Opencv python does not open any video file [closed]

asked 2017-03-22 05:03:49 -0600

naturian gravatar image

I have open cv 3.2.0 in python 2.7.13 on windows 10. Eventually I would like to run a background substractor, but I`m stuck in the very first step. I am not being able to make make to show a frame from a video in a file. Here is the code I have tried to far

import cv2
cam = cv2.VideoCapture("C:\\Users\\Public\\Videos\\Sample Videos\\wildlife.avi")
worked,f = cam.read()
cv2.imshow('f',f)
k=cv2.waitKey(1)

cv2.imshow() gives the following error:

  "error: (-215) size.width>0 && size.height>0 in function cv::imshow"

worked is always returning FALSE, which according to what I could google it implies cam.read() is not reading the frame correctly

I google for solutions but so far none worked. Tried to use , different movies, formats (mp4,avi,wmv), internal codecs (h264, msmpeg4v2). I saw some suggestion of recompiling the library to better interact with 3rd party codecs, but I got opencv from the website, and numpy and matplotlib through pip. It seems drastic to redo it.

Does anyone knows what might be going on?

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Closed for the following reason the question is answered, right answer was accepted by berak
close date 2017-03-22 05:36:38.568047

Comments

1
  • make sure, opencv_ffmpeg(_64).dll is on the PATH (or next to your app)
  • check cam.isOpened() and worked before going on
berak gravatar imageberak ( 2017-03-22 05:17:15 -0600 )edit

First guess, this is due to your windows backend not supporting your codec of the video you are trying to read. I just tried it on Ubuntu with a random *.mp4 video and it works out of the box.

StevenPuttemans gravatar imageStevenPuttemans ( 2017-03-22 05:17:31 -0600 )edit
2

Thank you, once i put opencv_ffmpeg(_64).dll it worked. Wish I could upvote but I do not have enough points

naturian gravatar imagenaturian ( 2017-03-22 05:27:18 -0600 )edit
1

your "thank you" is entirely enough ;)

berak gravatar imageberak ( 2017-03-22 05:36:00 -0600 )edit
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