python opencv3 获取摄像头视频

git：https://github.com/linyi0604/Computer-Vision

 # coding:utf8

 import cv2

 """
 捕获摄像头10s的视频信息 写入一个avi文件
 """

 cameraCapture = cv2.VideoCapture(0)     # 传入0代表0号摄像头
 fps = 30
 size = (
     int(cameraCapture.get(cv2.CAP_PROP_FRAME_WIDTH)),
     int(cameraCapture.get(cv2.CAP_PROP_FRAME_HEIGHT))
 )

 videoWriter = cv2.VideoWriter(
     "outputVid.avi",
     cv2.VideoWriter_fourcc("I", "", "", ""),
     fps,
     size
 )

 success, frame = cameraCapture.read()
 numFramesRemaining = 10 * fps - 1
 while success and numFramesRemaining:
     videoWriter.write(frame)
     success, frame = cameraCapture.read()
     numFramesRemaining -= 1

 cameraCapture.release()

 """
 如果使用一组摄像头或多个摄像头
 用grab和retrieve方法代替

 success0 = cameraCapture.grab()
 success1 = cameraCapture.grab()
 if success0 and success1:
     frame0 = cameraCapture0.retrieve()
     frame1 = cameraCapture1.retrieve()

 """