Concurrent Encoding

This example will help you implementing concurrent video processing in the background and providing publishing status to the application in real-time using asp.net.

Example Code

protected string SourceFileName = "wildlife.wmv";
protected string PublishedFileName = "wildlife";
protected void Page_Load(object sender, EventArgs e)
{
  if (!Page.IsPostBack)
  {
     if (Request.Params["sfile"] != null)
     {
        this.SourceFileName = Request.Params["sfile"].ToString();
     }
     if (Request.Params["file"] != null)
     {
       this.PublishedFileName = Request.Params["file"].ToString();
     }
  }
}

public static List<MediaHandler> _lst = new List<MediaHandler>();
[WebMethod]
public static string EncodeVideo(string Source, string Published)
{
   var_mhandler = new MediaHandler();
   var RootPath = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath);
  _mhandler.FFMPEGPath = HttpContext.Current.Server.MapPath("~\\ffmpeg\\bin\\ffmpeg.exe");
  _mhandler.InputPath = RootPath + "\\contents\\original";
  _mhandler.OutputPath = RootPath + "\\contents\\mp4";
  _mhandler.BackgroundProcessing = true;
  //_mhandler.FileName = "wildlife.wmv";
  _mhandler.FileName = Source;
  _mhandler.OutputFileName = Published;
  string presetpath = RootPath + "\\ffmpeg\\presets\\libx264-ipod640.ffpreset";
  _mhandler.Parameters = " -b:a 192k -b:v 500k -fpre \"" + presetpath + "\"";
  _mhandler.OutputExtension = ".mp4";
  _mhandler.VCodec = "libx264";
  _mhandler.ACodec = "libvo_aacenc";
  _mhandler.Channel = 2;
  //******************************
  // 360p mp4 encoding
  //******************************
  _mhandler.Width = 640;
  _mhandler.Height = 380;
  _mhandler.Audio_SamplingRate = 44100;
  //*******************************
  // 480p mp4 encoding
  //*******************************
  //_mhandler.Width = 854;
  //_mhandler.Height = 480;
  //_mhandler.Video_Bitrate = 1000;
  //_mhandler.Audio_SamplingRate = 44100;
  //_mhandler.Audio_Bitrate = 128;
  //*******************************
  // 720p mp4 encoding
  //*******************************
  //_mhandler.Width = 1280;
  //_mhandler.Height = 720;
  //_mhandler.Video_Bitrate = 2200;
  //_mhandler.Audio_SamplingRate = 44100;
  //_mhandler.Audio_Bitrate = 96;
  //*******************************
  // 1080p mp4 encoding
  //*******************************
  //_mhandler.Width = 1920;
  //_mhandler.Height = 1080;
  //_mhandler.Video_Bitrate = 2900;
  //_mhandler.Audio_SamplingRate = 44100;
  //_mhandler.Audio_Bitrate = 152;
  _mhandler.ProcessMedia();
  if (_mhandler.vinfo.ErrorCode > 0)
  {
  // validation error occured, don't proceed more
  return _mhandler.vinfo.ErrorCode.ToString();
  }
  else
  {
  _mhandler.vinfo.ProcessID = Guid.NewGuid().ToString(); // unique guid to attach with each process to identify proper object on progress bar and get info request
  _lst.Add(_mhandler);
  return _mhandler.vinfo.ProcessID;
  }
 }


 [WebMethod]
  public static string GetProgressStatus(string ProcessID)
  {
     string completed_process = "0";
     if (_lst.Count > 0)
     {
       int i = 0;
       for (i = 0; i <= _lst.Count - 1; i++)
       {
          if (_lst[i].vinfo.ProcessID == ProcessID)
          {
             completed_process = Math.Round(_lst[i].vinfo.ProcessingCompleted, 2).ToString();
          }
       }
     }
     return completed_process;
  }


  [WebMethod]
  public static string GetInformation(string ProcessID)
  {
      var str = new StringBuilder();
      str.Append("<div class=\"item_pad_4\">\n");
      str.Append("<table class=\"table table-bordered table-striped\">\n");
      str.Append("<thead><tr>\n");
      str.Append("<th>Property</th>\n");
      str.Append("<th>Information</th>\n");
      str.Append("</tr></thead>\n");
      str.Append("<tbody>\n");
      if (_lst.Count > 0)
      {
         int i = 0;
         for (i = 0; i <= _lst.Count - 1; i++)
         {
            if (_lst[i].vinfo.ProcessID == ProcessID)
            {
                if (_lst[i].vinfo.ErrorCode > 0)
                {
                   // error occurs in processing
                   str.Append("<tr><td>Error Code</td><td>" + _lst[i].vinfo.ErrorCode + "</td></tr>\n");
                   str.Append("<tr><td>Error Message</td><td>" + _lst[i].vinfo.ErrorMessage + "</td></tr>\n");
                   str.Append("<tr><td>FFMPEG Output</td><td>" + _lst[i].vinfo.FFMPEGOutput + "</td></tr>\n");
                }
                else
                {
                   str.Append("<tr><td>Error Code</td><td>No Error Occured</td></tr>\n");
                }
                str.Append("<tr><td>File Name</td><td>" + _lst[i].vinfo.FileName + "</td></tr>\n");
                str.Append("<tr><td>Video Duration</td><td>" + _lst[i].vinfo.Duration + "(" + _lst[i].vinfo.Duration_Sec + " seconds)</td></tr>\n");
                str.Append("<tr><td colspan=\"2\">Output Values</td></tr>\n");
                if (_lst[i].vinfo.Vcodec != "")
                {
                   str.Append("<tr><td>Video Codec</td><td>" + _lst[i].vinfo.Vcodec + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Acodec != "")
                {
                   str.Append("<tr><td>Audio Codec</td><td>" + _lst[i].vinfo.Acodec + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Video_Bitrate != "")
                {
                   str.Append("<tr><td>Video Bitrate</td><td>" + _lst[i].vinfo.Video_Bitrate + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Audio_Bitrate != "")
                {
                   str.Append("<tr><td>Audio Bitrate</td><td>" + _lst[i].vinfo.Audio_Bitrate + "</td></tr>\n");
                }
                if (_lst[i].vinfo.SamplingRate != "")
                {
                   str.Append("<tr><td>Audio Sampling Rate</td><td>" + _lst[i].vinfo.SamplingRate + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Channel != "")
                {
                   str.Append("<tr><td>Audio Channel</td><td>" + _lst[i].vinfo.Channel + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Width > 0)
                {
                   str.Append("<tr><td>Width</td><td>" + _lst[i].vinfo.Width + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Height > 0)
                {
                   str.Append("<tr><td>Height</td><td>" + _lst[i].vinfo.Height + "</td></tr>\n");
                }
                if (_lst[i].vinfo.FrameRate != "")
                {
                   str.Append("<tr><td>Framerate</td><td>" + _lst[i].vinfo.FrameRate + "</td></tr>\n");
                }
                str.Append("<tr><td colspan=\"2\">Optional Information</td></tr>\n");
                if (_lst[i].vinfo.Producer != "")
                {
                   str.Append("<tr><td>Producer</td><td>" + _lst[i].vinfo.Producer + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Music != "")
                {
                   str.Append("<tr><td>Music</td><td>" + _lst[i].vinfo.Music + "</td></tr>\n");
                }
                if (_lst[i].vinfo.Footage != "")
                {
                   str.Append("<tr><td>Footage</td><td>" + _lst[i].vinfo.Footage + "</td></tr>\n");
                }
                if (_lst[i].vinfo.ProcessingCompleted >= 100)
                {
                   // remove from list of corrent processes if processes reach this point
                   // store all information of completed process and remove it from list of concurrent processes
                   // e.g
                   VideoInfo current_uploaded_video_info = _lst[i].vinfo;
                   _lst.Remove(_lst[i]);
                }
           }
       }
  }
  str.Append("</tbody>\n");
  str.Append("</table>\n");
  str.Append("</div>\n");
 return str.ToString();
}