python+opencv打开摄像头,保存视频、拍照功能的实现方法

# coding:utf-8
import cv2
import sys
reload(sys)
sys.setdefaultencoding('utf8')
cap = cv2.VideoCapture(0)
cap.set(3,640)
cap.set(4,480)
cap.set(1, 10.0)
#此处fourcc的在MAC上有效，如果视频保存为空，那么可以改一下这个参数试试, 也可以是-1
fourcc = cv2.cv.CV_FOURCC('m', 'p', '4', 'v')
# 第三个参数则是镜头快慢的，10为正常，小于10为慢镜头
out = cv2.VideoWriter('/opt/code/video/output2.avi', fourcc,10,(640,480))
while True:
 ret,frame = cap.read()
 if ret == True:
  frame = cv2.flip(frame, 1)
  a = out.write(frame)
  cv2.imshow("frame", frame)
  if cv2.waitKey(1) & 0xFF == ord('q'):
   break
 else:
  break
cap.release()
out.release()
cv2.destroyAllWindows()

import cv2

cap = cv2.VideoCapture(0)
while(1):
 # get a frame
 ret, frame = cap.read()
 # show a frame
 cv2.imshow("capture", frame)
 if cv2.waitKey(1) & 0xFF == ord('q'):
  cv2.imwrite("/opt/code/image/fangjian2.jpeg", frame)
  break
cap.release()
cv2.destroyAllWindows()