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Asked: 2026-06-09T09:18:01+00:00

I’m using Python bindings to OpenCV 2.4 installed with following instructions . My problem

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I’m using Python bindings to OpenCV 2.4 installed with following instructions.

My problem is similar to this one, but I need Windows machine solution.

Problem: when I try to use 

cap = cv2.VideoCapture(0)
print cap.grab()

it works fine, but the following code

cap = cv2.VideoCapture(filename)
print cap.grab()

always return False.

Path to the file is correct, absolute and has no spaces.

I tried on two machines with Windows XP and Windows 7 with similar results. On Linux (Ubuntu) it works fine for me.

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1 Answer

  1. Editorial Team

    Add C:\OpenCV\3rdparty\ffmpeg\ to the Windows PATH environment variable or copy opencv_ffmpeg.dll from that directory to C:\Python27\ or to a directory that is in the PATH. Alternatively, use the OpenCV binaries from http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv.

    Renaming the opencv_ffmpeg.dll file may also be necessary.

    For OpenCV version X.Y.Z
    opencv_ffmpeg.dll ==> opencv_ffmpegXYZ.dll

    For 64-bit OpenCV version X.Y.Z
    opencv_ffmpeg.dll ==> opencv_ffmpegXYZ_64.dll

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