Opencv fails to open avi with ffdshow codec?

OpenCV is managing video files in different manners depending your OpenCV compilation and configuration, like Video for Windows (Vfw), Win32, ffdshow...if your codec is installed only as a filter for DirectShow and OpenCV is trying to open this video with VfW32. Dll the codec cannot be seen.

Ffdshow isn't a codec it's a package of codecs. You can determine what codec is actually used by either the options you passed to ffdshow (particulalrly the fourcc) or with gspot.

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