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Error: undefined reference to `cvReleaseImage' (opencv + Qt)

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  • SGaistS SGaist

    Hi and welcome to devnet,

    Do you have OpenCV built for the correct architecture ?
    Is it built with MinGW ?

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by mrjj
    #14

    @SGaist

    Hi
    The video contains links to a Qt build version it seems. ( 3rd link in the text below)
    But its for 5.4 ( and seems to contain virus/unclean ) so I could not check what
    was actually inside.

    and it seems the poster is using
    Qt5.12.11 so I guess that is why it won't link.

    @Negar_mg

    I think you might have better luck with
    https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows
    The other video is using something that is really old.

    Unless it must be Qt 54. ofc. even if very, very old.

    1 Reply Last reply
    0
    • Negar_mgN Offline
      Negar_mgN Offline
      Negar_mg
      wrote on last edited by Negar_mg
      #15

      i am using
      Qt5.12.11 ,
      OpenCV-2.4.9- Qt 5.4,
      opencv-4.5.2-vc14_vc15
      windows10

      i did that link's steps but i have some errors in cmake.
      this is logs:

      {
      sizeof(void) = 4 on 64 bit processor. Assume 32-bit compilation mode
      Found PythonInterp: C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe (found suitable version "3.7", minimum required is "2.7")
      CMake Warning at cmake/OpenCVDetectPython.cmake:81 (message):
      CMake's 'find_host_package(PythonInterp 2.7)' found wrong Python version:

      PYTHON_EXECUTABLE=C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe

      PYTHON_VERSION_STRING=3.7

      Consider providing the 'PYTHON2_EXECUTABLE' variable via CMake command line
      or environment variables

      Call Stack (most recent call first):
      cmake/OpenCVDetectPython.cmake:271 (find_python)
      CMakeLists.txt:614 (include)

      Could NOT find Python2 (missing: Python2_EXECUTABLE Interpreter)
      Reason given by package:
      Interpreter: Wrong major version for the interpreter "C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe"

      }

      {
      Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH - Failed
      Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
      VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
      ADE: Download: v0.1.1f.zip
      Try 1 failed
      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
      ADE: Download failed: 35;"SSL connect error"

      For details please refer to the download log file:

      C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt

      Call Stack (most recent call first):
      modules/gapi/cmake/DownloadADE.cmake:5 (ocv_download)
      modules/gapi/cmake/init.cmake:19 (include)
      cmake/OpenCVModule.cmake:298 (include)
      cmake/OpenCVModule.cmake:361 (_add_modules_1)
      modules/CMakeLists.txt:7 (ocv_glob_modules)

      OpenCV Python: during development append to PYTHONPATH: C:/Qt/opencv_cv2/opencv/release/python_loader
      Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
      FFMPEG: Download: opencv_videoio_ffmpeg.dll
      Try 1 failed
      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
      FFMPEG: Download failed: 35;"SSL connect error"

      For details please refer to the download log file:

      C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt

      Call Stack (most recent call first):
      3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
      modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
      modules/videoio/cmake/init.cmake:7 (include)
      modules/videoio/cmake/init.cmake:18 (add_backend)
      cmake/OpenCVModule.cmake:298 (include)
      cmake/OpenCVModule.cmake:361 (_add_modules_1)
      modules/CMakeLists.txt:7 (ocv_glob_modules)

      FFMPEG: Download: opencv_videoio_ffmpeg_64.dll
      Try 1 failed
      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
      FFMPEG: Download failed: 35;"SSL connect error"

      For details please refer to the download log file:

      C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt

      Call Stack (most recent call first):
      3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
      modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
      modules/videoio/cmake/init.cmake:7 (include)
      modules/videoio/cmake/init.cmake:18 (add_backend)
      cmake/OpenCVModule.cmake:298 (include)
      cmake/OpenCVModule.cmake:361 (_add_modules_1)
      modules/CMakeLists.txt:7 (ocv_glob_modules)

      FFMPEG: Download: ffmpeg_version.cmake
      Try 1 failed
      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
      FFMPEG: Download failed: 35;"SSL connect error"

      For details please refer to the download log file:

      C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt

      Call Stack (most recent call first):
      3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
      modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
      modules/videoio/cmake/init.cmake:7 (include)
      modules/videoio/cmake/init.cmake:18 (add_backend)
      cmake/OpenCVModule.cmake:298 (include)
      cmake/OpenCVModule.cmake:361 (_add_modules_1)
      modules/CMakeLists.txt:7 (ocv_glob_modules)

      }

      {
      Performing Test HAVE_CXX_WNO_UNUSED_PRIVATE_FIELD - Failed
      CMake Warning at cmake/OpenCVGenSetupVars.cmake:54 (message):
      CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install
      directory
      Call Stack (most recent call first):
      CMakeLists.txt:1010 (include)

      }

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #16

        What exactly are you trying to build ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        1 Reply Last reply
        0
        • Negar_mgN Offline
          Negar_mgN Offline
          Negar_mg
          wrote on last edited by
          #17

          I want to write a program to display an image or video from a webcam using Qt and Open CV.
          But I was not able to add Open CV to QT. When I used the following link, I encountered those errors in CMake.
          /................................................................................................
          https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows
          /...............................................................................................
          And when I used the link from YouTube that I sent in the first comment, I encountered those errors in Qt.

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #18

            From the looks of it, the OpenCV 4 you downloaded is built with Visual Studio, thus you have to use a Visual Studio build of Qt as well as mixing C++ compilers is not possible.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            1 Reply Last reply
            0
            • Negar_mgN Offline
              Negar_mgN Offline
              Negar_mg
              wrote on last edited by
              #19

              You mean you think I can not use opencv with Qt?
              Is there no way?

              jsulmJ 1 Reply Last reply
              0
              • Negar_mgN Negar_mg

                You mean you think I can not use opencv with Qt?
                Is there no way?

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #20

                @Negar_mg said in Error: undefined reference to `cvReleaseImage' (opencv + Qt):

                You mean you think I can not use opencv with Qt?

                No, that's not what @SGaist means.
                What he means is that you can't mix binaries built with different C++ compilers.
                And because OpenCV you downloaded was built using compiler from Microsoft Visual Studio you also need Qt built with this compiler. So, simply install MSVC2017 or MSVC2019 Qt.

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                1 Reply Last reply
                2
                • Negar_mgN Offline
                  Negar_mgN Offline
                  Negar_mg
                  wrote on last edited by
                  #21

                  thanks alot :)

                  1 Reply Last reply
                  0
                  • Negar_mgN Offline
                    Negar_mgN Offline
                    Negar_mg
                    wrote on last edited by
                    #22

                    If I understand correctly, there are 2 ways to solve this issue:

                    1- use vc compiler in qt to compile my codes.

                    Here is a link I found for that, please let me know if it is correct:

                    https://stackoverflow.com/questions/47773289/debugging-in-qtcreator-using-msvc2017-compiler

                    2- download and compile opencv using qt compiler, and then refering to that folder in my qt.
                    Is this compiler called minWG?
                    Please give me a link or instruction on how to do that.

                    jsulmJ 1 Reply Last reply
                    0
                    • Negar_mgN Negar_mg

                      If I understand correctly, there are 2 ways to solve this issue:

                      1- use vc compiler in qt to compile my codes.

                      Here is a link I found for that, please let me know if it is correct:

                      https://stackoverflow.com/questions/47773289/debugging-in-qtcreator-using-msvc2017-compiler

                      2- download and compile opencv using qt compiler, and then refering to that folder in my qt.
                      Is this compiler called minWG?
                      Please give me a link or instruction on how to do that.

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #23

                      @Negar_mg said in Error: undefined reference to `cvReleaseImage' (opencv + Qt):

                      Is this compiler called minWG?

                      I don't know what compiler you are using. This is something you should know.

                      To use Visual Studio compiler you first need to install Visual Studio together with C++ tools. You can use the free Community edition. Then install Qt for that Visual Studio version. Then you should have a Kit in QtCreator configured to use Visual Studio compiler. The link you posted looks legit, just download more recent Qt version.

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                      1 Reply Last reply
                      0
                      • Negar_mgN Offline
                        Negar_mgN Offline
                        Negar_mg
                        wrote on last edited by
                        #24

                        I do not need vs and i have uninstalled it
                        But i still get the error mentioned above
                        How can i install opencv on qt without visual studio?

                        jsulmJ 1 Reply Last reply
                        0
                        • Negar_mgN Negar_mg

                          I do not need vs and i have uninstalled it
                          But i still get the error mentioned above
                          How can i install opencv on qt without visual studio?

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by
                          #25

                          @Negar_mg Build OpenCV using the compiler you're using with Qt...
                          @mrjj Already gave you a link: https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows
                          Also there is official OpenCV documentation for that: https://docs.opencv.org/3.4/d3/d52/tutorial_windows_install.html

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                          1 Reply Last reply
                          1
                          • Negar_mgN Offline
                            Negar_mgN Offline
                            Negar_mg
                            wrote on last edited by
                            #26

                            I have followed the steps in the link you provided, but cmake step raised some errors. Its log is bellow:

                            Log:
                            {sizeof(void) = 4 on 64 bit processor. Assume 32-bit compilation mode
                            Found PythonInterp: C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe (found suitable version "3.7", minimum required is "2.7")
                            CMake Warning at cmake/OpenCVDetectPython.cmake:81 (message):
                            CMake's 'find_host_package(PythonInterp 2.7)' found wrong Python version:
                            PYTHON_EXECUTABLE=C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe
                            PYTHON_VERSION_STRING=3.7
                            Consider providing the 'PYTHON2_EXECUTABLE' variable via CMake command line
                            or environment variables
                            Call Stack (most recent call first):
                            cmake/OpenCVDetectPython.cmake:271 (find_python)
                            CMakeLists.txt:614 (include)
                            Could NOT find Python2 (missing: Python2_EXECUTABLE Interpreter)
                            Reason given by package:
                            Interpreter: Wrong major version for the interpreter "C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe"
                            }
                            //..............................
                            {
                            Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH - Failed
                            Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
                            VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
                            ADE: Download: v0.1.1f.zip
                            Try 1 failed
                            CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                            ADE: Download failed: 35;"SSL connect error"
                            For details please refer to the download log file:
                            C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt
                            Call Stack (most recent call first):
                            modules/gapi/cmake/DownloadADE.cmake:5 (ocv_download)
                            modules/gapi/cmake/init.cmake:19 (include)
                            cmake/OpenCVModule.cmake:298 (include)
                            cmake/OpenCVModule.cmake:361 (_add_modules_1)
                            modules/CMakeLists.txt:7 (ocv_glob_modules)
                            OpenCV Python: during development append to PYTHONPATH: C:/Qt/opencv_cv2/opencv/release/python_loader
                            Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
                            FFMPEG: Download: opencv_videoio_ffmpeg.dll
                            Try 1 failed
                            CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                            FFMPEG: Download failed: 35;"SSL connect error"
                            For details please refer to the download log file:
                            C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt
                            Call Stack (most recent call first):
                            3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
                            modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
                            modules/videoio/cmake/init.cmake:7 (include)
                            modules/videoio/cmake/init.cmake:18 (add_backend)
                            cmake/OpenCVModule.cmake:298 (include)
                            cmake/OpenCVModule.cmake:361 (_add_modules_1)
                            modules/CMakeLists.txt:7 (ocv_glob_modules)
                            FFMPEG: Download: opencv_videoio_ffmpeg_64.dll
                            Try 1 failed
                            CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                            FFMPEG: Download failed: 35;"SSL connect error"
                            For details please refer to the download log file:
                            C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt
                            Call Stack (most recent call first):
                            3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
                            modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
                            modules/videoio/cmake/init.cmake:7 (include)
                            modules/videoio/cmake/init.cmake:18 (add_backend)
                            cmake/OpenCVModule.cmake:298 (include)
                            cmake/OpenCVModule.cmake:361 (_add_modules_1)
                            modules/CMakeLists.txt:7 (ocv_glob_modules)
                            FFMPEG: Download: ffmpeg_version.cmake
                            Try 1 failed
                            CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                            FFMPEG: Download failed: 35;"SSL connect error"
                            For details please refer to the download log file:
                            C:/Qt/opencv_cv2/opencv/release/CMakeDownloadLog.txt
                            Call Stack (most recent call first):
                            3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
                            modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
                            modules/videoio/cmake/init.cmake:7 (include)
                            modules/videoio/cmake/init.cmake:18 (add_backend)
                            cmake/OpenCVModule.cmake:298 (include)
                            cmake/OpenCVModule.cmake:361 (_add_modules_1)
                            modules/CMakeLists.txt:7 (ocv_glob_modules)
                            }
                            //........................................
                            {
                            Performing Test HAVE_CXX_WNO_UNUSED_PRIVATE_FIELD - Failed
                            CMake Warning at cmake/OpenCVGenSetupVars.cmake:54 (message):
                            CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install
                            directory
                            Call Stack (most recent call first):
                            CMakeLists.txt:1010 (include)
                            }

                            1 Reply Last reply
                            0
                            • mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #27

                              Hi
                              Could you try with python 2.7 instead?

                              It seems to complain about the 3.7 version

                              CMake's 'find_host_package(PythonInterp 2.7)' found wrong Python version:
                              Could NOT find Python2 (missing: Python2_EXECUTABLE Interpreter)
                              Wrong major version for the interpreter "C:/Users/test/AppData/Local/Programs/Python/Python37/python.exe"

                              1 Reply Last reply
                              0
                              • Negar_mgN Offline
                                Negar_mgN Offline
                                Negar_mg
                                wrote on last edited by
                                #28

                                How can i try it with python 2.7? What should i change in tutorial steps?

                                jsulmJ mrjjM 2 Replies Last reply
                                0
                                • Negar_mgN Negar_mg

                                  How can i try it with python 2.7? What should i change in tutorial steps?

                                  jsulmJ Offline
                                  jsulmJ Offline
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #29

                                  @Negar_mg You should install Python 2.7

                                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                                  1 Reply Last reply
                                  0
                                  • Negar_mgN Negar_mg

                                    How can i try it with python 2.7? What should i change in tutorial steps?

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #30

                                    @Negar_mg

                                    All steps the same.
                                    Simply install python 2.7 and see if it then
                                    sounds happier

                                    1 Reply Last reply
                                    0
                                    • Negar_mgN Offline
                                      Negar_mgN Offline
                                      Negar_mg
                                      wrote on last edited by
                                      #31

                                      I installed Python 2.7, checked that it was installed with the python -v command in cmd, then according to this link

                                      //...........................................................................................

                                      https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows
                                      //...........................................................................................
                                      In cmake, I selected the source and destination, but after clicking the configure button, I encountered these errors:
                                      //...........................................................................................
                                      {
                                      Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH - Failed
                                      Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
                                      VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
                                      ADE: Download: v0.1.1f.zip
                                      Try 1 failed
                                      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                                      ADE: Download failed: 35;"SSL connect error"

                                      For details please refer to the download log file:

                                      C:/Qt/opencv_cv2/opencv/Release/CMakeDownloadLog.txt

                                      Call Stack (most recent call first):
                                      modules/gapi/cmake/DownloadADE.cmake:5 (ocv_download)
                                      modules/gapi/cmake/init.cmake:19 (include)
                                      cmake/OpenCVModule.cmake:298 (include)
                                      cmake/OpenCVModule.cmake:361 (_add_modules_1)
                                      modules/CMakeLists.txt:7 (ocv_glob_modules)

                                      OpenCV Python: during development append to PYTHONPATH: C:/Qt/opencv_cv2/opencv/Release/python_loader
                                      Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
                                      FFMPEG: Download: opencv_videoio_ffmpeg.dll
                                      Try 1 failed
                                      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                                      FFMPEG: Download failed: 35;"SSL connect error"

                                      For details please refer to the download log file:

                                      C:/Qt/opencv_cv2/opencv/Release/CMakeDownloadLog.txt

                                      Call Stack (most recent call first):
                                      3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
                                      modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
                                      modules/videoio/cmake/init.cmake:7 (include)
                                      modules/videoio/cmake/init.cmake:18 (add_backend)
                                      cmake/OpenCVModule.cmake:298 (include)
                                      cmake/OpenCVModule.cmake:361 (_add_modules_1)
                                      modules/CMakeLists.txt:7 (ocv_glob_modules)

                                      FFMPEG: Download: opencv_videoio_ffmpeg_64.dll
                                      Try 1 failed
                                      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                                      FFMPEG: Download failed: 35;"SSL connect error"

                                      For details please refer to the download log file:

                                      C:/Qt/opencv_cv2/opencv/Release/CMakeDownloadLog.txt

                                      Call Stack (most recent call first):
                                      3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
                                      modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
                                      modules/videoio/cmake/init.cmake:7 (include)
                                      modules/videoio/cmake/init.cmake:18 (add_backend)
                                      cmake/OpenCVModule.cmake:298 (include)
                                      cmake/OpenCVModule.cmake:361 (_add_modules_1)
                                      modules/CMakeLists.txt:7 (ocv_glob_modules)

                                      FFMPEG: Download: ffmpeg_version.cmake
                                      Try 1 failed
                                      CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
                                      FFMPEG: Download failed: 35;"SSL connect error"

                                      For details please refer to the download log file:

                                      C:/Qt/opencv_cv2/opencv/Release/CMakeDownloadLog.txt

                                      Call Stack (most recent call first):
                                      3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
                                      modules/videoio/cmake/detect_ffmpeg.cmake:14 (download_win_ffmpeg)
                                      modules/videoio/cmake/init.cmake:7 (include)
                                      modules/videoio/cmake/init.cmake:18 (add_backend)
                                      cmake/OpenCVModule.cmake:298 (include)
                                      cmake/OpenCVModule.cmake:361 (_add_modules_1)
                                      modules/CMakeLists.txt:7 (ocv_glob_modules)

                                      }

                                      1 Reply Last reply
                                      0
                                      • Negar_mgN Offline
                                        Negar_mgN Offline
                                        Negar_mg
                                        wrote on last edited by Negar_mg
                                        #32

                                        @mrjj ,
                                        @SGaist
                                        Please Help me ,
                                        How can I fix these errors?

                                        jsulmJ 1 Reply Last reply
                                        0
                                        • Negar_mgN Negar_mg

                                          @mrjj ,
                                          @SGaist
                                          Please Help me ,
                                          How can I fix these errors?

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #33

                                          @Negar_mg I don't know how. This is an OpenCV issue and has nothing to do with Qt. Please ask in an OpenCV forum.

                                          You should at least consider doing what the error output suggests:
                                          "For details please refer to the download log file:

                                          C:/Qt/opencv_cv2/opencv/Release/CMakeDownloadLog.txt"
                                          It looks like it can't download some dependencies.

                                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                                          1 Reply Last reply
                                          0

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