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• How to convert a Stream on the fly with FFMpegCore ?

  18 octobre 2023, par Adrian

  For a school project, I need to stream videos that I get from torrents while they are downloading on the server.
When the video is a .mp4 file, there's no problem, but I must also be able to stream .mkv files, and for that I need to convert them into .mp4 before sending them to the client, and I can't find a way to convert my Stream that I get from MonoTorrents with FFMpegCore into a Stream that I can send to my client.

  


  Here is the code I wrote to simply download and stream my torrent :

  


  var cEngine = new ClientEngine();

var manager = await cEngine.AddStreamingAsync(GenerateMagnet(torrent), ) ?? throw new Exception("An error occurred while creating the torrent manager");

await manager.StartAsync();
await manager.WaitForMetadataAsync();

var videoFile = manager.Files.OrderByDescending(f => f.Length).FirstOrDefault();
if (videoFile == null)
    return Results.NotFound();

var stream = await manager.StreamProvider!.CreateStreamAsync(videoFile, true);
return Results.File(stream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);


  


  I saw that the most common way to convert videos is by using ffmpeg. .NET has a package called FFMpefCore that is a wrapper for ffmpeg.

  


  To my previous code, I would add right before the return :

  


  if (!videoFile.Path.EndsWith(".mp4"))
{
    var outputStream = new MemoryStream();
    FFMpegArguments
        .FromPipeInput(new StreamPipeSource(stream), options =>
        {
            options.ForceFormat("mp4");
        })
        .OutputToPipe(new StreamPipeSink(outputStream))
        .ProcessAsynchronously();
    return Results.File(outputStream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);
}


  


  I unfortunately can't get a "live" Stream to send to my client.

  


• ffmpeg c# asp.net video conversion error

  3 mai 2012, par Arun Kumar

  The following code shows error as "StandardOut has not been redirected or the process hasn't started yet." What is the problem in this code ? It requires any changes ? It always clear the process by catch exception.

  static void ExecuteAsync()
  
              {
  
                  if (File.Exists("Videos/output.flv"))
  
                  try
  
                  {
  
                      File.Delete("Videos/output.flv");
  
                  }
  
                  catch
  
                  {
  
                      return;
  
                  }
  
  
  
              try
  
              {
  
                  process = new Process();
  
                  ProcessStartInfo info = new ProcessStartInfo(@"e:\ffmpeg\bin\ffmpeg.exe", "-i cars1.flv -same_quant intermediate1.mpg");
  
                  info.CreateNoWindow = false;
  
                  info.UseShellExecute = false;
  
                  info.RedirectStandardError = true;
  
                  info.RedirectStandardOutput = true;
  
                  process.StartInfo = info;
  
                  process.EnableRaisingEvents = true;
  
                  process.ErrorDataReceived += new DataReceivedEventHandler(process_ErrorDataReceived);
  
                  process.OutputDataReceived += new DataReceivedEventHandler(process_OutputDataReceived);
  
                  process.Exited += new EventHandler(process_Exited);
  
                  process.Start();
  
                  process.BeginOutputReadLine();
  
                  process.BeginErrorReadLine();
  
              }
  
              catch (Exception ex)
  
              {
  
                  if (process != null) process.Dispose();
  
              }
  
          }
  
          static int lineCount = 0;
  
          static void process_ErrorDataReceived(object sender, DataReceivedEventArgs e)
  
          {
  
              Console.WriteLine("Input line: {0} ({1:m:s:fff})", lineCount++, DateTime.Now);
  
              Console.WriteLine(e.Data);
  
              Console.WriteLine();
  
          }
  
  
  
          static void process_OutputDataReceived(object sender, DataReceivedEventArgs e)
  
          {
  
              Console.WriteLine("Output Data Received.");
  
          }
  
  
  
          static void process_Exited(object sender, EventArgs e)
  
          {
  
              process.Dispose();
  
              Console.WriteLine("Bye bye!");
  
          }
  
      }

• How to interact with process output ?

  14 mai, par 1ben99

  Ok so at the moment I have a program which runs FFmpeg using a process in VB.net. I send the process arguments in the startinfo as well as other things like the file location. When I run the code it sends the console output to the debug console ; this is probably because I have the .UseShellExecute = False and processInfo.RedirectStandardOutput = True

  



  My question is : How do I make something which can interpret the output ? Also with FFmpeg, the process is continuous so the process is always running for the most part and constantly adding more output lines in the debug console.

  



  The code I am using :

  



  Dim process As New Process
        Dim processInfo As New ProcessStartInfo
        processInfo.FileName = tempPath
        processInfo.Arguments = ("-r 1/.1 -i " + link + " -c copy " + saveLocation + "\" + streamerName + ".ts")
        processInfo.UseShellExecute = False
        processInfo.WindowStyle = ProcessWindowStyle.Hidden
        processInfo.CreateNoWindow = True
        processInfo.RedirectStandardOutput = True
        process.StartInfo = processInfo
        process.Start()


  



  I tried this with no luck.

  



  Dim output As String
        Using StreamReader As System.IO.StreamReader = process.StandardOutput
            output = StreamReader.ReadToEnd().ToString
        End Using


  



  Edit : I now have this code :

  



  Dim process As New Process
        AddHandler process.OutputDataReceived, AddressOf CallbackProcesoAsync
        AddHandler process.ErrorDataReceived, AddressOf ErrorDataReceivedAsync
        Dim processInfo As New ProcessStartInfo
        processInfo.FileName = tempPath
        processInfo.Arguments = ("-r 1/.1 -i " + link + " -c copy " + saveLocation + "\" + streamerName + ".ts")
        processInfo.UseShellExecute = False
        processInfo.WindowStyle = ProcessWindowStyle.Hidden
        processInfo.CreateNoWindow = False
        processInfo.RedirectStandardOutput = True
        processInfo.RedirectStandardError = True
        process.StartInfo = processInfo
        process.Start()
        processes.Add(Tuple.Create(tempPath, streamerName))
        Debug.WriteLine("Attempting to record " + streamerName)
        Dim output As String
        Using StreamReader As System.IO.StreamReader = process.StandardOutput
            output = StreamReader.ReadToEnd().ToString
        End Using
    End If
End Sub

Private Sub CallbackProcesoAsync(sender As Object, args As System.Diagnostics.DataReceivedEventArgs)
    If Not args.Data Is Nothing AndAlso Not String.IsNullOrEmpty(args.Data) Then
        RichTextBox1.Text = args.Data
    End If
End Sub

Private Sub ErrorDataReceivedAsync(sender As Object, args As System.Diagnostics.DataReceivedEventArgs)
    If Not args.Data Is Nothing AndAlso Not String.IsNullOrEmpty(args.Data) Then
        RichTextBox2.Text = args.Data
    End If
End Sub


  



  But I have not recieved any outputs to the richtextboxes ?

  



  I feel like it has something to do with the streamReader so I removed it and it still didn't work ? I don't have any more ideas what it could be.