OpenCV >> C/C++

save avi frame to jpg

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參考資訊：
1. opencv-imwrite-not-saving-image

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})

編譯

$ cmake .
$ make

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