python opencv3 获取摄像头视频
git：https://github.com/linyi0604/Computer-Vision
1 # coding:utf8
2
3 import cv2
4
5
6 """
7 捕获摄像头10s的视频信息 写入一个avi文件
8 """
9
10 cameraCapture = cv2.VideoCapture(0) # 传入0代表0号摄像头
11 fps = 30
12 size = (
13 int(cameraCapture.get(cv2.CAP_PROP_FRAME_WIDTH)),
14 int(cameraCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))
15 )
16
17 videoWriter = cv2.VideoWriter(
18 "outputVid.avi",
19 cv2.VideoWriter_fourcc("I", "4", "2", "0"),
20 fps,
21 size
22 )
23
24 success, frame = cameraCapture.read()
25 numFramesRemaining = 10 * fps - 1
26 while success and numFramesRemaining:
27 videoWriter.write(frame)
28 success, frame = cameraCapture.read()
29 numFramesRemaining -= 1
30
31 cameraCapture.release()
32
33
34 """
35 如果使用一组摄像头或多个摄像头
36 用grab和retrieve方法代替
37
38 success0 = cameraCapture.grab()
39 success1 = cameraCapture.grab()
40 if success0 and success1:
41 frame0 = cameraCapture0.retrieve()
42 frame1 = cameraCapture1.retrieve()
43
44
45 """
