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#include <iostream>
#include "opencv2/opencv_modules.hpp"
#if defined(HAVE_OPENCV_CUDACODEC)
#include <vector>
#include <numeric>
#include "opencv2/core.hpp"
#include "opencv2/cudacodec.hpp"
#include "opencv2/highgui.hpp"
using namespace cv;
int main(int argc, const char* argv[])
{
if (argc != 2)
{
std::cerr << "Usage : video_writer <input video file>" << std::endl;
return -1;
}
constexpr double fps = 25.0;
cv::VideoCapture reader(argv[1]);
if (!reader.isOpened())
{
std::cerr << "Can't open input video file" << std::endl;
return -1;
}
cv::cuda::printShortCudaDeviceInfo(cv::cuda::getDevice());
cv::VideoWriter writer;
cv::Ptr<cv::cudacodec::VideoWriter> d_writer;
cv::Mat frame;
cv::cuda::GpuMat d_frame;
cv::cuda::Stream stream;
for (int i = 1;; ++i)
{
std::cout << "Read " << i << " frame" << std::endl;
reader >> frame;
if (frame.empty())
{
std::cout << "Stop" << std::endl;
break;
}
if (!writer.isOpened())
{
std::cout << "Frame Size : " << frame.cols << "x" << frame.rows << std::endl;
std::cout << "Open CPU Writer" << std::endl;
const String outputFilename = "output_cpu.avi";
if (!writer.open(outputFilename, cv::VideoWriter::fourcc('X', 'V', 'I', 'D'), fps, frame.size()))
return -1;
std::cout << "Writing to " << outputFilename << std::endl;
}
if (d_writer.empty())
{
std::cout << "Open CUDA Writer" << std::endl;
const cv::String outputFilename = "output_gpu.h264";
d_writer = cv::cudacodec::createVideoWriter(outputFilename, frame.size(), cv::cudacodec::Codec::H264, fps, cv::cudacodec::ColorFormat::BGR, 0, stream);
std::cout << "Writing to " << outputFilename << std::endl;
}
d_frame.upload(frame, stream);
std::cout << "Write " << i << " frame" << std::endl;
writer.write(frame);
d_writer->write(d_frame);
}
return 0;
}
#else
int main()
{
std::cout << "OpenCV was built without CUDA Video encoding support\n" << std::endl;
return 0;
}
#endif
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