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• using ffmpeg for silence detect with input pipe

  24 août 2018, par Moharrer

  I am trying to detect silence from audio file with ffmpeg in c#.
  i want to pipe input from c# memory stream and get silence duration like following command

  ffmpeg -hide_banner -i pipe:0 -af silencedetect=noise=-50dB:d=0.5 -f null - 

  but there is a problem, when input stream pump in pipe, ffmpeg waiting in p.WaitForExit() line.
  when i change p.WaitForExit() to p.WaitForExit(1000) and set force timeout the following result is displayed.
  

  [mp3 @ 00000163818da580] invalid concatenated file detected - using bitrate for durationInput #0, mp3, from ’pipe:0’ :  
  Metadata :    encoder : Lavf57.71.100  Duration : N/A, start : 0.023021, bitrate : 86 kb/s    
  Stream #0:0 : Audio : mp3, 48000 Hz, mono, fltp, 86 kb/sStream mapping :  Stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))Output #0, null, to ’pipe :’ :  
  Metadata :    encoder : Lavf58.17.101    Stream #0:0 : Audio : pcm_s16le, 48000 Hz, mono, s16, 768 kb/s   
   Metadata :      encoder : Lavc58.21.105 pcm_s16le
  [silencedetect @ 0000023df1786840] silence_start : 50.1098
  
  [silencedetect @ 0000023df1786840] silence_end : 51.5957 | silence_duration : 1.48588
  
  [silencedetect @ 0000023df1786840] silence_start : 51.5959
  
  [silencedetect @ 0000023df1786840] silence_end : 52.127 | silence_duration : 0.531062
  
  [silencedetect @ 0000023df1786840] silence_start : 52.8622
  
  [silencedetect @ 0000023df1786840] silence_end : 54.0096 | silence_duration : 1.14733
  
  [silencedetect @ 0000023df1786840] silence_start : 54.6804
  

  as you can see in result silence detection done but with error at the first.
  this mean input file pumped correctly in ffmpg but waiting.
  how can i solve problem without set time out for p.WaitForExit()

  private void Execute(string exePath, string parameters, Stream inputStream)
          
              byte[] Data = new byte[5000] ;
              var p = new Process() ;
  
              var sti = p.StartInfo ;
  
              sti.CreateNoWindow = true ;
  
              sti.UseShellExecute = false ;
  
              sti.FileName = exePath ;
  
              sti.Arguments = arg ;
  
              sti.LoadUserProfile = false ;
  
              sti.RedirectStandardInput = true ;
  
              sti.RedirectStandardOutput = true ;
              sti.RedirectStandardError = true ;
              p.ErrorDataReceived += P_ErrorDataReceived ;
  
              p.OutputDataReceived += P_OutputDataReceived ;
              p.Start() ;
              p.BeginOutputReadLine() ;
  
              p.BeginErrorReadLine() ;
              var spInput = new StreamPump(inputStream, p.StandardInput.BaseStream, 4064) ;
  
              spInput.Pump((pump, result) =>
  
              
  
                  pump.Output.Flush() ;
  
                  inputStream.Dispose() ;
  
              ) ;
              //unlimited waiting
  
              //p.WaitForExit() ;
              p.WaitForExit(1000) ;
          
  

• 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 ?

• 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.