【Python】【OpenCV】视频流操作 and 窗口显示图像和视频

 1 import cv2
 2 
 3 # 创建一个视屏捕获对象
 4 videoCapture = cv2.VideoCapture('AVI.avi')
 5 
 6 # 获取视频的属性值，cv2.CAP_PROP_FPS获取视频帧率
 7 fps = videoCapture.get(cv2.CAP_PROP_FPS)
 8 
 9 # cv2.CAP_PROP_FRAME_WIDTH/HEIGHT 返回float类型 获取视频帧的宽高
10 size = int(videoCapture.get(cv2.CAP_PROP_FRAME_WIDTH)), \
11        int(videoCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))
12 
13 '''
14 创建一个写入对象，将帧写入输出的视频
15 cv2.VideoWriter_fourcc()函数指定编码器为 I420
16 fps 和 size 指定输出的帧率和尺寸
17 '''
18 videoWrite = cv2.VideoWriter('Out.avi',
19                              cv2.VideoWriter_fourcc('I', '4', '2', '0'),
20                              fps, size
21                              )
22 
23 '''
24 对捕获到的视频对象进行读取帧，success表示是否成功读取一帧，frame表示当前帧。
25 循环读取写入输出视频。
26 '''
27 success, frame = videoCapture.read()
28 while success:
29        videoWrite.write(frame)
30        success, frame = videoCapture.read()

 1 import cv2
 2 
 3 cameraCapture = cv2.VideoCapture(0)
 4 
 5 fps = 30
 6 
 7 size = int(cameraCapture.get(cv2.CAP_PROP_FRAME_WIDTH)), \
 8         int(cameraCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))
 9 
10 videoWriter = cv2.VideoWriter(
11     'OutVideo_GRAB.avi',
12     cv2.VideoWriter_fourcc('I', '4', '2', '0'),
13     fps,
14     size
15 )
16 
17 success, frame = cameraCapture.read()
18 
19 numFramesRemaining = 10 * fps
20 while success and numFramesRemaining > 0:
21     videoWriter.write(frame)
22     success, frame = cameraCapture.read()
23     numFramesRemaining -= 1