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For me on Windows 8.1 it helped:

1. to use DLLs inside installation package: sources/3rdparty/ffmpeg (opencv_ffmpeg.dll and opencv, _ffmpeg_64.dll)
2. copy them to c:\Python27 directory and rename them accordingly to openCV version used.

for openCV 2.4.10

• opencv_ffmpeg2410.dll
• opencv_ffmpeg2410_64.dll

for openCV 3.0.0 beta

• opencv_ffmpeg300.dll
• opencv_ffmpeg300_64.dll