OpenCV无损视频保存和读取

Question

我正在用EmguCV(OpenCV包装器)编写一个C#程序，我在视频中编辑像素。这些像素需要保持与我所设置的相同的值，但他们没有。例如，我设置区域100 100到105 105这些数字。83 84 65 82 84 32 76 111 114 101 109 32 105 112 115 117 109 32 100 111 108 111 114 32 115 例如，我将区域100 100设置为105 105，这些数字： START Lorem ipsum dolor s.

但当我读取这些像素时，输出的是这样的结果： 65 65 86 87 44 63 65 88 90 44 84 80 84 84 56 86 86 86 79 81 57 54 57 38 35 32 变成了胡言乱语

我需要在我的代码中修正什么才能使输出与输入相同。视频读和写。

video = new VideoCapture(op.FileName, VideoCapture.API.Ffmpeg);

noOfFrames= Convert.ToInt32(video.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameCount));
FPS = Convert.ToInt32(video.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.Fps));
playing = true;
currentFrame = 0;
Mat img = new Mat();
if(encode)
{
     vw = new VideoWriter(Directory.GetCurrentDirectory() + "\\output.mp4", FPS, new System.Drawing.Size(width, height), true);
}

while (playing== true && currentFrame < noOfFrames-1)
{
    if (noOfFrames-3 == currentFrame)
    {
        //i end it a bit quicker just in case (shouldnt matter)
        vw.Dispose();
        break;
    }

    video.Read(img);
    //img.ConvertTo(img, Emgu.CV.CvEnum.DepthType.Cv32S);
    Image<Bgra, byte> frame = new Image<Bgra, byte>(img.width, img.height);
    frame = slika.ToImage<Bgra, Byte>();

    if(encode)  
    {
        //string t = "";
        for (int i = 100; i < 105; i++)
        {
            for (int j = 100; j < 105; j++)
            {
                //MessageBox.Show(sporocilo[counter]+" ");
                if(counter<msg.Length)
                {
                    frame.Data[i, j, 0] = (byte)msg[counter];
                    frame.Data[i, j, 1] = 0;
                    frame.Data[i, j, 2] = 0;
                    counter++;
                    //t += (int)frame.Data[i, j, 0] + " ";
                }
            }
            //t += "\n";
        }
        //MessageBox.Show(t);

        Mat temp = frame.Mat;
        vw.Write(frame.Mat);
    }

    else
    {
        string t="";
        for (int i = 100; i < 105; i++)
        {
            for (int j = 100; j < 105; j++)
            {
                msg2 += (char)(frame.Data[i, j, 0]+18);
                t += (int)frame.Data[i, j, 0]+" ";
            }
            t += "\n";
        }
        MessageBox.Show(t + " " + msg2);
    }

    Bitmap bmp = frame.ToBitmap();
    original.Source = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
    currentFrame += 1;

    await Task.Delay(FPS);
}

在VideoWriter构造函数中，我缺少一个压缩参数。

vw = new VideoWriter(path, compression, FPS, size, inColor);

但是，我已经尝试了几个压缩编解码器（主要是那些有无损的写在某处的 https:/www.fourcc.org )

ASLC
CSCD
HFYU