Invalid MEX-file on Ubuntu 12.04 about mexopencv HOT 4 CLOSED

recently I was having the same problem. Just set up the LD_LIBRARY_PATH as
environment variable, to the directory containing your opencv libraries (i
put it in the .bashrc). then restart you matlab. It should solve it.

On Mon, Mar 18, 2013 at 1:47 PM, Andreas Kotowicz
[email protected]:

I get an invalid mex-file error but all my libraries are ok:

Example nbr 1:

run:
detector = cv.CascadeClassifier('haarcascade_frontalface_alt.xml');

output:

Invalid MEX-file '/tmp/+cv/private/CascadeClassifier_.mexa64':
/usr/local/lib/libopencv_highgui.so.2.4: undefined symbol:
_ZNK9QCheckBox15minimumSizeHintEv`

Example nbr 2:

run:

cv.imread

output:
Error using cv.imread
Invalid MEX-file '/tmp/+cv/imread.mexa64':
/usr/local/lib/libopencv_highgui.so.2.4: undefined symbol:
_ZNK9QCheckBox15minimumSizeHintEv

Outout from ldd /usr/local/lib/libopencv_highgui.so.2.4:

linux-vdso.so.1 => (0x00007fff2436d000)
libopencv_core.so.2.4 => /usr/local/lib/libopencv_core.so.2.4 (0x00007ff54dd6c000)
libopencv_imgproc.so.2.4 => /usr/local/lib/libopencv_imgproc.so.2.4 (0x00007ff54d88b000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff54d633000)
libGL.so.1 => /usr/lib/nvidia-current-updates/libGL.so.1 (0x00007ff54d316000)
libjpeg.so.8 => /usr/lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007ff54d0c6000)
libpng12.so.0 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libpng12.so.0 (0x00007ff54cea0000)
libtiff.so.4 => /usr/lib/x86_64-linux-gnu/libtiff.so.4 (0x00007ff54cc3d000)
libjasper.so.1 => /usr/lib/x86_64-linux-gnu/libjasper.so.1 (0x00007ff54c9e6000)
libIlmImf.so.6 => /usr/lib/libIlmImf.so.6 (0x00007ff54c724000)
libHalf.so.6 => /usr/lib/libHalf.so.6 (0x00007ff54c4e1000)
libgstreamer-0.10.so.0 => /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so.0 (0x00007ff54c1fa000)
libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007ff54bfaa000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007ff54bcb5000)
libgstapp-0.10.so.0 => /usr/lib/x86_64-linux-gnu/libgstapp-0.10.so.0 (0x00007ff54baa9000)
libgstvideo-0.10.so.0 => /usr/lib/x86_64-linux-gnu/libgstvideo-0.10.so.0 (0x00007ff54b88c000)
libdc1394.so.22 => /usr/lib/x86_64-linux-gnu/libdc1394.so.22 (0x00007ff54b619000)
libv4l1.so.0 => /usr/local/lib/libv4l1.so.0 (0x00007ff54b413000)
libavcodec.so.54 => /usr/local/lib/libavcodec.so.54 (0x00007ff54a56f000)
libavformat.so.54 => /usr/local/lib/libavformat.so.54 (0x00007ff54a24c000)
libavutil.so.51 => /usr/local/lib/libavutil.so.51 (0x00007ff54a026000)
libswscale.so.2 => /usr/local/lib/libswscale.so.2 (0x00007ff549dda000)
libQtOpenGL.so.4 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libQtOpenGL.so.4 (0x00007ff549af0000)
libQtGui.so.4 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libQtGui.so.4 (0x00007ff548e12000)
libQtCore.so.4 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libQtCore.so.4 (0x00007ff548963000)
libQtTest.so.4 => /usr/lib/x86_64-linux-gnu/libQtTest.so.4 (0x00007ff54873d000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff548441000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff548140000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff547f2a000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff547b6b000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff547953000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007ff54774b000)
libtbb.so.2 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libtbb.so.2 (0x00007ff54760c000)
/lib64/ld-linux-x86-64.so.2 (0x00007ff54e44a000)
libnvidia-tls.so.304.64 => /usr/lib/nvidia-current-updates/tls/libnvidia-tls.so.304.64 (0x00007ff547408000)
libnvidia-glcore.so.304.64 => /usr/lib/nvidia-current-updates/libnvidia-glcore.so.304.64 (0x00007ff54501e000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007ff544cea000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007ff544ad8000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff5448d4000)
libImath.so.6 => /usr/lib/libImath.so.6 (0x00007ff5446cd000)
libIex.so.6 => /usr/lib/libIex.so.6 (0x00007ff5444ae000)
libIlmThread.so.6 => /usr/lib/libIlmThread.so.6 (0x00007ff5442a7000)
libgmodule-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007ff5440a3000)
libxml2.so.2 => /usr/lib/x86_64-linux-gnu/libxml2.so.2 (0x00007ff543d47000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007ff543b3f000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007ff543902000)
libgstbase-0.10.so.0 => /usr/lib/x86_64-linux-gnu/libgstbase-0.10.so.0 (0x00007ff5436ae000)
liborc-0.4.so.0 => /usr/lib/x86_64-linux-gnu/liborc-0.4.so.0 (0x00007ff543433000)
libraw1394.so.11 => /usr/lib/x86_64-linux-gnu/libraw1394.so.11 (0x00007ff543223000)
libusb-1.0.so.0 => /lib/x86_64-linux-gnu/libusb-1.0.so.0 (0x00007ff543014000)
libv4l2.so.0 => /usr/local/lib/libv4l2.so.0 (0x00007ff542e08000)
libxvidcore.so.4 => /usr/lib/x86_64-linux-gnu/libxvidcore.so.4 (0x00007ff542ad0000)
libx264.so.128 => /usr/local/lib/libx264.so.128 (0x00007ff542747000)
libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 (0x00007ff542278000)
libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 (0x00007ff54204b000)
libtheoraenc.so.1 => /usr/lib/x86_64-linux-gnu/libtheoraenc.so.1 (0x00007ff541e0e000)
libtheoradec.so.1 => /usr/lib/x86_64-linux-gnu/libtheoradec.so.1 (0x00007ff541bf3000)
libopencore-amrwb.so.0 => /usr/lib/libopencore-amrwb.so.0 (0x00007ff5419d6000)
libopencore-amrnb.so.0 => /usr/lib/libopencore-amrnb.so.0 (0x00007ff54179c000)
libmp3lame.so.0 => /usr/lib/x86_64-linux-gnu/libmp3lame.so.0 (0x00007ff541512000)
libfaac.so.0 => /usr/lib/libfaac.so.0 (0x00007ff5412ff000)
libfreetype.so.6 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libfreetype.so.6 (0x00007ff541080000)
libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007ff540e75000)
libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007ff540c6c000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007ff540a66000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007ff54082f000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007ff540611000)
libv4lconvert.so.0 => /usr/local/lib/libv4lconvert.so.0 (0x00007ff54039c000)
libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 (0x00007ff540195000)
libexpat.so.1 => /share/pkgs/MATLAB/R2012b/bin/glnxa64/libexpat.so.1 (0x00007ff53ff6c000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007ff53fd69000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007ff53fb62000)

This is ubuntu 12.04 with opencv 2.4.4a.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/64
.

from mexopencv.

hmm, doesn't help.
I found this link but it didn't help since I have all qt libraries installed.

what's the best way to debug this?

from mexopencv.

Compare the output of ldd on the MEX-file both run from inside MATLAB and on the system shell (similar to #62).

Take note of the Qt libraries. If there is a mismatch, try using LD_LIBRARY_PATH and/or LD_PRELOAD tricks

from mexopencv.

Problem goes away using the correct preloading:

LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libQtCore.so:/usr/lib/x86_64-linux-gnu/libQtGui.so:/usr/lib/x86_64-linux-gnu/libQtOpenGL.so /usr/local/bin/matlab-2012b

from mexopencv.