程式語言 - MinGW - OpenCV - C/C++ - Show MP4

參考資訊：
https://stackoverflow.com/questions/13709274/reading-video-from-file-opencv

main.cpp

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace cv;
using std::string;

int main(int argc, char** argv)
{
    Mat frame;
    VideoCapture capture("main.mp4");

    if(!capture.isOpened()){
        printf("failed to load mp4");
        return -1;
    }

    namedWindow("w", 1);
    while(1){
        capture >> frame;
        if(frame.empty()){
            break;
        }
        imshow("w", frame);
        waitKey(20);
    }
    waitKey(0);
    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(main)
find_package(OpenCV REQUIRED)
include_directories("/usr/x86_64-w64-mingw32/include/opencv4")
add_executable(main main.cpp)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_aruco430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_bgsegm430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_bioinspired430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_calib3d430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_ccalib430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_core430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_datasets430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_dnn430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_dnn_objdetect430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_dnn_superres430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_dpm430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_face430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_features2d430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_flann430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_fuzzy430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_gapi430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_hfs430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_highgui430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_imgcodecs430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_img_hash430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_imgproc430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_intensity_transform430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_line_descriptor430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_ml430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_objdetect430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_optflow430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_phase_unwrapping430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_photo430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_plot430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_quality430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_rapid430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_reg430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_rgbd430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_saliency430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_shape430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_stereo430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_stitching430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_structured_light430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_superres430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_surface_matching430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_text430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_tracking430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_video430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_videoio430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_videostab430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_xfeatures2d430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_ximgproc430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_xobjdetect430.dll.a)
target_link_libraries(main /usr/x86_64-w64-mingw32/lib/libopencv_xphoto430.dll.a)

toolchain.cmake

SET(CMAKE_SYSTEM_NAME Windows)
SET(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
SET(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
SET(CMAKE_RC_COMPILER x86_64-w64-mingw32-windres)
SET(CMAKE_FIND_ROOT_PATH  /usr/x86_64-w64-mingw32)
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

編譯並且執行

$ cmake . -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake
$ make