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• Appending two audiofiles React Native

  21 October 2020, by R. Adang

  I want to combine to wav files into one file. So file1 + file2 = file3.
I am currently looking into ffmpeg, but when I try to use concat it only returns a file with the length of the first file. The react native code that I use is:

  



  RNFFmpeg.execute('-i "concat:' + path1 + '|' + pathOutput + '" -acodec copy ' + pathOutput2).then(result => console.log("FFmpeg process exited with rc " + result.rc)); 


  



  Is my command wrong?

  



  If you have a better solution for this please let me know!

  


• finding the bitrate value of mkv file

  11 July 2022, by david

  I am trying to find the bitrate value of a video using ffprobe as follows:

  


  ffprobe -i sample_5.mkv -v quiet -show_entries stream=bit_rate -hide_banner -of default=noprint_wrappers=1:nokey=1


  


  but all files have Mkv format and this command returns N/A. when I use ffmpeg -i input.mkv in the last line of output the bitrate value is shown. I do not know what is the problem. I need to have the bitrate value of each video. Could you please tell me how can I find it in python? Thank you.

  


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

  20 July 2015, by 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.