ffmpeg configure 不支持 --enable-libopencv 解决

在安装完 opencv 后， 回头来装ffmpeg 支持 openv，有如下问题

ERROR: opencv not found using pkg-config

在没有安装 opencv的情况下，出现这个问题不奇怪，但是已经安装完成 opencv后，依旧有这个问题。

执行命令:

./configure --enable-libopencv

解决:

vi  ~/.bashrc

添加

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH

重新执行:

./configure --enable-libopencv

        linux-vdso.so.1 =>  (0x00007fff115ff000)

        libavdevice.so.56 => /usr/local/lib/libavdevice.so.56 (0x00007fb615e61000)

        libavfilter.so.5 => /usr/local/lib/libavfilter.so.5 (0x00007fb615b0c000)

        libavformat.so.56 => /usr/local/lib/libavformat.so.56 (0x00007fb61573c000)

        libavcodec.so.56 => /usr/local/lib/libavcodec.so.56 (0x00007fb61429a000)

        libavresample.so.2 => /usr/local/lib/libavresample.so.2 (0x00007fb61407c000)

        libpostproc.so.53 => /usr/local/lib/libpostproc.so.53 (0x00007fb613e2e000)

        libswresample.so.1 => /usr/local/lib/libswresample.so.1 (0x00007fb613c13000)

        libswscale.so.3 => /usr/local/lib/libswscale.so.3 (0x00007fb613992000)

        libavutil.so.54 => /usr/local/lib/libavutil.so.54 (0x00007fb61372e000)

        libm.so.6 => /lib64/libm.so.6 (0x0000003664000000)

        libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003663800000)

        libc.so.6 => /lib64/libc.so.6 (0x0000003663400000)

        libdc1394.so.22 => /usr/lib64/libdc1394.so.22 (0x00007fb6134b8000)

        libopencv_imgproc.so.3.0 => /usr/local/lib/libopencv_imgproc.so.3.0 (0x00007fb612588000)

        libopencv_core.so.3.0 => /usr/local/lib/libopencv_core.so.3.0 (0x00007fb611965000)

        libz.so.1 => /lib64/libz.so.1 (0x0000003664800000)

        libx264.so.148 => /usr/local/lib/libx264.so.148 (0x00007fb6115ac000)

        libwavpack.so.1 => /usr/lib64/libwavpack.so.1 (0x0000003663000000)

        libvpx.so.1 => /usr/local/lib/libvpx.so.1 (0x00007fb61130b000)

        libvorbisenc.so.2 => /usr/local/lib/libvorbisenc.so.2 (0x00007fb610f31000)

        libvorbis.so.0 => /usr/local/lib/libvorbis.so.0 (0x00007fb610d00000)

        libtheoraenc.so.1 => /usr/local/lib/libtheoraenc.so.1 (0x00007fb610abc000)

        libtheoradec.so.1 => /usr/local/lib/libtheoradec.so.1 (0x00007fb6108a4000)

        libspeex.so.1 => /usr/lib64/libspeex.so.1 (0x0000003665000000)

        libopenjpeg.so.2 => /usr/lib64/libopenjpeg.so.2 (0x00007fb610684000)

        libmp3lame.so.0 => /usr/local/lib/libmp3lame.so.0 (0x00007fb6103fc000)

        libgsm.so.1 => /usr/lib64/libgsm.so.1 (0x00007fb6101f0000)

        libfdk-aac.so.1 => /usr/local/lib/libfdk-aac.so.1 (0x00007fb60ff3f000)

        libfaac.so.0 => /usr/local/lib/libfaac.so.0 (0x00007fb60fd2d000)

        librt.so.1 => /lib64/librt.so.1 (0x0000003663c00000)

        /lib64/ld-linux-x86-64.so.2 (0x0000003662c00000)

        libraw1394.so.11 => /usr/lib64/libraw1394.so.11 (0x00007fb60fb1e000)

        libusb-1.0.so.0 => /usr/lib64/libusb-1.0.so.0 (0x0000003666c00000)

        libdl.so.2 => /lib64/libdl.so.2 (0x00007fb60f919000)

        libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x000000361fc00000)

        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x000000361f800000)

        libogg.so.0 => /usr/lib64/libogg.so.0 (0x0000003673800000)