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• Concurrently redirect Process stdin and stdout in Process Class

  3 décembre 2013, par Andrew Simpson

  I have a desktop application written in C#.

  I am using ffmpeg using the Process class.

  Currently there are 2 stages in my code.

  The first is that I supply byte arrays (each array is a jpeg) to the stdin to create an ogg file.

  This is the code for that :

     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))
  
              {
  
                  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();
  
              }
  
  
  
              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;
  
      }

  The stdout gives me that ogg file in a new byte array.

  The second part of my code takes a ogg file on my hard disk and extracts all the jpegs contained init to stdout in byte array format.

  Here is that code :

     private void ExtractImagesFromVideo(byte[] data,string _args)
  
      {
  
          try
  
          {
  
              build = new Process();
  
              build = new Process();
  
              build.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
  
              build.StartInfo.Arguments =  "-i \"h:\\streamout\\cache.ogg\" -vf scale=640:-1 -an -vframes 100 -r 1 -f image2pipe -";
  
              build.StartInfo.FileName = @"C:\inetpub\wwwroot\bin\ffmpeg.exe";
  
              build.StartInfo.UseShellExecute = false;
  
              build.StartInfo.RedirectStandardOutput = true;
  
              build.StartInfo.RedirectStandardError = true;
  
              build.StartInfo.RedirectStandardInput = true;
  
              build.StartInfo.CreateNoWindow = true;
  
              build.StartInfo.LoadUserProfile = false;
  
              build.EnableRaisingEvents = true;    
  
              build.Start();
  
  
  
  
  
              mStandardOutput = build.StandardOutput.BaseStream;
  
              mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
              build.WaitForExit();
  
              byte[] _data5 = mStandardOutputMs.ToArray();
  
              mStandardOutput.Close();
  
          }
  
          catch (Exception _ex)
  
          {
  
  
  
          }
  
          finally
  
          {
  
              build.Dispose();
  
          }
  
      }

  Now I would like to fuse the 2 processes. The ultimate aim is to supply stdin from a ogg file in byte array format and to extract the contaomed jpegs in byte array format.

  But if i do this :

     private void ExtractImagesFromVideo(byte[] data,string _args)
  
      {
  
          try
  
          {
  
              build = new Process();
  
              build = new Process();
  
              build.StartInfo.WorkingDirectory = Environment.CurrentDirectory;
  
              build.StartInfo.Arguments = "-i pipe:0 -vf scale=640:-1 -an -vframes 100 -r 1 -f image2pipe -";
  
              build.StartInfo.FileName = @"C:\inetpub\wwwroot\bin\ffmpeg.exe";
  
              build.StartInfo.UseShellExecute = false;
  
              build.StartInfo.RedirectStandardOutput = true;
  
              build.StartInfo.RedirectStandardError = true;
  
              build.StartInfo.RedirectStandardInput = true;
  
              build.StartInfo.CreateNoWindow = true;
  
              build.StartInfo.LoadUserProfile = false;
  
              build.EnableRaisingEvents = true;    
  
              build.Start();
  
  
  
  
  
              using (BinaryWriter bw = new BinaryWriter(build.StandardInput.BaseStream))
  
              {
  
                  bw.Write(data);  //code hangs here!!!!
  
              }
  
  
  
              mStandardOutput = build.StandardOutput.BaseStream;
  
              mStandardOutput.BeginRead(mReadBuffer, 0, mReadBuffer.Length, StandardOutputReadCallback, null);
  
              build.WaitForExit();
  
              byte[] _data5 = mStandardOutputMs.ToArray();
  
              mStandardOutput.Close();
  
          }
  
          catch (Exception _ex)
  
          {
  
  
  
          }
  
          finally
  
          {
  
              build.Dispose();
  
          }
  
      }

  The code hangs where I indicated.

  Can anyone advise please ?

  Thanks

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