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• use java-ffmpeg wrapper, or simply use java runtime to execute ffmpeg ?

  12 mars 2017, par user156153

  I’m pretty new to Java, need to write a program that listen to video conversion instructions and convert the video once an new instruction arrives (instructions is stored in Amazon SQS, but it’s irrelevant to my question)

  I’m facing a choice, either use Java RunTime to exec ’ffmpeg’ conversion (like from command line), or I can use a ffmpeg wrapper written inJava http://fmj-sf.net/ffmpeg-java/getting_started.php

  I’d much prefer using Java Runtime to exec ffmpeg directly, and avoid using java-ffmpeg wrapper as I have to learn the library. so my question is are there any benefits using java-ffmpeg wrapper over exec ffmpeg directly using Runtime ? I don’t need ffmpeg to play videos, just convert videos

  Thanks

• Issues with processing media on windows Azure

  23 septembre 2015, par Ahmed Mujtaba

  I have a website built on ASP.NET web forms that works as a media portal for users to upload videos. I’m using ffmpeg encoders to produce video contents to be streamed in the browser. I’m using the web deploy method to publish the site on the Azure server. The website get’s deployed properly however I get following issues in the live site.

  1. Video never get’s encoded and published. I get some sort of error.

  2. Video get’s published but the process of uploading and encoding the video is way too slow on the web server.

  My project solution contains upload.ashx that handles the upload requests and makes the call to encode.ashx which is responsible for the encoding and publishing of the videos. I tried to remotely debug the site but the debugger never get’s to encode.ashx.

  I was wondering if these issues can be resolved by having the website deployed with a VM ?

  Script that uploads the video file :

   var filesuploaded = 0;
  
      var faileduploaded = 0;
  
  
  
      $(function () {
  
          var uploader = new plupload.Uploader({
  
              runtimes: 'gears,html5,flash,silverlight,browserplus',
  
              browse_button: '<%= pickfiles.ClientID %>',
  
              container: 'container',
  
              max_file_size: '<%= MaxMediaSize %>mb',
  
              url: '<%=Config.GetUrl() %>videos/upload/upload.ashx',
  
              flash_swf_url: '<%=Config.GetUrl() %>plupload/js/plupload.flash.swf',
  
              silverlight_xap_url: '<%=Config.GetUrl() %>plupload/js/plupload.silverlight.xap',
  
              chunk_size: '4mb',
  
              <%= UniqueNames %>
  
              filters: [
  
              { title: '<%= AllowedFormatsDisplay %>', extensions: '<%= AllowedFormats %>'}],
  
              headers: { UName: '<%=UserName %>', MTP: '<%= MediaType %>' }
  
          });
  
          //uploader.bind('Init', function (up, params) {
  
          //    $('#filelist').html("<div>Current runtime: " + params.runtime + "</div>");
  
          //});
  
  
  
          uploader.init();
  
  
  
          $('#uploadfiles').click(function (e) {
  
              uploader.start();
  
              e.preventDefault();
  
              $("#uploadfiles").hide();
  
              $("#&lt;%= embd.ClientID %>").hide();
  
          });
  
  
  
          uploader.bind('FilesAdded', function (up, files) {
  
              $("#uploadfiles").show();
  
              $("#&lt;%= msg.ClientID %>").html("");
  
              var count=0;
  
              $.each(files, function (i, file) {
  
                  $('#filelist').append(
  
                      '<div class="item_pad_4 bx_br_bt">' + (count + 1) + ': ' + file.name + ' (' + plupload.formatSize(file.size) + ')  <b></b></div>' );
  
                  count++;
  
              });
  
              var maxupload = &lt;%= MaxVideoUploads %>;
  
              if(count > maxupload) 
  
              {               
  
                  $.each(files, function(i, file) {
  
                      uploader.removeFile(file);
  
                  });
  
  
  
                  $('#filelist').html("");
  
                  $("#uploadfiles").hide();
  
                  Display_Message("#&lt;%= msg.ClientID %>", "Can't upload more than " + maxupload + " records at once!", 1, 1);
  
                  return false;
  
              }
  
              else {
  
                  $("#tfiles").html(count);
  
                  $("#uploadfiles").removeClass("disabled");
  
                  $("#&lt;%= pickfiles.ClientID %>").hide();
  
              }
  
              up.refresh(); // Reposition Flash/Silverlight
  
          });
  
  
  
          uploader.bind('UploadProgress', function (up, file) {
  
              $('#' + file.id + " b").html(file.percent + "%");
  
          });
  
  
  
          uploader.bind('Error', function (up, err) {
  
              $('#filelist').append("<div>Error: " + err.code +
  
                  ", Message: " + err.message +
  
                  (err.file ? ", File: " + err.file.name : "") +
  
                  "</div>"
  
              );
  
              up.refresh(); // Reposition Flash/Silverlight
  
          });
  
  
  
          var failedstatus = 0;
  
          uploader.bind('FileUploaded', function (up, file, info) {
  
              // encode started
  
              if (info.response != "failed" &amp;&amp; info.response != "") {
  
                  EncodeVD(file.id, info.response, file.size);
  
                  Display_Message('#' + file.id, "Please wait for final processing", 0, 1);
  
                  if (failedstatus == 0)
  
                      Redirect(info.response);
  
                  filesuploaded++;
  
              }
  
              else {
  
                  Display_Message('#' + file.id, "Response is: " + info.response, 0, 1);
  
              }
  
          });
  
      });
  
      var redcnt = 0;
  
      function Redirect(filename) {
  
          var IntervalID = setInterval(function () {
  
              redcnt++;
  
              if (redcnt > 2) {
  
                  clearInterval(IntervalID);
  
                  var tfiles = $("#tfiles").html();
  
                  if(tfiles == faileduploaded) { // break further processing all videos failed to upload
  
                  }
  
                  else if (filesuploaded >= tfiles) {
  
                      document.location = "&lt;%=ConfirmPageUrl %>?fn=" + filename + "&amp;gid=&lt;%=GalleryID %>&amp;uvids=" + $("#tfiles").html() + "&amp;mpid=" + $("#maxpid").html().trim() + "&lt;%=GroupParam %>";
  
                  }
  
          }
  
          }, 2000);
  
  }
  
  function EncodeVD(mid, mfile, msize) {
  
      var params = '&lt;%= EncodingParams %>&amp;fn=' + mfile;
  
          $.ajax({
  
              type: 'GET',
  
              url: '&lt;%= Encoding_Handler_Path %>',
  
              data: params,
  
              async: true,
  
              success: function (msg) {
  
                  if (msg == "Success" || msg == "") {
  
                      $('#' + mid).html('<strong>Uploading Completed Successfully - Wait for Processing.');
  
                  }
  
                  else {
  
                      failedstatus = 1;
  
                      faileduploaded++;
  
                      Display_Message('#' + mid, "Response is: " + msg, 0, 1);
  
                  }
  
              }
  
          });
  
      }
  
  </strong>

  Server side code for processing the file upload :

   private int MediaType = 0; // 0 : video, 1: audio
  
  
  
      public void ProcessRequest (HttpContext context) {
  
          try
  
          {
  
              context.Response.ContentType = "text/plain";
  
              context.Response.Write(ProcessMedia(context));
  
          }
  
          catch (Exception ex)
  
          {
  
              context.Response.Write("error|" + ex.Message);
  
          }
  
      }
  
  
  
      public string ProcessMedia(HttpContext context)
  
      {
  
          if (context.Request.Files.Count > 0)
  
          {
  
              int chunk = context.Request["chunk"] != null ? int.Parse(context.Request["chunk"]) : 0;
  
              string fileName = context.Request["name"] != null ? context.Request["name"] : string.Empty;
  
              //string _fileName = fileName.Remove(fileName.LastIndexOf(".")) + "-" + Guid.NewGuid().ToString().Substring(0, 6) + "" + fileName.Remove(0, fileName.LastIndexOf("."));
  
              HttpPostedFile fileUpload = context.Request.Files[0];
  
  
  
              string upath = "";
  
              if (context.Request.Headers["UName"] != null)
  
                  upath = context.Request.Headers["UName"].ToString();
  
  
  
              //if (CloudSettings.EnableCloudStorage && upath != "")
  
              //    _fileName = upath.Substring(0, 3) + "-" + _fileName; // avoid duplication in cloud storage
  
  
  
              if (context.Request.Headers["MTP"] != null)
  
                  MediaType = Convert.ToInt32(context.Request.Headers["MTP"]);
  
  
  
              //string extensions = "";
  
              //if (MediaType == 0)
  
              //    extensions = Site_Settings.Video_Allowed_Formats;
  
              //else
  
              //    extensions = Site_Settings.Audio_Allowed_Formats;
  
  
  
              //bool sts = UtilityBLL.Check_File_Extension(extensions, fileName.ToLower());
  
              //if (sts == false)
  
              //{
  
              //    return "Invalid format, please upload proper video!"; // Invalid video format, please upload proper video
  
              //}
  
  
  
              int allowable_size_mb = 0;
  
              if (MediaType == 0)
  
              {
  
                  allowable_size_mb = Site_Settings.Video_Max_Size;
  
              }
  
              else
  
              {
  
                  allowable_size_mb = Site_Settings.Audio_Max_Size;
  
              }
  
              int UploadSize = allowable_size_mb * 1000000;
  
              if (fileUpload.ContentLength > UploadSize)
  
              {
  
                  return "Video Limit Exceeds";
  
              }
  
  
  
              string uploadPath = "";
  
              // check whether audio / mp3 encoding enabled
  
              if (this.MediaType == 1)
  
              {
  
                  // audio encoding
  
                  if (fileName.EndsWith(".mp3"))
  
                  {
  
                      // upload mp3 directly in mp3 path instead of default path
  
                      if (upath == "")
  
                          uploadPath = UrlConfig.MP3_Path(); // source video path
  
                      else
  
                          uploadPath = UrlConfig.MP3_Path(upath); // source video path
  
                  }
  
                  else
  
                  {
  
                      // default path
  
                      if (upath == "")
  
                          uploadPath = UrlConfig.Source_Video_Path(); // source video path
  
                      else
  
                          uploadPath = UrlConfig.Source_Video_Path(upath); // source video path
  
                  }
  
              }
  
              else
  
              {//azure
  
                  // default path
  
                  if (upath == "")
  
                      uploadPath = UrlConfig.Source_Video_Path(); // source video path
  
                  else
  
                      uploadPath = UrlConfig.Source_Video_Path(upath); // source video path
  
              }
  
  
  
              FileStream fs;
  
              using (fs = new FileStream(Path.Combine(uploadPath, fileName), chunk == 0 ? FileMode.Create : FileMode.Append))
  
              {
  
                  byte[] buffer = new byte[fileUpload.InputStream.Length];
  
                  fileUpload.InputStream.Read(buffer, 0, buffer.Length);
  
  
  
                  fs.Write(buffer, 0, buffer.Length);
  
              }
  
              return fileName; // "Success";
  
          }
  
          else
  
          {
  
              return "failed";
  
          }
  
  
  
          return "";
  
      }
  
      public bool IsReusable {
  
          get {
  
              return false;
  
          }
  
      }

  code in encode.aspx responsible for encoding the video :

  private string EncodeMedia(HttpContext context)
  
  {
  
      string sourcepath = "";
  
      string publishedpath = "";
  
      string mp3path = "";
  
      string thumbpath = "";
  
      if (this.UserName != "")
  
      {//azure
  
          sourcepath = UrlConfig.Source_Video_Path(this.UserName);
  
          publishedpath = UrlConfig.Published_Video_Path(this.UserName);
  
          mp3path = UrlConfig.MP3_Path(this.UserName);
  
          thumbpath = UrlConfig.Thumbs_Path(this.UserName);
  
      }
  
      else
  
      {
  
          sourcepath = UrlConfig.Source_Video_Path();
  
          publishedpath = UrlConfig.Published_Video_Path();
  
          mp3path = UrlConfig.MP3_Path();
  
          thumbpath = UrlConfig.Thumbs_Path();
  
      }
  
      if (this.FileName.EndsWith(".mp3") && this.MediaType == 1)
  
      {
  
          // mp3 and audio format
  
          if (!File.Exists(mp3path + "/" + this.FileName))
  
          {
  
              return "Audio file not found!";
  
          }
  
      }
  
      else
  
      {
  
          // rest normal video and audio encoding
  
          if (!File.Exists(sourcepath + "/" + this.FileName))
  
          {
  
              return "Source file not found!";
  
          }
  
      }
  
  
  
      if (CloudSettings.EnableCloudStorage && this.UserName != "")
  
          this.FileName = this.UserName.Substring(0, 3) + "-" + this.FileName; // avoid duplication in cloud storage
  
  
  
  
  
      //double f_contentlength = 0;
  
      //if (Site_Settings.Feature_Packages == 1)
  
      //{
  
      //    if (Config.GetMembershipAccountUpgradeType() != 1)
  
      //    {
  
      //        // Check whether user have enough space to upload content
  
      //        // Restriction only for normal or premium users
  
      //        f_contentlength = (double)fileUpload.ContentLength / 1000000;
  
      //        string media_field_name = "space_video";
  
      //        if (MediaType == 1)
  
      //            media_field_name = "space_audio";
  
      //        if (!User_PackagesBLL.Check_User_Space_Status(upath, media_field_name, f_contentlength) && !isAdmin)
  
      //        {
  
      //            // insufficient credits to upload content
  
      //            return "Insufficient credits to upload media file"; //   Response.Redirect(Config.GetUrl("myaccount/packages.aspx?status=" + media_field_name), true);
  
      //        }
  
      //    }
  
      //}
  
  
  
      this.backgroundpublishing = true; // should be true on direct encoding
  
      // Video Processing
  
      string flv_filename = "";
  
      string original_filename = "";
  
      string thumb_filename = "";
  
      string duration = "";
  
      int duration_sec = 0;
  
  
  
      // set video actions : 1 -> on, 0 -> off
  
      int isenabled = 1;
  
      int ispublished = 1;
  
      int isreviewed = 1;
  
      int isresponse = 0;
  
      if (Response_VideoID > 0)
  
          isresponse = 1;
  
  
  
      string flv_url = "none";
  
      string thumb_url = "none";
  
      string org_url = "none";
  
      string _embed = "";
  
  
  
      string errorcode = "0";
  
      VideoInfo info = null;
  
  
  
      if (Site_Settings.Content_Approval == 0)
  
          isreviewed = 0;
  
  
  
  
  
      // check whether audio / mp3 encoding enabled
  
      if (this.FileName.EndsWith(".mp3") && this.MediaType==1)
  
      {
  
          // audio encoding
  
          // mp3 file already
  
          // so no encoding happens
  
          MediaHandler _minfo = new MediaHandler();
  
          _minfo.FFMPEGPath = Encoding_Settings.FFMPEGPATH;
  
          _minfo.FileName = FileName;
  
          _minfo.InputPath = mp3path;
  
          info = _minfo.Get_Info();
  
  
  
          flv_filename = FileName;
  
          original_filename = FileName;
  
          duration = info.Duration;
  
          duration_sec = info.Duration_Sec;
  
          isenabled = 1; // enabled
  
      }
  
      else if (this.directpublishing)
  
      {            
  
  
  
          // publish video
  
          ArrayList itags = new ArrayList();
  
          MHPEncoder encoder = new MHPEncoder();
  
          //if (this.FileName.EndsWith(".mpeg") || this.FileName.EndsWith(".mpg")) // use mpg compatible ffmpeg encoder
  
          //    encoder.FfmpegPath = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath) + "\\ffmpeg\\ffmpegbk\\ffmpeg.exe";
  
              //encoder.ThumbFfmpegPath = Encoding_Settings.FFMPEGPATH; // use normal ffmpeg encoder for thumbs processing
  
  
  
          //azure
  
          encoder.FfmpegPath = Encoding_Settings.FFMPEGPATH; // use normal ffmpeg encoder
  
          encoder.FlvToolPath = Encoding_Settings.FLVTOOLPATH; // set meta information for flv videos
  
          encoder.Mp4BoxPath = Encoding_Settings.MP4BoxPath; // set meta information for mp4 videos
  
          encoder.SourcePath = sourcepath;
  
          encoder.SourceFileName = this.FileName;
  
  
  
          // No cloud storage on direct encoding
  
          //if (CloudSettings.EnableCloudStorage)
  
          //    encoder.EnableCloudStorage = true;
  
  
  
  
  
          if (MediaType == 1)
  
          {
  
              // audio encoding
  
              itags.Add("14");
  
              encoder.iTags = itags;
  
              encoder.GrabThumbs = false;
  
              encoder.PublishedPath = mp3path;
  
  
  
              //_vprocess.OutputPath = this.MP3Path;
  
              //_vprocess.isAudio = true;
  
          }
  
          else
  
          {
  
              // video encoding
  
              itags.Add(EncoderSettings.DefaultITagValue.ToString()); // 5 for 360p mp4 encoding    
  
              //itags.Add(7);   // this will call 7 case settings to publish next video ending with _7.mp4 instead of _5.mp4
  
              // so there will be 2 videos with different resoultions published at the end of the process?
  
              // yesmake sure use proper settings first test it directly via command.     
  
              //okay i got it. But i'm gonna have to use a different media players to incroporate those settings
  
              // once published you can load different videos for different user by checking _7.mp4 (end) va
  
             //okay got it.
  
  
  
              //azure
  
              encoder.PublishedPath = publishedpath;
  
              encoder.iTags = itags;
  
              encoder.ThumbsDirectory = thumbpath;
  
              encoder.TotalThumbs = 15;
  
  
  
              //_vprocess.ThumbPath = this.ThumbPath;
  
              //_vprocess.OutputPath = this.FLVPath;
  
              //if (Config.isPostWaterMark())
  
              //{
  
              //    // script for posting watermark on video
  
              //    _vprocess.WaterMarkPath = Server.MapPath(Request.ApplicationPath) + "\\contents\\watermark";
  
              //    _vprocess.WaterMarkImage = "watermark.gif";
  
  
  
              //}
  
          }
  
          int deleteoption = Site_Settings.Video_Delete_Original;
  
          if (deleteoption == 1)
  
          {
  
              encoder.DeleteSource = true;
  
          }
  
          // background processing
  
          if (this.backgroundpublishing && this.MediaType==0)
  
          {
  
              encoder.BackgroundProcessing = true;
  
              // get information from source video in order to store it in database
  
              MediaHandler _minfo = new MediaHandler();
  
              //if (this.FileName.EndsWith(".mpeg") || this.FileName.EndsWith(".mpg")) // use mpg compatible ffmpeg encoder
  
              //    encoder.FfmpegPath = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath) + "\\ffmpeg\\ffmpegbk\\ffmpeg.exe";
  
              //else
  
                  _minfo.FFMPEGPath = Encoding_Settings.FFMPEGPATH;
  
  
  
              _minfo.FileName = FileName;
  
              _minfo.InputPath = sourcepath;
  
              info = _minfo.Get_Info();
  
          }
  
          // encode video processing
  
          Video_Information vinfo = encoder.Process();
  
          if (vinfo.ErrorCode > 0)
  
          {
  
              errorcode = vinfo.ErrorCode.ToString();
  
              ErrorLgBLL.Add_Log("Encoding Failed Log", "", "encoding error: " + vinfo.ErrorCode.ToString() + "<br />Description: " + vinfo.ErrorDescription.ToString());
  
               //return vinfo.ErrorDescription;
  
          }
  
          // Double check validation
  
          // if published video exist
  
          // if thumb exist
  
          // then proceed further
  
  
  
          if (MediaType == 0)
  
          {
  
              if (!File.Exists(encoder.PublishedPath + "/" + vinfo.FLVVideoName))
  
              {
  
                  return "Video failed to published properly.";
  
              }
  
              if (!File.Exists(encoder.ThumbsDirectory + "/" + vinfo.ThumbFileName))
  
              {
  
                  return "Thumbs failed to grab from video properly.";
  
              }
  
          }
  
          else
  
          {
  
              if (vinfo.FLVVideoName == "")
  
              {
  
                  vinfo.FLVVideoName = this.FileName.Remove(this.FileName.LastIndexOf(".")) + "_14.mp3"; // mp3 file path name
  
              }
  
              if (!File.Exists(encoder.PublishedPath + "/" + vinfo.FLVVideoName))
  
              {
  
                  return "Audio failed to published properly.";
  
              }
  
          }
  
          // Now thumbs and video published, procceed for data processing
  
          // get information from vinfo object
  
          if (this.backgroundpublishing &amp;&amp; this.MediaType == 0)
  
          {
  
              string OutputFileName = this.FileName.Remove(this.FileName.LastIndexOf("."));
  
              flv_filename = OutputFileName + "_" + EncoderSettings.DefaultITagValue + "." + EncoderSettings.Return_Output_Extension(EncoderSettings.DefaultITagValue);
  
              original_filename = vinfo.OriginalVideoName;
  
              thumb_filename = OutputFileName + "_008.jpg"; // info.ThumbFileName;
  
              duration = info.Duration;
  
              duration_sec = info.Duration_Sec;
  
          }
  
          else
  
          {
  
              flv_filename = vinfo.FLVVideoName;
  
              original_filename = vinfo.OriginalVideoName;
  
              thumb_filename = vinfo.ThumbFileName;
  
              duration = vinfo.Duration;
  
              duration_sec = vinfo.Duration_Sec;
  
              isenabled = vinfo.isEnabled;
  
          }
  
  
  
          // No cloud storage on direct encoding.
  
          // Note cloude storage only works if background processing is disabled
  
          // Or works in cased of sheduled processing
  
          if (CloudSettings.EnableCloudStorage &amp;&amp; errorcode == "0")
  
          {
  
              flv_url = "amazon";
  
              org_url = "https://s3.amazonaws.com/" + CloudSettings.OriginalVideoBucketName + "/" + this.FileName;
  
              thumb_url = "https://s3.amazonaws.com/" + CloudSettings.ThumbsBucketName + "/" + thumb_filename;
  
  
  
          }
  
  
  
      }
  
      else
  
      {
  
          // set publishing status off.
  
          ispublished = 0;
  
          original_filename = this.FileName;
  
      }
  
  
  
      // Store video information in database
  
      string ipaddress = context.Request.ServerVariables["REMOTE_ADDR"].ToString();
  
  
  
      // Store media information in database
  
      Video_Struct vd = new Video_Struct();
  
      vd.CategoryID = 0; // store categoryname or term instead of category id
  
      vd.Categories = Categories;
  
      vd.UserName = UserName;
  
      vd.Title = "";
  
      vd.Description = "";
  
      vd.Tags = Tags;
  
      vd.Duration = duration;
  
      vd.Duration_Sec = duration_sec;
  
      vd.OriginalVideoFileName = original_filename;
  
      vd.VideoFileName = flv_filename;
  
      vd.ThumbFileName = thumb_filename;
  
      vd.isPrivate = Privacy;
  
      vd.AuthKey = PAuth;
  
      vd.isEnabled = isenabled;
  
      vd.Response_VideoID = Response_VideoID; // video responses
  
      vd.isResponse = isresponse;
  
      vd.isPublished = ispublished;
  
      vd.isReviewed = isreviewed;
  
      vd.FLV_Url = flv_url;
  
      vd.Thumb_Url = thumb_url;
  
      vd.Org_Url = org_url;
  
      vd.Embed_Script = _embed;
  
      vd.isExternal = 0; // website own video, 1: embed video
  
      vd.IPAddress = ipaddress;
  
      vd.Type = MediaType;
  
      vd.YoutubeID = "";
  
      vd.isTagsreViewed = 1;
  
      vd.Mode = 0; // filter videos based on website sections
  
      //vd.ContentLength = f_contentlength;
  
      vd.GalleryID = GID;
  
      vd.ErrorCode = Convert.ToInt32(errorcode);
  
      long videoid = VideoBLL.Process_Info(vd, false);
  
  
  
      // Process tags
  
      if (Tags != "")
  
      {
  
          int tag_type = 0; // represent videos
  
          if (MediaType == 1)
  
              tag_type = 4; // represent audio file
  
          TagsBLL.Process_Tags(Tags, tag_type, 0);
  
      }
  
  
  
      if (Response_VideoID > 0)
  
      {
  
          VideoBLL.Update_Responses(Response_VideoID);
  
      }
  
  
  
      return "Success";
  
  }

• ffmpeg - Record Server Desktop Without Connection

  2 septembre 2015, par Chris.

  I set up an application which uses ffmpeg to record a desktop on an Amazon AWS EC2 instance having Windows Server 2012 R2 installed. It records the desktop and puts the result into a file.

  This works as long as a Remote Desktop or TeamViewer connection is active for that particular Amazon AWS EC2 instance. As soon as I close the Remote Desktop and TeamViewer connection the recording stops and continues as soon as I reconnect.

  I assume that it’s because the GPU doesn’t deliver frames without a display in use.

  How can I make sure that frames are constantly being rendered so that I can record them ?