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

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  • R Offline
    R Offline
    RodMckay
    wrote on last edited by
    #10

    thanks for your reply but it doesn't show again , I'm tired to try that

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #11

      Use cvWaitKey(-1) so it won't timeout, also you should check whether opencv needs windows style path e.g.

      @IplImage* img = cvLoadImage("D:\image.jpg");@

      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
        #12

        Hi,
        I followed this tutorial:
        https://www.youtube.com/watch?v=ox6NFWE8xg4

        this is my .pro file:

        QT -= gui

        CONFIG += c++11 console
        CONFIG -= app_bundle

        SOURCES +=
        main.cpp

        qnx: target.path = /tmp/$${TARGET}/bin
        else: unix:!android: target.path = /opt/$${TARGET}/bin
        !isEmpty(target.path): INSTALLS += target
        INCLUDEPATH += C:\Qt\opencv_cv2\OPENCV1\include
        LIBS += -LC:\Qt\opencv_cv2\OPENCV1\build-qt\lib
        -lopencv_calib3d249d
        -lopencv_contrib249d
        -lopencv_core249d
        -lopencv_features2d249d
        -lopencv_flann249d
        -lopencv_gpu249d
        -lopencv_highgui249d
        -lopencv_imgproc249d
        -lopencv_legacy249d
        -lopencv_ml249d
        -lopencv_nonfree249d
        -lopencv_objdetect249d
        -lopencv_ocl249d
        -lopencv_photo249d
        -lopencv_stitching249d
        -lopencv_superres249d
        -lopencv_ts249d
        -lopencv_video249d
        -lopencv_videostab249d

        this is my main file:

        #include <iostream>

        #include <opencv2/highgui/highgui.hpp>
        #include <opencv2/imgproc/imgproc.hpp>
        #include <opencv2/core/core.hpp>

        using namespace cv;
        using namespace std;

        int main()
        {
        string imgloc="D:/ide/111.png";

        Mat image = imread(imgloc);
        

        // Check for failure
        if (image.empty())
        {
        cout << "Could not open or find the image" << endl;
        return -1;
        }

        String windowName = "opencv"; //Name of the window
        
        namedWindow(windowName); // Create a window
        
        imshow(windowName, image); // Show our image inside the created window.
        
        waitKey(0); // Wait for any keystroke in the window
        
        
        return 0;
        

        }

        and this is my log output:

        14:38:00: Running steps for project opencvtest10...
        14:38:00: Starting: "C:\Qt\Qt5.12.11\5.12.11\mingw73_32\bin\qmake.exe" C:\Users\test\Documents\opencvtest10\opencvtest10.pro -spec win32-g++ "CONFIG+=debug" "CONFIG+=qml_debug"
        Info: creating stash file C:\Users\test\Documents\build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug.qmake.stash
        14:38:04: The process "C:\Qt\Qt5.12.11\5.12.11\mingw73_32\bin\qmake.exe" exited normally.
        14:38:04: Starting: "C:\Qt\Qt5.12.11\Tools\mingw730_32\bin\mingw32-make.exe" -f C:/Users/test/Documents/build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug/Makefile qmake_all
        mingw32-make: Nothing to be done for 'qmake_all'.
        14:38:05: The process "C:\Qt\Qt5.12.11\Tools\mingw730_32\bin\mingw32-make.exe" exited normally.
        14:38:05: Starting: "C:\Qt\Qt5.12.11\Tools\mingw730_32\bin\mingw32-make.exe" -j4
        C:/Qt/Qt5.12.11/Tools/mingw730_32/bin/mingw32-make -f Makefile.Debug
        mingw32-make[1]: Entering directory 'C:/Users/test/Documents/build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug'
        g++ -c -fno-keep-inline-dllexport -g -std=gnu++11 -Wall -W -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_QML_DEBUG -DQT_CORE_LIB -I..\opencvtest10 -I. -I........\Qt\opencv_cv2\OPENCV1\include -I........\Qt\Qt5.12.11\5.12.11\mingw73_32\include -I........\Qt\Qt5.12.11\5.12.11\mingw73_32\include\QtCore -Idebug -I........\Qt\Qt5.12.11\5.12.11\mingw73_32\mkspecs\win32-g++ -o debug\main.o ..\opencvtest10\main.cpp
        g++ -Wl,-subsystem,console -mthreads -o debug\opencvtest10.exe debug/main.o -LC:\Qt\opencv_cv2\OPENCV1\build-qt\lib -lopencv_calib3d249d -lopencv_contrib249d -lopencv_core249d -lopencv_features2d249d -lopencv_flann249d -lopencv_gpu249d -lopencv_highgui249d -lopencv_imgproc249d -lopencv_legacy249d -lopencv_ml249d -lopencv_nonfree249d -lopencv_objdetect249d -lopencv_ocl249d -lopencv_photo249d -lopencv_stitching249d -lopencv_superres249d -lopencv_ts249d -lopencv_video249d -lopencv_videostab249d C:\Qt\Qt5.12.11\5.12.11\mingw73_32\lib\libQt5Cored.a
        debug/main.o: In function main': C:\Users\test\Documents\build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug/../opencvtest10/main.cpp:14: undefined reference to cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
        C:\Users\test\Documents\build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug/../opencvtest10/main.cpp:25: undefined reference to cv::namedWindow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)' C:\Users\test\Documents\build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug/../opencvtest10/main.cpp:27: undefined reference to cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'
        collect2.exe: error: ld returned 1 exit status
        mingw32-make[1]: *** [Makefile.Debug:65: debug/opencvtest10.exe] Error 1
        mingw32-make: *** [Makefile:38: debug] Error 2
        mingw32-make[1]: Leaving directory 'C:/Users/test/Documents/build-opencvtest10-Desktop_Qt_5_12_11_MinGW_32_bit-Debug'
        14:38:13: The process "C:\Qt\Qt5.12.11\Tools\mingw730_32\bin\mingw32-make.exe" exited with code 2.
        Error while building/deploying project opencvtest10 (kit: Desktop Qt 5.12.11 MinGW 32-bit)
        When executing step "Make"
        14:38:13: Elapsed time: 00:13.

        is there anyone who knows solution of this problems ? thanks for replies

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #13

          Hi and welcome to devnet,

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

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

          mrjjM 1 Reply Last reply
          1
          • 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 &#x60;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 &#x60;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)
                                    }

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                                    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"

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                                      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

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                                          0

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