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The content of this article mainly focuses on how to solve the problem of OpenCV reading video error report. The content of the article is clear and clear. It is very suitable for beginners to learn and is worth reading. Interested friends can follow the editor to read together. I hope you can get something through this article!

Recently, due to the needs of the project, I often need to use opencv to read video. I often encounter a problem, that is, there will be an error after reading the video. Although it does not affect the result of the code, I really can't stand nitpicking.

Procedures that will report errors:

#-*-coding:utf-8-*- "" File Name: read_video.pyProgram IDE: PyCharmCreate File By Author: Hong "" import cv2def read_video (video_path: str): "OpenCV Video Reading Gadget Solve the problem of error reporting after video reading: param video_path: enter the video file path to be read: return: no return value "" print ('video path:', video_path) cap = cv2.VideoCapture (video_path) while cap.isOpened (): # get a frame ret, frame = cap.read () cv2.imshow ("capture") Frame) if cv2.waitKey (1) & 0xFF = = ord ('q'): break print ('finish the video!') Cap.release () cv2.destroyAllWindows () if _ _ name__ ='_ _ main__': path = rudder:\ multi_insect_videos\ multi_object00.mp4' read_video (path)

You can read the video normally, but the result will output an error.

Traceback (most recent call last): File "E:/PyCharmDocument/create_ST_image/multi_insect_processing/crop_video_to_images.py", line 76, in read_video (path) File "E:/PyCharmDocument/create_ST_image/multi_insect_processing/crop_video_to_images.py", line 65, in read_video cv2.imshow ("capture") Frame) cv2.error: OpenCV (4.5.3) C:\ Users\ runneradmin\ AppData\ Local\ Temp\ pip-req-build-uzca7qz1\ opencv\ modules\ imgproc\ src\ color.cpp:182: error: (- 215:Assertion failed)! _ src.empty () in function 'cv::cvtColor'

The reason is that when the video ends, the imshow () function of opencv fails to read the frame. Solution: add judgment before imshow (), read it only when there is a frame, and exit the loop directly when there is no frame.

Code that will not report an error:

#-*-coding:utf-8-*- "" File Name: read_video.pyProgram IDE: PyCharmCreate File By Author: Hong "" import cv2def read_video (video_path: str): "OpenCV Video Reading Gadget Solve the problem of error reporting after video reading: param video_path: enter the video file path to be read: return: no return value "" print ('video path:', video_path) cap = cv2.VideoCapture (video_path) while cap.isOpened (): # get a frame ret, frame = cap.read () if not ret: break cv2.imshow ("capture") Frame) if cv2.waitKey (1) & 0xFF = = ord ('q'): break print ('finish the video!') Cap.release () cv2.destroyAllWindows () if _ _ name__ ='_ _ main__': path = rudder:\ multi_insect_videos\ multi_object00.mp4' read_video (path)

The output result of the program:

Video path: d:\ multi_insect_videos\ multi_object00.mp4 finish the video! Process finished with exit code 0 Thank you for your reading, I believe you have a certain understanding of the problem of "how to solve the problem of OpenCV reading video error report". Go to practice quickly, if you want to know more related knowledge points, you can follow the website! The editor will continue to bring you better articles!

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