Python3读取视频&保存视频

import cv2

from matplotlib import pyplot as plt

#通过cv2中的类获取视频流操作对象cap

cap = cv2.VideoCapture('rtsp://admin:passwd@10.130.10.111:554/MPEG-4/ch1/main/av_stream')

#调用cv2方法获取cap的视频帧（帧：每秒多少张图片）

fps = cap.get(cv2.CAP_PROP_FPS)

print(fps)

#获取cap视频流的每帧大小

size = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),

    int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))

print(size)

#定义编码格式mpge-4

fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', '2')

#定义视频文件输入对象

outVideo = cv2.VideoWriter('saveDir.avi',fourcc,fps,size)

#获取视频流打开状态

if cap.isOpened():

  rval,frame = cap.read()

  print('ture')

else:

  rval = False

  print('False')

tot=1

c=1

#循环使用cv2的read()方法读取视频帧

while rval:

  rval,frame = cap.read()

  cv2.imshow('test',frame)

  #每间隔20帧保存一张图像帧

  # if tot % 20 ==0 :

  #   cv2.imwrite('cut/'+'cut_'+str(c)+'.jpg',frame)

  #   c+=1

  tot+=1

  print('tot=',tot)

  #使用VideoWriter类中的write(frame)方法，将图像帧写入视频文件

  outVideo.write(frame)

  cv2.waitKey(1)

cap.release()

outVideo.release()

cv2.destroyAllWindows()