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• Process is not exiting ffmpeg.exe only for the command which detects the silences from a video

  20 juillet 2015, par Jitender Kumar

  The job of the method ExecuteCommandSync is to detect the silences from a video and return the output as string but when I run this code it never bring the value of proc.HasExited as true. If I forcefully drag the debugger to the line

  result =proc.StandardOutput.ReadToEnd()

  then it never exit the ffmpeg.exe so as a result control never returns back.

  Although the same method is working fine for a different command like creating an audio file from a video. In this case proc.HasExited also returns false but it also generates the audio file successfully.

  public static string ExecuteCommandSync(string fileName, int timeoutMilliseconds)
  
      {
  
          string result = String.Empty;
  
          string workingDirectory = Directory.GetCurrentDirectory();
  
          try
  
          {
  
              string command = string.Format("ffmpeg -i {0} -af silencedetect=noise=-20dB:d=0.2 -f null -", "\"" + fileName + "\"");                
  
              System.Diagnostics.ProcessStartInfo procStartInfo =
  
                  new System.Diagnostics.ProcessStartInfo("cmd", "/c " + command);
  
  
  
              procStartInfo.WorkingDirectory = workingDirectory;                
  
              procStartInfo.RedirectStandardOutput = true;
  
              procStartInfo.RedirectStandardError = true;
  
              procStartInfo.UseShellExecute = false;                
  
              procStartInfo.CreateNoWindow = false;                
  
              System.Diagnostics.Process proc = new System.Diagnostics.Process();
  
              proc.StartInfo = procStartInfo;
  
              proc.Start();                
  
              proc.WaitForExit(timeoutMilliseconds);
  
              // Get the output into a string 
  
              if (proc.HasExited)
  
              {
  
                  if (!proc.StandardOutput.EndOfStream)
  
                  {
  
                      result = proc.StandardOutput.ReadToEnd();
  
                  }
  
                  else if (!proc.StandardError.EndOfStream)
  
                  {
  
                      result = "Error:: " + proc.StandardError.ReadToEnd();
  
                  }
  
              }
  
          }
  
          catch (Exception)
  
          {
  
              throw;
  
          }
  
          return result;
  
      }

  So please advice.

• How to implement FFMPEG retry logic [closed]

  18 mars, par M9A

  I am recording a live stream using the following code :

  


  ffmpeg -i <stream url="url"> -c copy output.mp4&#xA;</stream>

  


  This works fine for occasions where the stream is segmented in the sense that it will retry if the stream drops. However if the url no longer exists or returns a code such as 403, it will still retry, resulting in an infinite loop of retrying when the stream doesnt exist.

  


  How can I retry for segments but maybe retry only a few times for page errors ?

  


• FFmpeg - how to configure H264 encoder to output 1 packet after 1 frame (no B frames)

  30 octobre 2018, par maxest

  Is it possible to configure FFmpeg encoder such that when I call :

  avcodec_send_frame

  I can then call :

  avcodec_receive_packet

  and receive the packet ?

  Right now I have to call avcodec_send_frame a few dozens times before avcodec_receive_packet returns any valid packet. In other words I would like the latency to be reduced to 0.