如果opencv和FPGA的版本不对应，则会出现如下warning

/usr/bin/ld: warning: libavcodec.so.57, needed by /usr/lib/gcc/aarch64-linux-gnu/7/../../../aarch64-linux-gnu/libopencv_videoio.so, may conflict with libavcodec.so.58
/usr/bin/ld: warning: libavformat.so.57, needed by /usr/lib/gcc/aarch64-linux-gnu/7/../../../aarch64-linux-gnu/libopencv_videoio.so, may conflict with libavformat.so.58
/usr/bin/ld: warning: libavutil.so.55, needed by /usr/lib/gcc/aarch64-linux-gnu/7/../../../aarch64-linux-gnu/libopencv_videoio.so, may conflict with libavutil.so.56
/usr/bin/ld: warning: libswscale.so.4, needed by /usr/lib/gcc/aarch64-linux-gnu/7/../../../aarch64-linux-gnu/libopencv_videoio.so, may conflict with libswscale.so.5

该warning会导致空指针等错误。

OPENCV是要调用FPGA的来实现某些功能。