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• FFMPEG WAV file not spitting out correct audio length

  7 juin 2018, par Alexander Leon

  I am piping the audio out with the ’attachment’ header so that the result is immediately downloaded. With other formats, such as mp3, the duration on the downloaded file metadata is set correctly. With WAV tho, the duration reads 00:00, which makes it basically unusable by audio players like iTunes. Any help ?

  app.get('/', (req, res) => {
  
      res.contentType('audio/wav');
  
      res.attachment('somefile.wav');
  
      var pathToAudio = 'https://dl.dropbox.com/s/pc7qp4wrf46t9op/test-clip.webm?dl=0';
  
      ffmpeg(pathToAudio)
  
          // .output(stream, {end: true})
  
          .toFormat('wav')
  
          // setup event handlers
  
          .on('error', function(err) {
  
              console.log('an error happened: ' + err.message);
  
          })
  
          .pipe(res {end: true})
  
  });

• Add aac single audio to MPEG DASH mpd files

  26 avril 2017, par Adminy

  I am trying to add manually to the .mpd file the following code.

      <adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true" lang="English">
  
          <representation mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="44100">
  
              <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
  
              <segmenttemplate timescale="44100" media="http://localhost/audio.aac" startnumber="1">
  
              </segmenttemplate>
  
          </representation>
  
      </adaptationset>

  But its not working, Does everything have to be segmented in .mpd files ? or can I have a single .acc file ?

• C# Start Process on Mac - FFMPEG - Exit Code 1

  3 février 2016, par Ben Hayward

  I am trying to start a process on Mac and Windows (using Unity) to run FFMPEG to convert a video to a .ogv video. My code is as follows :

      string command = "ffmpeg -i '" + filepath + "'  -codec:v libtheora -qscale:v 10 -codec:a libvorbis -qscale:a 10 -y '"+workingDir+"/ogv_Video/"+System.IO.Path.GetFileNameWithoutExtension(filepath)+".ogv'";
  
      UnityEngine.Debug.Log("Command: "+command);
  
  
  
      try{
  
  
  
          System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo (workingDir+"/..", command);
  
          startInfo.CreateNoWindow = true;
  
          startInfo.RedirectStandardOutput = true;
  
          startInfo.RedirectStandardError = true;
  
          startInfo.UseShellExecute = false;
  
          startInfo.FileName =workingDir+"/ffmpeg";
  
  
  
          //Process.Start (startInfo);
  
          Process p = Process.Start(startInfo); 
  
          p.EnableRaisingEvents = true;
  
          string strOutput = p.StandardOutput.ReadToEnd(); 
  
          UnityEngine.Debug.Log ("Running..."+strOutput);
  
          p.WaitForExit(); 
  
  
  
          UnityEngine.Debug.Log ("Got here. "+strOutput);
  
          int exitCode = p.ExitCode;
  
          UnityEngine.Debug.Log ("Process exit code = "+exitCode);
  
      }
  
      catch(Exception e) {
  
          UnityEngine.Debug.Log ("An error occurred");
  
          UnityEngine.Debug.Log ("Error: "+e);
  
      }

  The command executes and does not through any exception. However, it terminates instantly and prints Exit Code 1 which is "Catchall for general errors" -this seems not too helpful !

  What am I doing wrong with my code, please ?

  You’ll notice that my code prints out the command in full. If I copy that command and paste it into the terminal, it runs absolutely fine.