程式語言 - OpenCV - C/C++ - Video Processing - Save Frame to JPG

參考資訊：
https://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html

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 cap("main.avi");
    if (!cap.isOpened()) {
        printf("failed to load avi");
        return -1;
    }

    int cnt = cap.get(CAP_PROP_FRAME_COUNT);
    printf("total frame: %d\n", cnt);

    cap.set(CV_CAP_PROP_POS_FRAMES, 100);
    cap >> frame;
    imwrite("1.jpg", frame);
    waitKey(3000);
    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(main)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})