Qt 5 OpenCV windows deployment error

Bence991

Hello everyone.

I am developing a image corrector app, using QT creator(Qt 5) and OpenCV libraries. I built OpenCV with Cmake, the works fine until try to deploy a release runnable version. For building I using MinGW and for deploying I am using the QT mingw deployment tool. This too,l works fine when I deploy non OpenCV based projects. I am an unexperienced developer and a bit confused where should I start to search the answer. When I try to run the executable in the release folder I got the following error message:The application was unable to start correctly (0xc000007b).
I would be grateful any kind of help.

jsulm

@Bence991 Did you try to copy OpenCV DLLs manualy into your app folder where the executable is?

Bence991

@jsulm Yes I tried. About a year ago I deployed a simple webcamera app which also used OpenCV and I remembered that I had to copy these files that time also.

jsulm

@Bence991 So, does it work now if you copy these DLLs manually?

Bence991

No, I tried it before posted here the problem. I also tried to check the problem with the "Dependencies" program, and as much I understand the UI it did not find any missing dll. I got the same error message, it behaves like I did not used the deployment tool.

SGaist

Hi,

The output looks good.

Just in case, did you also check the OpenCV dlls to see if you have their dependencies as well ?

Bence991

@SGaist I got the same results If I check the Qt based dlls and the opencv dlls, but i am sure the OpenCV part is the key, because I can deploy other non OpenCV based projects with the same method. Just do not understand what is the problem and how to debug it.

SGaist

Did you try to replicate that with a minimal example that uses only a simple call from the OpenCV library ?