OpenCV将框架写入文件python [英] OpenCV write frame to file python

问题描述

嘿，即时通讯开始使用OpenCV，我无法将网络摄像头输出保存到文件中.这就是我所拥有的.这样可以正常运行，启动网络摄像头并创建"output.avi".问题是output.avi很小(414字节)，每次我运行程序时都具有相同的确切字节. 我猜问题出在fourcc编码上，但是我还无法找到适合我的情况.我正在Mac OS X上运行.如果您需要更多信息，请告诉我.

Hey so im starting to play around with OpenCV and I cant get my webcam output saved to a file. Here is what I have. This runs fine, launches the webcam and creates "output.avi" The issue is output.avi is tiny(414 bytes) and the same exact bytes each time I run the program. Im guessing the issue is with the fourcc encoding but I havent been able to find what works in my case. I am running on Mac OS X. Let me know if you need anymore information.

import numpy as np
import cv2

path = ('/full/path/Directory/output.avi')

cap = cv2.VideoCapture(0)
cap.set(1, 20.0) #Match fps
cap.set(3,640)   #Match width
cap.set(4,480)   #Match height

fourcc = cv2.cv.CV_FOURCC(*'XVID')
video_writer = cv2.VideoWriter(path,fourcc, 20.0, (640,480))

while(cap.isOpened()):
    #read the frame
    ret, frame = cap.read()
    if ret==True:
        #show the frame
        cv2.imshow('frame',frame)
        #Write the frame
        video_writer.write(frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# Release everything if job is finished
cap.release()
video_writer.release()
cv2.destroyAllWindows()

推荐答案

只需更改

fourcc = cv2.cv.CV_FOURCC(*'XVID')

到

fourcc = cv2.cv.CV_FOURCC('m', 'p', '4', 'v')

在这里找到答案: 在OSX下使用opencv VideoWriter不会产生任何输出

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