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Solution worked for me. I run Anaconda / Python 3.7.4 on Win10 and had installed opencv via some conda package. When trying to load an .avi video created by VLC, I received the error message: "error: (-5:Bad argument) CAP_IMAGES: can't find starting number (in the name of file): ..." After copying the file opencv_ffmpeg3411_64.dll into the \Anaconda3\Lib\site-packages, everything works as expected. Thanks