如何使用opencv python从视频中获取图像

Question

我想从视频中获取图像并将其存储为“.jpeg”或“.png”格式，请帮助我如何使用opencv执行此操作我的代码是

 import cv2 vidcap = cv2.VideoCapture('video1.mp4') success,image = vidcap.read() count = 0; print "I am in success" while success: success,image = vidcap.read() cv2.imwrite("frame%d.jpg" % count, image) # save frame as JPEG file if cv2.waitKey(10) == 27: # exit if Escape is hit break count += 1 

在这里，我试图逐帧从视频中获取图像，并将其保存为frame1，frame2，frame3

Answer 1

这是我用来阅读视频并保存帧的方法：

import cv2
import os

def video_to_frames(video, path_output_dir):
    # extract frames from a video and save to directory as 'x.png' where 
    # x is the frame index
    vidcap = cv2.VideoCapture(video)
    count = 0
    while vidcap.isOpened():
        success, image = vidcap.read()
        if success:
            cv2.imwrite(os.path.join(path_output_dir, '%d.png') % count, image)
            count += 1
        else:
            break
    cv2.destroyAllWindows()
    vidcap.release()

video_to_frames('../somepath/myvid.mp4', '../somepath/out')

Answer 2

这是我使用opencv从视频中获取图像的代码

import cv2
print(cv2.__version__)
vidcap = cv2.VideoCapture("Malar.mp4")
print vidcap.read()
success,image = vidcap.read()
count = 0
success = True
while success:
  success,image = vidcap.read()
  print 'Read a new frame: ', success
  cv2.imwrite("frame%d.jpg" % count, image)     # save frame as JPEG file
  count += 1