在C#应用程序中播放树莓皮h264流

我有一个覆盆子Pi板，带有专用摄像机，只能在h264中录制视频。我正在寻找在c#windows窗体应用程序中实时流式传输和播放录制视频的最佳方法（例如，延迟不到1秒）。另外的要求是，在显示之前可以容易地处理这样的流，例如用于搜索图像上的对象

我试过的东西：

---

-raspi上的VLC服务器和c#forms应用程序中的VLC控件好的，所以实际上我设法解决了这个问题：

就像我前面说的-FPS120选项可以让玩家跳过buffer中的内容，并在收到后立即播放流。PanelId是mplayer嵌套的面板的句柄

class Mplayer
{
    Process mplayer;

    public Mplayer(string path, string pipeName, int panelId)
    {
        String args = "";
        mplayer = new Process();
        mplayer.StartInfo.UseShellExecute = false;
        mplayer.StartInfo.RedirectStandardInput = true;
        mplayer.StartInfo.FileName = path;
        args = @"\\.\pipe\" + pipeName + " -demuxer +h264es -fps 120 -nosound -cache 512";
        args += " -nofs -noquiet -identify -slave ";
        args += " -nomouseinput -sub-fuzziness 1 ";
        args += " -vo direct3d, -ao dsound  -wid ";
        args += panelId;
        mplayer.StartInfo.Arguments = args;
    }

    public void Start()
    {
        mplayer.Start();
    }

    public void End()
    {
        mplayer.Kill();
    }
}

后台工作人员正在从套接字读取内容：

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        try
        {
            pipeServ.WaitForConnection(); //opcjonalne?
            StreamWriter sw = new StreamWriter(pipeServ);
            sw.AutoFlush = true;

            tcpCamera = new TcpClient();
            tcpCamera.Connect(ipAddress, camPort);
            NetworkStream camStream = tcpCamera.GetStream();

            int read = 0;
            byte[] bytes = new byte[tcpCamera.ReceiveBufferSize];
            while (tcpCamera.Connected)
            {
                read = camStream.Read(bytes, 0, tcpCamera.ReceiveBufferSize);
                if (read > 0)
                    pipeServ.Write(bytes, 0, read);
            }
        }
        catch (IOException ex)
        {
            //Broken pipe - result of Mplayer exit
            //MessageBox.Show(ex.Message);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

在RaspberryPi上运行的脚本。Portnumber是端口rasp正在侦听的端口号

#!/bin/bash

raspivid --width 1280 --height 720 -t 9999999 --framerate 25 --output - | nc -l PORTNUMBER

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我没有使用命名管道就解决了它。以下是如何：

注意：此解决方案仅适用于Linux

首先创建一个bash脚本

VideoStreamRecv.bash

<代码>$1是WindowID的参数，我们将把WinForm面板ID传递给这个bash脚本

#!/bin/bash -e
nc 127.0.0.1 5000 | mplayer -nosound -fps 120 -demuxer h264es -cache 1024 -wid $1 -

注意：将相机连接的树莓Pi的IP写入

127.0.0.1

创建你的C#项目。我在VisualStudio中创建了一个简单的Windows窗体应用程序项目。这里是整体外观

以下是课程：

Base.cs

MPlayer.cs

这类似于@CoreMeltdown，但这里我们调用bash脚本，为了关闭mplayer子进程，我们在

End

函数中调用pkill

class MPlayer
{
    Process mplayer;

    public MPlayer(int PanelID)
    {
        mplayer = new Process();
        mplayer.StartInfo.UseShellExecute = false;
        mplayer.StartInfo.RedirectStandardInput = true;
        mplayer.StartInfo.FileName = "VideoStreamRecv.bash";
        mplayer.StartInfo.Arguments = PanelID.ToString();
    }

    public void Start()
    {
        mplayer.Start();
    }

    public void End()
    {
        mplayer.Kill();
        Process.Start("pkill mplayer");
    }
}

编译项目并将所有二进制文件和

VideoStreamRecv.bash

复制到与二进制文件相同的目录中，并将其复制到Raspberry Pi中

使用以下命令安装mono for Raspberry Pi：

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb http://download.mono-project.com/repo/debian raspbianstretch main" | sudo tee /etc/apt/sources.list.d/mono-official.list
sudo apt-get update
sudo apt-get install mono-devel --yes --allow-unauthenticated

使用此命令（与@CoreMeltdown相同）在Raspberry Pi上启动连接相机的相机流

在接收器Raspberry Pi（带有已编译二进制文件的接收器）上，打开终端，转到带有二进制文件的目录并执行：

mono MplayerFrontEnd.exe # MplayerFrontEnd is the name of my project, use your own name here.

下面是它的样子：

戴夫：D

public partial class Base : Form
{
    private MPlayer Player;
    private StreamWriter PlayerInput;
    public Base()
    {
        InitializeComponent();
    }

    private void Base_Load(object sender, EventArgs e)
    {
        Player = new MPlayer((int)Video.Handle);
        Player.Start();
    }

    private void Stop_Click(object sender, EventArgs e)
    {
        Player.End();
    }
}

class MPlayer
{
    Process mplayer;

    public MPlayer(int PanelID)
    {
        mplayer = new Process();
        mplayer.StartInfo.UseShellExecute = false;
        mplayer.StartInfo.RedirectStandardInput = true;
        mplayer.StartInfo.FileName = "VideoStreamRecv.bash";
        mplayer.StartInfo.Arguments = PanelID.ToString();
    }

    public void Start()
    {
        mplayer.Start();
    }

    public void End()
    {
        mplayer.Kill();
        Process.Start("pkill mplayer");
    }
}

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb http://download.mono-project.com/repo/debian raspbianstretch main" | sudo tee /etc/apt/sources.list.d/mono-official.list
sudo apt-get update
sudo apt-get install mono-devel --yes --allow-unauthenticated

raspivid --width 400 --height 300 -t 9999999 --framerate 25 --output - | nc -l 5000

mono MplayerFrontEnd.exe # MplayerFrontEnd is the name of my project, use your own name here.