mmp,心里真的是一万只cnm飘过，好心累

1.安装时遇到的第一个问题2. 解决方法3.新的问题又来了4.终结方法

1.安装时遇到的第一个问题

上问题代码：

/usr/bin/ld: warning: libopencv_core.so.2.4, needed by //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libopencv_imgproc.so.2.4, needed by //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5, not found (try using -rpath or -rpath-link) //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5: undefined reference to `cvSmooth' //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5: undefined reference to `cvErode' //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5: undefined reference to `cvReleaseStructuringElement' //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5: undefined reference to `cvCreateStructuringElementEx' //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5: undefined reference to `cvCreateImageHeader' //usr/lib/x86_64-linux-gnu/libavfilter-ffmpeg.so.5: undefined reference to `cvDilate' collect2: error: ld returned 1 exit status tools/VideoViewer/CMakeFiles/VideoViewer.dir/build.make:122: recipe for target 'tools/VideoViewer/VideoViewer' failed make[2]: *** [tools/VideoViewer/VideoViewer] Error 1 CMakeFiles/Makefile2:289: recipe for target 'tools/VideoViewer/CMakeFiles/VideoViewer.dir/all' failed make[1]: *** [tools/VideoViewer/CMakeFiles/VideoViewer.dir/all] Error 2 Makefile:149: recipe for target 'all' failed make: *** [all] Error 2

各位老铁也一定百度了不少，也看得懂这个问题出在哪 问题就处在ffmpeg不兼容，可能是版本原因

2. 解决方法

卸载ffmpeg

sudo apt-get purge ffmpeg

卸载后在官网上手动下载：http://ffmpeg.org/releases/ffmpeg-4.3.tar.xz 再解压、安装。

3.新的问题又来了

当再重新进入pangolin/bulid/中编译make时，又出现错误如下：

src/CMakeFiles/pangolin.dir/build.make:662: recipe for target 'src/CMakeFiles/pangolin.dir/video/video_output.cpp.o' failed make[2]: *** [src/CMakeFiles/pangolin.dir/video/video_output.cpp.o] Error 1 make[2]: *** Waiting for unfinished jobs.... src/CMakeFiles/pangolin.dir/build.make:638: recipe for target 'src/CMakeFiles/pangolin.dir/video/video.cpp.o' failed make[2]: *** [src/CMakeFiles/pangolin.dir/video/video.cpp.o] Error 1 CMakeFiles/Makefile2:135: recipe for target 'src/CMakeFiles/pangolin.dir/all' failed make[1]: *** [src/CMakeFiles/pangolin.dir/all] Error 2 Makefile:127: recipe for target 'all' failed make: *** [all] Error 2

还是找啊找 最后还是看到博客：Ubuntu 14.04下安装Pagolin遇到的问题及解决方法（之一）中的方法才成功安装。

4.终结方法

到Pagolin/src文件夹下，在CMakeList.txt中删去下面这段代码（屏蔽掉ffmpeg的影响）：

find_package(FFMPEG QUIET) if(BUILD_PANGOLIN_VIDEO AND FFMPEG_FOUND) set(HAVE_FFMPEG 1) list(APPEND INTERNAL_INC ${FFMPEG_INCLUDE_DIRS} ) list(APPEND LINK_LIBS ${FFMPEG_LIBRARIES} ) list(APPEND HEADERS ${INCDIR}/video/drivers/ffmpeg.h) list(APPEND SOURCES video/drivers/ffmpeg.cpp) list(APPEND VIDEO_FACTORY_REG RegisterFfmpegVideoFactory ) list(APPEND VIDEO_FACTORY_REG RegisterFfmpegVideoOutputFactory ) if(_GCC_) # FFMPEG is a real pain for deprecating the API. set_source_files_properties(video/drivers/ffmpeg.cpp PROPERTIES COMPILE_FLAGS "-Wno-deprecated-declarations") endif() message(STATUS "ffmpeg Found and Enabled") endif()

【可能原因】ffmpeg库和Pagolin版本之间可能存在冲突。本文的解决办法，以及其他可能的解决方法（如修改Pagolin的部分代码）和原因请参见下面这个帖子：

https://github.com/stevenlovegrove/Pangolin/issues/27