问题描述
我正在尝试从 IP 摄像机获取 Python 中的视频流,但出现错误.我正在使用 Pycharm IDE.
I am trying to get video stream in python from IP camera but i am getting an error. I am Using Pycharm IDE.
import cv2 scheme = '192.168.100.23' host = scheme cap = cv2.VideoCapture('http://*****:Ebmacs8485867@'+host+':81/web/*****.html') while True: ret, frame = cap.read() # Place options to overlay on the video here. # I'll go over that later. cv2.imshow('Camera', frame) k = cv2.waitKey(0) & 0xFF if k == 27: # esc key ends process cap.release() break cv2.destroyAllWindows()
Error: "E:Digital Image ProcessingpythonReadingAndDisplayingImagesvenvScriptspython.exe" "E:/Digital Image Processing/python/ReadingAndDisplayingImages/ReadandDisplay.py" Traceback (most recent call last): File "E:/Digital Image Processing/python/ReadingAndDisplayingImages/ReadandDisplay.py", line 14, in <module> cv2.imshow('Camera', frame) cv2.error: OpenCV(4.0.1) C:projectsopencv-pythonopencvmoduleshighguisrcwindow.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:901) warning: http://*****:Ebmacs8485867@192.168.100.23:81/web/*****.html (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:902)
推荐答案
由于流链接无效,您很可能会收到该错误.将您的流链接插入 VLC 播放器以确认它正在工作.这是一个使用 OpenCV 和 cv2.VideoCapture.read() 的 IP 摄像机视频流小部件.由于 read() 是一个阻塞操作,因此此实现使用线程来获取不同线程中的帧.通过将此操作放在仅专注于获取帧的单独操作中,它可以通过减少 I/O 延迟来提高性能.我使用了自己的 IP 摄像机 RTSP 流链接.将 stream_link 更改为您自己的 IP 摄像头链接.
You're most likely getting that error due to an invalid stream link. Insert your stream link into VLC player to confirm it is working. Here's a IP camera video streaming widget using OpenCV and cv2.VideoCapture.read(). This implementation uses threading for obtaining frames in a different thread since read() is a blocking operation. By putting this operation into a separate that that just focuses on obtaining frames, it improves performance by I/O latency reduction. I used my own IP camera RTSP stream link. Change stream_link to your own IP camera link.
根据您的 IP 摄像机,您的 RTSP 流链接会有所不同,这是我的一个示例:
Depending on your IP camera, your RTSP stream link will vary, here's an example of mine:
rtsp://username:password@192.168.1.49:554/cam/realmonitor?channel=1&subtype=0 rtsp://username:password@192.168.1.45/axis-media/media.amp
代码
from threading import Thread import cv2 class VideoStreamWidget(object): def __init__(self, src=0): # Create a VideoCapture object self.capture = cv2.VideoCapture(src) # Start the thread to read frames from the video stream self.thread = Thread(target=self.update, args=()) self.thread.daemon = True self.thread.start() def update(self): # Read the next frame from the stream in a different thread while True: if self.capture.isOpened(): (self.status, self.frame) = self.capture.read() def show_frame(self): # Display frames in main program if self.status: self.frame = self.maintain_aspect_ratio_resize(self.frame, width=600) cv2.imshow('IP Camera Video Streaming', self.frame) # Press Q on keyboard to stop recording key = cv2.waitKey(1) if key == ord('q'): self.capture.release() cv2.destroyAllWindows() exit(1) # Resizes a image and maintains aspect ratio def maintain_aspect_ratio_resize(self, image, width=None, height=None, inter=cv2.INTER_AREA): # Grab the image size and initialize dimensions dim = None (h, w) = image.shape[:2] # Return original image if no need to resize if width is None and height is None: return image # We are resizing height if width is none if width is None: # Calculate the ratio of the height and construct the dimensions r = height / float(h) dim = (int(w * r), height) # We are resizing width if height is none else: # Calculate the ratio of the 0idth and construct the dimensions r = width / float(w) dim = (width, int(h * r)) # Return the resized image return cv2.resize(image, dim, interpolation=inter) if __name__ == '__main__': stream_link = 'your stream link!' video_stream_widget = VideoStreamWidget(stream_link) while True: try: video_stream_widget.show_frame() except AttributeError: pass