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• C# .net mvc Process return encoding progress (FFMpeg) to client initiated with ajax

  19 décembre 2014, par user1585895

  I am using FFMpeg to encode wav to mp3s, and on completion download the final .zip to the client.

  All works great, and I can Debug.WriteLine the progress of the encoding, but I would like to return _percentage back to the client to do some UI updates based on the value of _percentage and if all encoding is done, Im not sure how to approach this.

  My thinking is as follows :

  • ajax post to CreateAndDownloadAlbum(List trackIds, int productId)
  • loop through List and create a new Process, run
    — parse StdError to get encoding percentage in myProcess_ErrorData(object source, DataReceivedEventArgs e)
    — send _percentage value at timed intervals back to CreateAndDownloadAlbum
    — update UI based on value of _percentage, when all is complete break and call public ActionResult SendFileDownload()

  Any input would be great.

  Thanks !

  front end AJAX call to post list of file Ids to download

  var data = $('#downloadAlbum').serialize();
  
  $.ajax({
  
      url: "/Admin/CreateAndDownloadAlbum",
  
      method: "POST",
  
      data: data,
  
      dataType: 'json',
  
      success: function(result) {
  
           // wait here for _percentage
  
           // if not 100, call again to get new _percentage value
  
           // if 100, update UI, move to next file being encoded
  
           // if all encoding is complete, call SendFileDownload() in controller
  
      }
  
  });

  then the controller code

  [HttpPost]
  
      public void CreateAndDownloadAlbum(List<trackstodownload> trackIds, int productId)
  
      {
  
          _numTracksToDownload = trackIds.Count;
  
          var product = _productRepository.GetProductById(productId);
  
          var artist = _artistRepository.GetArtistById(product.ArtistId);
  
  
  
          var folderGuid = Guid.NewGuid();
  
          _zipFolder = string.Concat(artist.ArtistName.ToUpper().Replace(" ", "_"), "[", product.ProductName.ToUpper().Replace(" ", "_"), "].zip");
  
          _mp3FolderPath = Server.MapPath("/Files/" + productId + "/" + folderGuid);
  
          _zipDownloadPath = Server.MapPath("/Delivery/" + _zipFolder);
  
  
  
          if (!Directory.Exists(Server.MapPath("/Files/" + productId + "/" + folderGuid)))
  
          {
  
              Directory.CreateDirectory(Server.MapPath("/Files/" + productId + "/" + folderGuid));
  
          }
  
  
  
          foreach (var z in trackIds)
  
          {
  
              var track = _trackRepository.GetTrackById(z.TrackId);
  
              var process = new Process();
  
              var startInfo = new ProcessStartInfo
  
              {
  
                  WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden,
  
                  FileName = "F:\\Development\\ffmpeg\\ffmpeg.exe",
  
                  RedirectStandardOutput = true,
  
                  RedirectStandardError = true,
  
                  UseShellExecute = false
  
              };
  
              var startFile = Path.Combine("F:\\Development","Files", track.ProductId.ToString(), track.TrackFileName);
  
              var endFile = Path.Combine("F:\\Development", "Files", track.ProductId.ToString(), folderGuid.ToString(), track.TrackFileName.Replace(".wav", ".mp3"));
  
  
  
              startInfo.Arguments = "-i " + startFile + " -b:a 320k " + endFile + " -stats";
  
              process.StartInfo = startInfo;
  
              process.EnableRaisingEvents = true;
  
              process.Exited += myProcess_exited;
  
              process.OutputDataReceived += myProcess_OutputData;
  
              process.ErrorDataReceived += myProcess_ErrorData;
  
  
  
              try
  
              {
  
                  process.Start();
  
                  process.BeginOutputReadLine();
  
                  process.BeginErrorReadLine();
  
  
  
                  if (process.HasExited == false)
  
                  {
  
                      process.WaitForExit();
  
                  }
  
              }
  
              catch (Exception)
  
              {
  
  
  
                  throw;
  
              }
  
          }
  
  
  
          SendFileDownload();
  
  
  
      }
  
  
  
      public ActionResult SendFileDownload()
  
      {
  
          // zip and move to delivery folder
  
          using (var zip = new ZipFile())
  
          {
  
              zip.AddDirectory(_mp3FolderPath, _zipFolder);
  
              zip.Save(_zipDownloadPath);
  
          }
  
  
  
          // delete items in temp guid folder
  
          var downloadedMessageInfo = new DirectoryInfo(_mp3FolderPath);
  
          foreach (var f in downloadedMessageInfo.GetFiles())
  
          {
  
              f.Delete();
  
          }
  
  
  
          // delete temp folder
  
          Directory.Delete(_mp3FolderPath);
  
  
  
          // download file
  
          string file = _zipDownloadPath;
  
          return File(file, "application/force-download", Path.GetFileName(file));
  
  
  
      }
  
  
  
      public void myProcess_exited(Object source, EventArgs e)
  
      {
  
          Debug.WriteLine("myProcess_exited ===================================");
  
          _duration = new TimeSpan(0, 0, 0);
  
          _frameTime = new TimeSpan(0, 0, 0);
  
          _percentage = 0;
  
          _numEncodedTracks++; // using this to tell me if all tracks have been encoded
  
      }
  
  
  
      public void myProcess_OutputData(object source, DataReceivedEventArgs e)
  
      {
  
      }
  
  
  
      public void myProcess_ErrorData(object source, DataReceivedEventArgs e)
  
      {
  
          string strMessage = e.Data;
  
  
  
          if (!string.IsNullOrEmpty(strMessage) &amp;&amp; (strMessage.Contains("Duration: ") || strMessage.Contains("size=")))
  
          {
  
              if (_duration != null)
  
              {
  
                  if (strMessage.Contains("Duration: "))
  
                  {
  
                      _strDuration = strMessage.Substring(strMessage.IndexOf("Duration: ") + ("Duration: ").Length,
  
                          ("00:00:00.00").Length);
  
  
  
                      char[] d_delHrMn = new char[] { ':' };
  
                      string[] d_tempHrMn = _strDuration.Split(d_delHrMn, StringSplitOptions.RemoveEmptyEntries);
  
  
  
                      char[] d_delSec = new char[] { '.' };
  
                      string[] d_tempSec = d_tempHrMn[2].Split(d_delSec, StringSplitOptions.RemoveEmptyEntries);
  
  
  
                      var d_hour = d_tempHrMn[0] == "0" ? 0 : Convert.ToInt32(d_tempHrMn[0]);
  
                      var d_min = d_tempHrMn[1] == "0" ? 0 : Convert.ToInt32(d_tempHrMn[1]);
  
                      var d_sec = d_tempSec[0] == "0" ? 0 : Convert.ToInt32(d_tempSec[0]);
  
  
  
                      _duration = new TimeSpan(d_hour, d_min, d_sec);
  
                  }
  
              }
  
  
  
              if (strMessage.Contains("size="))
  
              {
  
                  _strFrameTime = strMessage.Substring(strMessage.IndexOf("time=") + ("time=").Length,
  
                      ("00:00:00.00").Length);
  
  
  
                  char[] f_delHrMn = new char[] { ':' };
  
                  string[] f_tempHrMn = _strFrameTime.Split(f_delHrMn, StringSplitOptions.RemoveEmptyEntries);
  
  
  
                  char[] f_delSec = new char[] { '.' };
  
                  string[] f_tempSec = f_tempHrMn[2].Split(f_delSec, StringSplitOptions.RemoveEmptyEntries);
  
  
  
                  var f_hour = f_tempHrMn[0] == "0" ? 0 : Convert.ToInt32(f_tempHrMn[0]);
  
                  var f_min = f_tempHrMn[1] == "0" ? 0 : Convert.ToInt32(f_tempHrMn[1]);
  
                  var f_sec = f_tempSec[0] == "0" ? 0 : Convert.ToInt32(f_tempSec[0]);
  
  
  
                  _frameTime = new TimeSpan(f_hour, f_min, f_sec);
  
  
  
              }
  
  
  
              if (_strDuration != "00:00:00.00" &amp;&amp; _strFrameTime != "00:00:00.00" &amp;&amp; _percentage &lt; 100)
  
              {
  
                  _percentage = _frameTime.TotalMilliseconds / _duration.TotalMilliseconds * 100;
  
                  Debug.WriteLine(_percentage + " || " + _frameTime + " " + _duration);
  
              }
  
          }
  
      }
  
  </trackstodownload>

• FFMPEG - Doesn't show -vstats

  22 juillet 2015, par Mateusz Kasprzak

  I’m working with ffmpeg library and PHP. I want to get informations about video.mp4.
  The problem is that it works on my localhost( Windows 7/ Xampp ) , but on my linux server it doesn’t... I’m able to convert videos, but I’m not able to use :

  -vstats

  I’m using that command :

  $output = shell_exec( '/usr/bin/ffmpeg  -i video.mp4 -vstats 2>&1');  

  And I can get proper output on localhost, but not on my server. What could be the problem here ? I’m trying to finish it, but it seems it’s impossible...

  Best Regards,

  Mateusz

• ffmpeg doesn't accept input in script

  21 octobre 2022, par Eberhardt

  this is a beginner's question but i can't figure out the answer after looking into it for several days :

  


  I want ffmpeg to extract the audio portion of a video and save it in an .ogg container. If i run the following command in terminal it works as expected :

  


  ffmpeg -i example.webm -vn -acodec copy example.ogg


  


  For convenience, i want to do this in a script. However, if i pass a variable to ffmpeg it apparently just considers the first word and produces the error "No such file or directory".

  


  I noticed that my terminal escapes spaces by a \ so i included this in my script. This doesn't solve the problem though.

  


  Can someone please explain to me, why ffmpeg doesn't consider the whole variable that is passed to it in a script while working correctly when getting passed the same content in the terminal ?

  


  This is my script that passes the filename with spaces escaped by \ to ffmpeg :

  


  #!/bin/bash

titelschr=$(echo $@ | sed "s/ /\\\ /g")
titelohne=$(echo $titelschr | cut -d. -f 1)
titelogg=$(echo -e ${titelohne}.ogg)  

ffmpeg -i $titelschr -vn -acodec copy $titelogg


  


  Thank you very much in advance !