1 int main(int argc, const char* argv[])
 2 {
 3     if (argc != 2)
 4     {
 5         std::cerr << "Usage : video_writer <input video file>" << std::endl;
 6         return -1;
 7     }
 8 
 9     const double FPS = 25.0;
10     cv::VideoCapture reader(argv[1]);
11 
12     if (!reader.isOpened())
13     {
14         std::cerr << "Can‘t open input video file" << std::endl;
15         return -1;
16     }
17 
18     cv::gpu::printShortCudaDeviceInfo(cv::gpu::getDevice());
19     cv::gpu::VideoWriter_GPU d_writer;
20 
21     cv::Mat frame;
22     cv::gpu::GpuMat d_frame;
23 
24     for (int i = 1;; ++i)
25     {
26         std::cout << "Read " << i << " frame" << std::endl;
27         reader >> frame;
28         if (frame.empty())
29         {
30             std::cout << "Stop" << std::endl;
31             break;
32         }
33         cv::resize(frame,frame,cv::Size(704,576));
34         if (!d_writer.isOpened())
35         {
36             std::cout << "Open GPU Writer" << std::endl;
37 
38             d_writer.open("output_gpu.avi", frame.size(), FPS);
39         }
40         d_frame.upload(frame);
41         std::cout << "Write " << i << " frame" << std::endl;
42         d_writer.write(d_frame);
43     }
44     return 0;
45 }