Error message in debug mode

C++
1

I get error messages when debugging which are not in the release:
INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\parallel\registry_parallel.impl.hpp (96) cv::parallel::ParallelBackendRegistry::ParallelBackendRegistry core(parallel): Enabled backends(3, sorted by priority): ONETBB(1000); TBB(990); OPENMP(980)
[ INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load W:\MyProgrammingMain\CppOpenCVcons\x64\Debug\opencv_core_parallel_onetbb454_64d.dll => FAILED
[ INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_core_parallel_onetbb454_64d.dll => FAILED
[ INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load W:\MyProgrammingMain\CppOpenCVcons\x64\Debug\opencv_core_parallel_tbb454_64d.dll => FAILED
[ INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_core_parallel_tbb454_64d.dll => FAILED
[ INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load W:\MyProgrammingMain\CppOpenCVcons\x64\Debug\opencv_core_parallel_openmp454_64d.dll => FAILED
[ INFO:0] global c:\build\master_winpack-build-win64-vc15\opencv\modules\core\src\utils\plugin_loader.impl.hpp (67) cv::plugin::impl::DynamicLib::libraryLoad load opencv_core_parallel_openmp454_64d.dll => FAILED
As I understand it, it is reported that libraries cannot be loaded for debug. In this regard, I have the following questions:

  • why are there no error messages in release mode?
  • are the functions of these libraries included in opencv_world454.dll? If no, are these libraries needed to solve complex computational problems and, if so, where can they be downloaded (or how can they be compiled);
2

it’s an INFO, not an ERROR msg,
you’re safe to ignore it,
and it will only show up in DEBUG build.

3

Thanks for the reply. But still I would like to know if the functions of these libraries are included in opencv_world454.dll or not.

4

no, they’re not included.
there are plans for “plugin systems”, to replace e.g. gui toolkits, parallel frameworks, or VideoCapture backends at runtime, by loading some so/dll,
but none of those are supplied, as of now.

5

Thanks for the reply. I understood.