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export LD_LIBRARY_PATH=/ffmpeg_install_path/lib/
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/ffmpeg_install_path/lib/pkgconfig
export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR:/ffmpeg_install_path/lib/

before make -j 4 seems did it.

I couldn't seems to post my own answer so this is it.

System: Ubuntu 15.04 x64

While make all -j 4, this is what I get after 51%

[ 51%] Building CXX object modules/features2d/CMakeFiles/opencv_test_features2d.dir/test/test_mser.cpp.o
../../lib/libopencv_highgui.a(cap_ffmpeg.cpp.o): In function `CvVideoWriter_FFMPEG::writeFrame(unsigned char const*, int, int, int, int, int)':
cap_ffmpeg.cpp:(.text._ZN20CvVideoWriter_FFMPEG10writeFrameEPKhiiiii+0x18c): undefined reference to `avcodec_encode_video'
../../lib/libopencv_highgui.a(cap_ffmpeg.cpp.o): In function `CvVideoWriter_FFMPEG::close()':
cap_ffmpeg.cpp:(.text._ZN20CvVideoWriter_FFMPEG5closeEv+0x146): undefined reference to `avcodec_encode_video'
collect2: error: ld returned 1 exit status
modules/highgui/CMakeFiles/opencv_test_highgui.dir/build.make:381: recipe for target 'bin/opencv_test_highgui' failed
make[2]: *** [bin/opencv_test_highgui] Error 1
CMakeFiles/Makefile2:1875: recipe for target 'modules/highgui/CMakeFiles/opencv_test_highgui.dir/all' failed
make[1]: *** [modules/highgui/CMakeFiles/opencv_test_highgui.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 51%] Building CXX object modules/features2d/CMakeFiles/opencv_test_features2d.dir/test/test_main.cpp.o
[ 51%] Building CXX object modules/features2d/CMakeFiles/opencv_test_features2d.dir/test/test_fast.cpp.o
[ 52%] Building CXX object modules/features2d/CMakeFiles/opencv_test_features2d.dir/test/test_nearestneighbors.cpp.o
[ 52%] Building CXX object modules/features2d/CMakeFiles/opencv_test_features2d.dir/test/test_brisk.cpp.o
[ 52%] Building CXX object modules/calib3d/CMakeFiles/opencv_perf_calib3d.dir/perf/perf_cicrlesGrid.cpp.o
[ 52%] Building CXX object modules/features2d/CMakeFiles/opencv_test_features2d.dir/test/test_descriptors_regression.cpp.o
[ 52%] Building CXX object modules/calib3d/CMakeFiles/opencv_perf_calib3d.dir/perf/perf_main.cpp.o
Linking CXX executable ../../bin/opencv_perf_calib3d
Linking CXX executable ../../bin/opencv_test_features2d
[ 52%] Built target opencv_perf_calib3d
[ 52%] Built target opencv_test_features2d
Makefile:147: recipe for target 'all' failed
make: *** [all] Error 2

Any pointer?