[OpenCV common functions: video capture function] cv2.VideoCapture

1、cv2.VideoCapture()

• Enter the video path and create a VideoCapture object

cv2.VideoCapture(filename)
filename: 视频文件的路径+视频名+扩展名

• The functions of this class are:

1) video.isOpened: Check whether the video capture is successful
2) video.read(): Read the video frame, return ret, frame, ret is a bool type, indicating whether it is successful
3) video.release(): Close the video
4) video .get(prop): Get the properties of video

• If you want to read each frame of the video and then perform related processing, you can achieve it through the following code:

video = cv2.VideoCapture(video_path)
while video.isOpened():
	ret, frmae = video.read()
	if ret:
		# 对每一帧进行处理
	else:
		video.release()