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it happens when your ffmpeg or h264 was built without 64bit support

check the guide at this location:

http://www.ozbotz.org/opencv-installation/

specifically parts at 7b and 8b marked IMPORTANT

you ll have to uninstall your current h264/ffmpeg and rebuild them with --enable-shared --enable-fpic flags

i had same error, and after following this guide (using most recent ffmpeg/h264/v4l versions) everything worked perfectly well