For anaconda environment copy opencv_ffmpeg249_64.dll from C:\Python27\rename its version according to your opencv correct versionand past it toC:\Users\KHALID\Anaconda2\Library\bin
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For anaconda environment copy opencv_ffmpeg249_64.dll from C:\Python27\rename its version according to your opencv correct versionand past it toC:\Users\KHALID\Anaconda2\Library\bin