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• Receiving UDP streams on my web server

  25 novembre 2013, par user3032143

  I have a Winform C# Desktop application.

  This is my overall aim :

  I have a constant stream of images from which I acquire using a VLC wrapper receiving a RTSP stream from my IP camera.

  I am doing image processing on these separate jpegs and at the same time I am wanting to upload these jpegs to my web server so my User can view these streaming jpegs live a video.

  Now, I have accomplished this so far by uploading each jpeg to my server using a [Web method]. But, I am trying to push my knowledge to make it more efficient.

  Now, i know if I use a video encoder - like OGG (used because it is Open Source) I can use ffmpeg called from my client code using the Process class so to convert images to that video format.

  Doing this saves a lot of memory when comparing that 1 ogg file to the separate bytes added up in total from all the individual jpegs.

  These are the arguments I pass to ffmpeg to achieve that :

  -f image2 -r 10 -i {location of jpegs}+"\img%05d.jpg -crf 23  -y -r 10 -f outputfile.ogg

  Now, I could take this a step further and not output to a physical file but instead to the base stream of the Process class. I would use these arguments to accomplish that :

  -f image2 -r 10 -i {location of jpegs}+"\img%05d.jpg -crf 23  -y -r 10 -f ogg -

  and in my code I would get the memory stream like so :

  mStandardOutput = serverBuild.StandardOutput.BaseStream;
  
  mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
  serverBuild.WaitForExit();
  
  data = mStandardOutputMs.ToArray();
  
  mStandardOutput.Close();

  Now ultimately, I would like to replace :

  -i {location of jpegs}+"\img%05d.jpg

  with a constant flow of jpegs in a memory stream like so :

  ffmpeg -f mjpeg -i - -r 10 -c:v libtheora -q:v 7 -f ogg -

  .. by over-writing the stdin...

  But I have not done this yet because I want to 1st try getting the ogg to be received within my web server.

  From there I would extract the jpegs to be accessible somehow via my web application written in asp.net 4.0.

  But first thing is first I want to just see if I can receive the UDP stream from my client.
  So, I create a test C# application to open and listen write from the client stream..
  this is my code :

  Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
  
  public Form1()
  
  {
  
     InitializeComponent();
  
  
  
     socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
  
     string ip = "My Server IP Address";
  
     int port = 3000;
  
     socket.Bind(new IPEndPoint(IPAddress.Parse(ip), port));
  
  }
  
  
  
  private void button1_Click(object sender, EventArgs e)
  
  {
  
     try
  
     {
  
        var buffer = new byte[1024];
  
        while (true)
  
        {
  
           Application.DoEvents();
  
           int numBytesReceived = socket.Receive(buffer);
  
           if (numBytesReceived > 0)
  
           {
  
              File.WriteAllBytes("c:\\udp\\test.ogg", buffer);
  
           }
  
        }
  
     }
  
     catch (Exception _ex)
  
     {
  
        MessageBox.Show(_ex.ToString());
  
     }
  
  }

  But, I get this error :

  A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram into was smaller than the datagram itself.

  What am I doing wrong please ?

  Thanks

• Streaming jpegs to a video on my server

  2 décembre 2013, par Andrew Simpson

  I found a solution to my problem IF I was using a Linux/UNIX machine. It is FFServer from the tools from FFMPEG.

  I had been using FFMPEG on my client Winform Desktop C# to convert jpegs into an OGG video file for playback.

  I have now been tasked with uploading the jpegs to my server and rendering it as a video.

  Optimum, I would start an FFMPEG process on my client PC and supply its stdin with jpegs in byte array format. I have achieved this (I have looked around) but is there a way to redirect the stdoutput to my server that can be picked up by my code on the server and render in real-time to my web User ?

  I have looked on the ffmpeg web site but I am unsure how to 'fit' it in with my process.

  This is my code so far :

      public byte[] EncodeAndUploadImages(string _args1, string _fn)  
  
      {
  
          byte[] _data = null;
  
          try
  
          {
  
              clientBuild = new Process();
  
              clientBuild.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
  
              clientBuild.StartInfo.Arguments = " -f mjpeg -r 30 -i - -c:v libtheora -q:v 7 -r 30 -f ogg -";
  
              clientBuild.StartInfo.FileName = Environment.CurrentDirectory + @"\ffmpeg.exe";
  
              clientBuild.StartInfo.UseShellExecute = false;
  
              clientBuild.StartInfo.RedirectStandardOutput = true;
  
              clientBuild.StartInfo.RedirectStandardError = true;
  
              clientBuild.StartInfo.RedirectStandardInput = true;
  
              clientBuild.StartInfo.CreateNoWindow = true;
  
              clientBuild.StartInfo.LoadUserProfile = false;
  
              clientBuild.EnableRaisingEvents = true;    
  
              clientBuild.Start();
  
  
  
              using (BinaryWriter bw = new BinaryWriter(clientBuild.StandardInput.BaseStream))
  
              {
  
                 //I am simulating a stream of jpegs coming in////////////////
  
                  for (int i = 1; i < 20; i++)
  
                  {
  
                      using (MemoryStream ms = new MemoryStream())
  
                      {
  
                          System.Diagnostics.Debug.Write(i.ToString("00000"));
  
                          Bitmap bmp = new Bitmap("h:\\streamin\\" + i.ToString("00000") + ".jpg");
  
                          bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
  
                          bw.Write(ms.ToArray());                           
  
                          bmp.Dispose();
  
                          ms.Close();
  
                      }
  
                  }
  
                  bw.Close();
  
              }
  
  
  
              // I need some in my ffmpeg arguments to do something here//////   
  
              mStandardOutput = clientBuild.StandardOutput.BaseStream;
  
              mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
              clientBuild.WaitForExit();
  
              _data = mStandardOutputMs.ToArray();
  
              mStandardOutput.Close();
  
          }
  
          catch (Exception _ex)
  
          {
  
  
  
          }
  
          finally
  
          {
  
              clientBuild.Dispose();
  
          }
  
          return _data;
  
      }

  Thanks

• Is it possible to record video/audio without xuggler and ffmpeg in java applet without server side

  9 janvier 2014, par user2406481

  I have made Java Screen recorder applet like screenr.com

  Is it possible to record video/audio without xuggler and ffmpeg in java applet without server side

  I cannot use xuggler as it has 40 mb and takes tool long time for loading

  I need .mp4 videos export only