Why can't I open avi video in openCV?

Question

I just wrote a simple video reading example with openCV2.3.1, but it seems that I cannot open avi video anyway :(

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Answer 1

Open D:\OpenCV\build\x64\vc14\bin and copy the opencv_ffmpeg320.dll or opencv_ffmpeg320_64.dll which is relevant for you based on your Windows (x86 or x64).

opencv_ffmpeg320.dll -> for 32-bit Windows (x86)

opencv_ffmpeg320_64.dll -> for 64-bit Windows (x64)

Paste the copied .dll to C:\Python27\ or any location which is accessible from Windows PATH environment variables.

Alternatively, you could create a folder D:\OpenCV\vendor\ and add .dll file to that folder and then add D:\OpenCV\vendor\ to your windows environment variables.