openCV 视频分解及合成

• 2020 年 1 月 22 日
• 笔记

1. 视频分解

import cv2  # **************************  # 分解视频  cap=cv2.VideoCapture('1.mp4')#获取一个视频cap  isOpen=cap.isOpened()#判断是否打开  fps=cap.get(cv2.CAP_PROP_FPS)#频率，一秒多少张图片  width=int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))#宽  height=int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))#高  count=cap.get(cv2.CAP_PROP_FRAME_COUNT)  print('height,width,count',height,width,count)  i=0  while(isOpen):      if i==10:          break      else:          i+=1      (flag,frame)=cap.read()#读取每一张图片   flag：是否读取成功  frame：读取的照片      fileName='image'+str(i)+'.jpg'      if flag:          cv2.imwrite('./img/'+fileName,frame)  print('end!')

2. 打开摄像头获取图片

# 打开摄像头  cap=cv2.VideoCapture(0) #值为0 打开摄像头  isOpen=cap.isOpened()  i=1  while isOpen:      i+=1      (flag,frame)=cap.read()##读取每一张图片   flag：是否读取成功  frame：读取的照片      cv2.imshow(str(i),frame)      if flag:          cv2.imwrite('./img/'+str(i)+'.jpg',frame)  #     释放对象      if i == 20:          break  cap.release()

3. 图片合成视频

import cv2    fps = 24  fourcc = cv2.VideoWriter_fourcc(*'MJPG')  videoWriter = cv2.VideoWriter('test.avi', fourcc, fps, (1080,1920))  for i in range(1,1000):      p2=i      img12 = cv2.imread('./img/image1.jpg')     # cv2.imshow('img', img12)     # cv2.waitKey(1000/int(fps))      print(str(p2))      videoWriter.write(img12)  videoWriter.release()