python cv2.Videocapture()不起作用，cap.isOpened()返回false [英] python cv2.Videocapture() does not work, cap.isOpened() returns false

问题描述

cv2.Videocapture()在使用网络摄像头时工作正常，但在尝试从硬盘驱动器读取时显示错误cap.isOpened()返回false

cv2.Videocapture() works fine while using webcam but while trying to read from hard drive it shows error cap.isOpened() returns false

import cv2
import numpy as np
background=cv2.imread('background.png')
cap = cv2.VideoCapture('car video.mp4')
cap.open('car video.mp4')
print cap.isOpened()
while 1:
    ret,img=cap.read()
    cv2.imshow('a',img)
    print img.shape


    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

它显示此错误

    cv2.imshow('a',img)
    error: ..\..\..\..\opencv\modules\highgui\src\window.cpp:266: error:       (-215)        size.width>0 && size.height>0 in function cv::imshow

我的opencv版本3.0.0，python 2.7，windows10 32位

my opencv version 3.0.0, python 2.7, windows10 32 bit

推荐答案

您需要ffmpeg编解码器才能运行视频

you need ffmpeg codec to can run the video

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