opencv 处理的视频 保存为新视频 ,新视频 无法读取

问题描述:

如题

问题原因:

其实就是保存的帧如果处理成灰度图(单通道)的话,保存为新视频,则新视频读取不了

解决办法:

处理成三通道,保存的新视频即可被读取

代码:

    VideoCapture inputVideo("/home/jason/work/01-img/红外/test.mp4");

    int width = static_cast(inputVideo.get(CAP_PROP_FRAME_WIDTH));
    int height =  static_cast(inputVideo.get(CAP_PROP_FRAME_HEIGHT));
    double fps = inputVideo.get(cv::CAP_PROP_FPS);

    VideoWriter outputVideo("/home/jason/work/01-img/红外/test_DDE.mp4",
                            VideoWriter::fourcc('m', 'p', '4', 'v'),
                            double(1000/fps),
                            cv::Size(width, height));


    Mat frame, result;
    while (true){
         inputVideo >> frame;
         if (frame.empty())
             break;

         cv::cvtColor(frame, frame, cv::COLOR_BGR2GRAY);

         DDE(frame, result);

         cv::cvtColor(result, result, cv::COLOR_GRAY2BGR);// 必须转为3通道,否则保存的新视频读取不了
         outputVideo.write(result);

         imshow("input", frame);
         imshow("output", result);

         if (waitKey(30) == 'q')
             break;
    }
    inputVideo.release();
    outputVideo.release();

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