cannot mix incompatible qt library (version 0x40805) with this library (version 0x40804)

[Reena24]

How can i solve this compatibility issue in Windows 7 . Though i have opengl support the next error it shows is this

if i am to downgrade or upgrade it i would like to know where i should download from and the proper steps involved

[BloodAxe]

Sorry, all telepaths are in vacation.. Without a context it's hard to say what is wrong. According to this output, there is version conflict of Qt versions (4.8.5 and 4.8.4). You configured OpenCV to use Qt, did you?

[Reena24]

Yeah i did configure OpenCV to use Qt. But how to i remove version 4.8.4 since i am new to opencv i dont know how to solve the problem. I configured opencv according yo the instructions in http://docs.opencv.org/2.4.4/doc/tutorials/introduction/windows_install/windows_install.html#installation-by-making-your-own-libraries-from-the-source-files which enables the Qt version. I downloaded qt-everywhere-opensource-src-4.8.5 from http://qt-project.org/downloads and extracted it in a qt folder for which i have configured according to the instruction. I really want some help cause am stuck with trying to execute the code for past three weeks. I tried to execute a simple program to check the problem. This is the sample code i tried.

include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[]) { return 0; }

include <opencv2\core\core.hpp>

include <opencv2\highgui\highgui.hpp>

include <opencv2/core/opengl_interop.hpp>

include

include "E:\OpenCV\Build\cvconfig.h"

ifndef HAVE_OPENGL

int main() { std::cerr << "Library was built without OpenGL support" << std::endl; return -1; }

else

ifdef WIN32

#define WIN32_LEAN_AND_MEAN 1
#define NOMINMAX 1
#include <windows.h>

endif

if defined(APPLE)

#include <OpenGL/gl.h>
#include <OpenGL/glu.h>

else

#include <GL/gl.h>
#include <GL/glu.h>

endif

using namespace cv; using namespace std; void on_opengl(void* userdata);

int main(void) { VideoCapture webcam(CV_CAP_ANY);

namedWindow("window", CV_WINDOW_OPENGL);

Mat frame;
ogl::Texture2D tex;

setOpenGlDrawCallback("window", on_opengl, &tex);

while(waitKey(30) < 0)
{
    webcam >> frame;
    tex.copyFrom(frame);
    updateWindow("window");
}

setOpenGlDrawCallback("window", 0, 0);
destroyAllWindows();

return 0;

}

void on_opengl(void* userdata) { ogl::Texture2D* pTex = static_castogl::Texture2D*(userdata); if (pTex->empty()) return;

glLoadIdentity();

glTranslated(0.0, 0.0, 1.0);

glRotatef( 55, 1, 0, 0 );
glRotatef( 45, 0, 1, 0 );
glRotatef( 0, 0, 0, 1 );

static const int coords[6][4][3] = {
    { { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } },
    { { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } },
    { { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } },
    { { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } },
    { { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } },
    { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } }
};

glEnable(GL_TEXTURE_2D);
pTex->bind();

for (int i = 0; i < 6; ++i) {
            glColor3ub( i*20, 100+i*10, i*42 );
            glBegin(GL_QUADS);
            for (int j = 0; j < 4; ++j) {
                    glVertex3d(0.2*coords[i][j][0], 0.2 * coords[i][j][1], 0.2*coords[i][j][2]);
            }
            glEnd();
}

}

endif

The code displays an error when it reaches the line namedWindow("window", CV_WINDOW_OPENGL); and setOpenGlDrawCallback("window", on_opengl, &tex); . The same error comes when i try for the MarkerlessAR code at the same point. Could you please help solve this error. Please.

[Reena24]

Also i have 2 versions of Microsoft sdk C:\Program Files\Microsoft SDKs\Windows\v6.0A (old version) C:\Program Files\Microsoft SDKs\Windows\v6.1 (new version ) am not sure which opengl version is being conisidered

[madduci]

Just remove all Qt versions you have, download the base 4.8.0 and recompile OpenCV with 4.8.0.

On Windows, latest Qt makes problems, unless you switch to Linux

[Reena24]

But where can i get 4.8.0 source code version from. I tried to search for 4.8.4 and i couldn't find the link

[Reena24]

Also I have a doubt if i install 4.8.0 will it show compatibility problem again. Could i get some link where i can download it from

[madduci]

You just look on Qt website and select "previous versions". On www.pointclouds.org in Download section there is the link to Qt 4.8.0 for MSVC2010 Am 10.02.2014 18:13 schrieb "Reena24" notifications@github.com:

Also I have a doubt if i install 4.8.0 will it show compatibility problem again. Could i get some link where i can download it from

Reply to this email directly or view it on GitHubhttps://github.com/MasteringOpenCV/code/issues/27#issuecomment-34656152 .

[Reena24]

Thanks a lot i reconfigured using Qt 4.8.4 and now its executing with no problems.

[BloodAxe]

Glad to hear!

[Reena24]

Thanks a lot my Markerless AR code has finally started to execute but i cant understand one thing why does the cube keep on moving when using an image and camera as input