Using opencv to open a IP Cam http stream on Windows

asked 2018-04-14 16:25:11 -0600

I wrote the following Python code:

import cv2

cap = cv2.VideoCapture()"http://<user>:<password>@<ip>/mjpeg.cgi?user=<user>&password=<password&channel=0")

while (cap.isOpened()):
    ret, frame =
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):

The code works fine on Linux, but on Windows, I got the following error:

$ python
warning: Error opening file (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:808)
warning: http://<user>:<password>@<ip>/mjpeg.cgi?user=<user>&password=<password&channel=0 (/build/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:809)

I suspect there's something wrong with my Windows opencv build, but couldn't figure out what. Please let me know if you have any ideas. Thanks.

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make sure, opencv_ffmpeg64.dll is on your PATH

berak gravatar imageberak ( 2018-04-15 04:00:27 -0600 )edit

I do have opencv_ffmpeg340_64.dll in my path. Also, the code works on Windows if I specify a mp4 file instead of an URL. It also works with the built-in webcam if I specify an index of 0 instead of the URL. Thanks.

crocodile gravatar imagecrocodile ( 2018-04-16 14:00:41 -0600 )edit