width * opt.overlay_ratio), int(height * opt.overlay_ratio)))
            blank_image[height-int(height*opt.overlay_ratio):, width-int(width*opt.overlay_ratio):,:] = overlay
        out.write(blank_image)
    cap.release()
    out.release() 

def run(self):
        """Opening the video IO in the child process and invoke parent 'run' """
        self._cap = cv.VideoCapture(self._device_id)

        if not self._cap.isOpened():
            raise IOError("Unable to open camera on device id {}".format(self._device_id))

        self._cap.set(cv.CAP_PROP_FRAME_WIDTH, self._res[0])
        self._cap.set(cv.CAP_PROP_FRAME_HEIGHT, self._res[1])

        # main process loop
        super(CameraCommunicator, self).run()

        # try to close the IO when the process end
        self._cap.release()