openCV 视频分解及合成

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()