我正在尝试将一个VideoIO用 MATLAB 调用的视频库用于机器学习项目。当我尝试在 MATLAB 中调用该库时，我收到一条错误消息，指出它找不到libavutil.so.50VideoIO 所依赖的 ffmpeg 库之一。我检查了一些不同的东西，但除了它没有运行之外，找不到任何看起来错误的东西。谁能建议其他检查以帮助我调试？
这是错误：
error while loading shared libraries: libavutil.so.50: cannot open shared object file: No such file or directory
??? Error using ==> videoReader_ffmpegPopen2 EOF found while trying to read the communication tag.
The server process probably died.
String so far: "" Function: int VideoIO::readMessageHeader(FILE*)
File : pipecomm.h Line : 306
Error in ==> videoReader.videoReader at 152 vr.handle = feval(vr.plugin, 'open',vr.handle, ...
试图弄清楚出了什么问题，我发现vr分配在哪里：
vr = struct('plugin',pvtVideoIO_mexName(mfilename, plugin), ... 'handle',int32(-1));
我打印出来mfilename，然后在ldd它指向的文件上运行：
$ ldd videoReader_ffmpegPopen2Server
linux-vdso.so.1 => (0x00007fff41dff000)
libavutil.so.50 => /u/goodfeli/ffmpeg/libavutil/libavutil.so.50 (0x00007fd5f2895000)
libavdevice.so.52 => /u/goodfeli/ffmpeg/libavdevice/libavdevice.so.52 (0x00007fd5f268c000)
libavformat.so.52 => /u/goodfeli/ffmpeg/libavformat/libavformat.so.52 (0x00007fd5f23bf000)
libavcodec.so.52 => /u/goodfeli/ffmpeg/libavcodec/libavcodec.so.52 (0x00007fd5f1792000)
libavfilter.so.1 => /u/goodfeli/ffmpeg/libavfilter/libavfilter.so.1 (0x00007fd5f1584000)
libswscale.so.0 => /u/goodfeli/ffmpeg/libswscale/libswscale.so.0 (0x00007fd5f1351000)
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x000000378ea00000)
libm.so.6 => /lib64/libm.so.6 (0x0000003788a00000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x000000378c600000)
libc.so.6 => /lib64/libc.so.6 (0x0000003788600000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003789200000)
libasound.so.2 => /lib64/libasound.so.2 (0x000000379a200000)
libbz2.so.1 => /lib64/libbz2.so.1 (0x0000003b0b400000)
libz.so.1 => /lib64/libz.so.1 (0x0000003789600000)
/lib64/ld-linux-x86-64.so.2 (0x0000003787400000)
libdl.so.2 => /lib64/libdl.so.2 (0x0000003788e00000)
librt.so.1 => /lib64/librt.so.1 (0x000000378b200000)
现在，通过复制粘贴 libavutil 的路径，我验证它是否正确：
$ ls /u/goodfeli/ffmpeg/libavutil/libavutil.so.50
/u/goodfeli/ffmpeg/libavutil/libavutil.so.50
所以该文件存在。现在在 MATLAB 中，我检查 MATLAB 的 LD_LIBRARY_PATH 变量：
>> getenv('LD_LIBRARY_PATH')
ans = /soft/diro/share/matlabr2009b/sys/os/glnxa64:/soft/diro/share/matlabr2009b/bin/glnxa64:/soft/diro/share/matlabr2009b/extern/lib/glnxa64:/soft/diro/share/matlabr2009b/runtime/glnxa64:/soft/diro/share/matlabr2009b/sys/java/jre/glnxa64/jre/lib/amd64/native_threads:/soft/diro/share/matlabr2009b/sys/java/jre/glnxa64/jre/lib/amd64/server:/soft/diro/share/matlabr2009b/sys/java/jre/glnxa64/jre/lib/amd64:/u/goodfeli/ffmpeg/libavfilter:/u/goodfeli/ffmpeg/libswscale:/u/goodfeli/ffmpeg/libavdevice:/u/goodfeli/ffmpeg/libavformat:/u/goodfeli/ffmpeg/libavcodec:/u/goodfeli/ffmpeg/libavutil:/opt/lisa/os/cuda/lib64:/opt/lisa/os/cuda/lib:/opt/lisa/byhost/lib:/opt/lisa/os/lib/vtk:/opt/lisa/os/lib/intelmkl/lib/32:/opt/lisa/os/lib:/opt/lisa/os/lib64:/usr/local/lib:/usr/lib64/atlas/::/opt/lisa/os/panda/lib:/opt/lisa/os/lib32:/opt/lisa/byhost/lib32
这似乎是正确的，它包括/u/goodfeli/ffmpeg/libavutil/并通过复制粘贴它我可以验证没有错字：
$ ls /u/goodfeli/ffmpeg/libavutil/ | grep "\.so"
对接下来要检查的内容有什么建议吗？提前致谢。