在 GPU 空间中获取 gstreamer VideoCapture 输出

如何解决在 GPU 空间中获取 gstreamer VideoCapture 输出

下面是我的代码示例。我要返回 64 个资源。 videoCap [i] .read (frameCurrent [i]);当我说的时候，我将它输出为 Mat 输出并上传到 GpuMat。当有 64 个资源时，性能会下降。在gpu中解码后。我想将输出保留在 gpu 中，而无需在 cpu 和 gpu 之间切换。是否有可能 ？平台：Ubuntu 20.04

pipeline = filesrc location=/home/nmi/Desktop/gag/videos/480x270.mp4 ! qtdemux name=demux demux.video_0 ! h265parse ! nvh265dec ! appsink

void Widget::func_all() {

    for(int i=0; i<NUCAMS; i++){
        videoCap[i] = VideoCapture(gst_pipe[0],CAP_GSTREAMER);
    }

    std::time_t timeBegin = std::time(0);
    int tick = 0;
    long frameCounter = 0;

    namedWindow( "Output",cv::WINDOW_OPENGL );
    setWindowProperty( "Output",WND_PROP_FULLSCREEN,WINDOW_FULLSCREEN );

    while (true)
    {
        for(int i=0; i<NUCAMS; i++){
            videoCap[i].read(frameCurrent[i]);
            videoFrames[i].upload(frameCurrent[i]);
            videoFrames[i] = videoFrames[i](Rect(0,480,270));
            //cuda::resize(videoFrames[i],videoFrames[i],Size(Width,Height),INTER_AREA);
        }

        Size sizevals = videoFrames[0].size();
        int height = sizevals.height;
        int width = sizevals.width;
        sizevals.height = height * sqrt(NUCAMS);
        sizevals.width = width * sqrt(NUCAMS);
        GpuMat outval(sizevals,CV_8UC1,Scalar(0));
        //printf("types: %d %d\n",videoFrames[0].type(),outval.type());

        //cout << in1.size() << endl;
        //cout << outval.size() << endl;
        int sayac = 0;
        for(int n=0; n<sqrt(NUCAMS); n++){
            for(int m=0; m<sqrt(NUCAMS); m++)
                videoFrames[sayac++].copyTo(outval(Rect((width*m),(height*n),(width),(height))));
        }
        frameCounter++;

        std::time_t timeNow = std::time(0) - timeBegin;

        if (timeNow - tick >= 1)
        {
            tick++;
            cout << "Frames per second: " << frameCounter << endl;
            frameCounter = 0;
        }

        imshow( "Output",outval );
        if (waitKey(1) == 'q') {
            break;
        }
    }
    destroyWindow("Output");
}