计算机视觉：视频分解图片和图片合成视频

Posted 2022-01-05 il_持之以恒_li

1. 视频分解图片

import cv2


cap = cv2.VideoCapture('QQmessage.mp4')   # 读取视频文件
isOpened = cap.isOpened()    # 判断当前视频是否打开
print(isOpened)
fps = cap.get(cv2.CAP_PROP_FPS)  # 视频的帧率,就是指视频1秒播放图片的个数，一般15张图片，人的视觉就会觉得视频很流畅
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height =int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
print(fps,width,height)
i=0   # 图片的个数
while isOpened:
    if i==10:
        break
    else:
        i+=1
    (flag,frame) = cap.read()   #  flag 是否读取成功，frame 图片内容
    fileName = 'image'+str(i)+'.jpg'
    if flag:
        cv2.imwrite('imgs/'+fileName,frame,[cv2.IMWRITE_JPEG_QUALITY,100])

运行结果：

2. 图片合成视频

import cv2

img = cv2.imread(filename='imgs/image1.jpg')
imgInfo = img.shape
size =(imgInfo[1],imgInfo[0])
print(size)
videoWriter = cv2.VideoWriter('2.mp4',-1,5,size)  # -1 解码器 5 帧率 size 大小
for i in range(1,11):
    fileName = 'imgs/image'+str(i)+'.jpg'
    img = cv2.imread(fileName)
    videoWriter.write(img)
print('end!')