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• How do I set ffmpeg pipe output ?

  5 décembre 2019, par mr_blond

  I need to read ffmpeg output as pipe.
  There is a code example :

      public static void PipeTest()
  
      {
  
          Process proc = new Process();
  
          proc.StartInfo.FileName = Path.Combine(WorkingFolder, "ffmpeg");
  
          proc.StartInfo.Arguments = String.Format("$ ffmpeg -i input.mp3 pipe:1");
  
          proc.StartInfo.UseShellExecute = false;
  
          proc.StartInfo.RedirectStandardInput = true;
  
          proc.StartInfo.RedirectStandardOutput = true;
  
          proc.Start();
  
  
  
          FileStream baseStream = proc.StandardOutput.BaseStream as FileStream;
  
          byte[] audioData;
  
          int lastRead = 0;
  
  
  
          using (MemoryStream ms = new MemoryStream())
  
          {
  
              byte[] buffer = new byte[5000];
  
              do
  
              {
  
                  lastRead = baseStream.Read(buffer, 0, buffer.Length);
  
                  ms.Write(buffer, 0, lastRead);
  
              } while (lastRead > 0);
  
  
  
              audioData = ms.ToArray();
  
          }
  
  
  
          using(FileStream s = new FileStream(Path.Combine(WorkingFolder, "pipe_output_01.mp3"), FileMode.Create))
  
          {
  
              s.Write(audioData, 0, audioData.Length);
  
          }
  
      }

  It’s log from ffmpeg, the first file is readed :

  Input #0, mp3, from ’norm.mp3’ :
  Metadata :
  encoder : Lavf58.17.103
  Duration : 00:01:36.22, start : 0.023021, bitrate : 128 kb/s
  Stream #0:0 : Audio : mp3, 48000 Hz, stereo, fltp, 128 kb/s
  Metadata :
  encoder : Lavc58.27

  Then pipe :

  [NULL @ 0x7fd58a001e00] Unable to find a suitable output format for ’$’
  $ : Invalid argument

  If I run "-i input.mp3 pipe:1", the log is :

  Unable to find a suitable output format for ’pipe:1’ pipe:1 : Invalid
  argument

  How do I set correct output ? And how should ffmpeg know what the output format is at all ?

• Video encoded by ffmpeg.exe giving me a garbage video in c# .net

  10 septembre 2018, par Amit Yadav

  I want to record video through webcam and file to be saved in .mp4 format. So for recording i am using AforgeNet.dll for recording and for mp4 format i am encoding raw video into mp4 using ffmpeg.exe using NamedPipeStreamServer as i receive frame i push into the named pipe buffer. this process works fine i have checked in ProcessTheErrorData event but when i stop recording the output file play garbage video shown in the image below

  

  Here is Code for this

     Process Process;
  
    NamedPipeServerStream _ffmpegIn;
  
      byte[]  _videoBuffer ;
  
      const string PipePrefix = @"\\.\pipe\";
  
      public void ffmpegWriter()
  
      {
  
          if(File.Exists("outputencoded.mp4"))
  
          {
  
              File.Delete("outputencoded.mp4");
  
          }
  
  
  
          _videoBuffer = new byte[widht * heigth * 4];
  
          var audioPipeName = GetPipeName();
  
          var videoPipeName = GetPipeName();
  
          var videoInArgs = $@" -thread_queue_size 512 -use_wallclock_as_timestamps 1 -f rawvideo -pix_fmt rgb32 -video_size 640x480 -i \\.\pipe\{videoPipeName}";
  
          var videoOutArgs = $"-vcodec libx264 -crf 15 -pix_fmt yuv420p -preset ultrafast -r 10";
  
          _ffmpegIn = new NamedPipeServerStream(videoPipeName, PipeDirection.Out, 1, PipeTransmissionMode.Byte, PipeOptions.Asynchronous, 0, _videoBuffer.Length);
  
          Process=StartFFmpeg($"{videoInArgs} {videoOutArgs} \"{"outputencoded.mp4"}\"", "outputencoded.mp4");
  
      }
  
  
  
   bool WaitForConnection(NamedPipeServerStream ServerStream, int Timeout)
  
      {
  
          var asyncResult = ServerStream.BeginWaitForConnection(Ar => { }, null);
  
  
  
          if (asyncResult.AsyncWaitHandle.WaitOne(Timeout))
  
          {
  
              ServerStream.EndWaitForConnection(asyncResult);
  
  
  
              return ServerStream.IsConnected;
  
          }
  
  
  
          return false;
  
      }
  
    static string GetPipeName() => $"record-{Guid.NewGuid()}";
  
  
  
   public static Process StartFFmpeg(string Arguments, string OutputFileName)
  
          {
  
              var process = new Process
  
              {
  
                  StartInfo =
  
                  {
  
                      FileName = "ffmpeg.exe",
  
                      Arguments = Arguments,
  
                      UseShellExecute = false,
  
                      CreateNoWindow = true,
  
                      RedirectStandardError = true,
  
                      RedirectStandardInput = true,
  
  
  
                  },
  
                  EnableRaisingEvents = true
  
              };
  
  
  
              //  var logItem = ServiceProvider.Get<ffmpeglog>().CreateNew(Path.GetFileName(OutputFileName));
  
  
  
              process.ErrorDataReceived += (s, e) => ProcessTheErrorData(s,e);
  
  
  
              process.Start();
  
  
  
              process.BeginErrorReadLine();
  
  
  
              return process;
  
          }
  
  </ffmpeglog>

  and Writing each frame like this.

   private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
          {
  
  
  
              try
  
              {
  
                  if (_recording)
  
                  {
  
  
  
                      using (var bitmap = (Bitmap) eventArgs.Frame.Clone())
  
                      {
  
                         var _videoBuffers = ImageToByte(bitmap);
  
  
  
  
  
                              if (_firstFrameTime != null)
  
                              {
  
                              bitmap.Save("image/" + DateTime.Now.ToString("ddMMyyyyHHmmssfftt")+".bmp");
  
  
  
                                  _lastFrameTask?.Wait();
  
  
  
  
  
                                  _lastFrameTask = _ffmpegIn.WriteAsync(_videoBuffers, 0, _videoBuffers.Length);
  
                              }
  
                              else
  
                              {
  
                                  if (_firstFrame)
  
                                  {
  
                                      if (!WaitForConnection(_ffmpegIn, 5000))
  
                                      {
  
                                          throw new Exception("Cannot connect Video pipe to FFmpeg");
  
                                      }
  
  
  
                                      _firstFrame = false;
  
                                  }
  
  
  
                                  _firstFrameTime = DateTime.Now;
  
                                  _lastFrameTask?.Wait();
  
  
  
                                  _lastFrameTask = _ffmpegIn.WriteAsync(_videoBuffers, 0, _videoBuffers.Length);
  
  
  
                              }
  
  
  
                      }
  
                  }
  
                  using (var bitmap = (Bitmap) eventArgs.Frame.Clone())
  
                  {
  
                      var bi = bitmap.ToBitmapImage();
  
                      bi.Freeze();
  
                      Dispatcher.CurrentDispatcher.Invoke(() => Image = bi);
  
                  }
  
              }
  
              catch (Exception exc)
  
              {
  
                  MessageBox.Show("Error on _videoSource_NewFrame:\n" + exc.Message, "Error", MessageBoxButton.OK,
  
                      MessageBoxImage.Error);
  
                  StopCamera();
  
              }
  
          }

  Even i have written each frame to disk as bitmap .bmp and frames are correct but i don’t know what’s i am missing here ? please help thanks in advance.

• Stream with ffmpeg over LAN ?

  5 septembre 2018, par Kalpit

  I’m trying to stream a mpegts file over LAN, with the command

  ffmpeg -re -i in.ts -vcodec copy -acodec copy -f mpegts "udp://localhost:5000/live/stream"

  And trying to capture 10s chunks of it over LAN(at server) at

  ffmpeg  -i udp://192.168.xx.xx:5000/live/stream -c copy -f segment -segment_time 10 -strftime 1 "in /%Y-%m-%d_%H-%M-%S.mp4"

  This isn’t working. I tested the stream in VLC, and there’s nothing to play.

  Now, I suspect this is a port issue, since FFMPEG doesnt seem to write/listen over the 5000 port specified. I used netstat to check, and there are no PID including ffmpeg on the port. However, the command

  ffmpeg  -i udp://127.0.0.1:5000/live/stream -c copy -f segment -segment_time 10 -strftime 1 "in/%Y-%m-%d_%H-%M-%S.mp4"

  generates the desired output on my machine(localhost), as does ffplay. Can anyone help ?