Cannot open “.mp4” video files using OpenCV 2.4.3, Python 2.7 in Windows 7 machine

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I have had the same issue before, solved by this step:

Check your OpenCV python version

>>> from cv2 import __version__
>>> __version__
'2.4.0'

Then Copy your opencv_ffmpeg.dll to C:\Python27\ and rename it to relevant your OpenCV Python Version. In my case I had to rename it to opencv_ffmpeg240.dll.

Update: On Windows, you can find the opencv_ffmpeg DLL inside of the build folder of your OpenCV installation. For example: C:\dev\opencv\build\x86\vc12\bin

Then, just copy and paste the opencv_ffmpeg<version>.dll file into the root folder of your Python installation.

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