opencv installation ffmpeg error

I have been trying to install opencv for a long time in my fedora 20 32 bit system.I followed the instructions from http://docs.opencv.org/trunk/doc/py_tutorials/py_setup/py_setup_in_fedora/py_setup_in_fedora.html#install-opencv-python-in-fedora But after all cmake commands when I m trying to make it I am getting an error again and again.

    scanning dependencies of target opencv_createsamples
     [100%] Building CXX object    apps/haartraining/CMakeFiles/opencv_createsamples.dir/createsamples.cpp.o
    Linking CXX executable ../../bin/opencv_createsamples
   /lib/libavcodec.so.55: undefined reference to `vpx_codec_vp9_dx_algo'
    /lib/libavcodec.so.55: undefined reference to `vpx_codec_vp9_cx_algo'
    collect2: error: ld returned 1 exit status
    make[2]: *** [bin/opencv_createsamples] Error 1
   make[1]: *** [apps/haartraining/CMakeFiles/opencv_createsamples.dir/all] Error 2
    make: *** [all] Error 2

I have followed so many articles about the ffmpeg versions and updating stuff but did understand a little. but when I tried

$ sudo yum update ffmpeg

I got the error as

>Package(s) ffmpeg available, but not installed.
No packages marked for update

What should I do?

Answer

I found this link on the subject of linking OpenCV to FFmpeg on Linux: How to install FFmpeg & OpenCV under Fedora Linux

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Answer