centos6.10 下编译opencv3.4.6 , opencv_contrib、ffmpeg
第一步,先安装ffmpeg按该网页https://trac.ffmpeg.org/wiki/CompilationGuide/Centos一步步安装仅其中gitclone--depth1https://chromium.googlesource.com/webm/libvpx.git地址无效换https://github.com/webmproject/libvpx/releases地址下载了li