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• Using FFMpeg with Runtime.exec() to do a simple transcoding

  1er novembre 2011, par Adam Ingmansson

  I know there are many questions touching this subject, but none have helped me solve my issue.

  Purpose :

  Transcoding a video taken,from a queue, from .mov to h.264 (for now only that)

  Solution :

  Building a java application that gets the next in the queue, transcodes it then repeat

  Problem :

  Running ffmpeg using Runtime.exec() is not working.
  Im using the StreamGobbler from this tutorial to capturing the output from the process.

  This code shows how i start my process :

  String[] command = new String[]{"./ffmpeg/ffmpeg","-i",videoFile.getPath(),"-vcodec","libx264","-fpre",preset,folder + recID + ".flv"};
  
  System.out.println("Running command..");
  
  Process p = r.exec(command);
  
  
  
   // any error message?
  
  StreamGobbler errorGobbler = new 
  
  StreamGobbler(p.getErrorStream(), "ERROR");            
  
  
  
  // any output?
  
  StreamGobbler outputGobbler = new 
  
  StreamGobbler(p.getInputStream(), "OUT");
  
  
  
  // kick them off
  
  errorGobbler.start();
  
  outputGobbler.start();
  
  
  
  //logProcessOutputAndErrors(p);
  
  
  
  int res = p.waitFor();
  
  if (res != 0) {
  
      throw new Exception("Encoding error: "+String.valueOf(res));
  
  }

  and this is the current modified version of StreamGobbler (the important part)

  InputStreamReader isr = new InputStreamReader(is);
  
  BufferedReader br = new BufferedReader(isr);
  
  String line=null;
  
  int c = 0;
  
  StringBuilder str = new StringBuilder();
  
  
  
  while (true) {
  
      c = br.read();
  
  }

  Sometimes ffmpeg just stalls, maybe waiting for my input (although there is no indication on screen).

  Sometimes it just ends.

  Sometimes (when I added the line "System.out.print((char) c) ;" in the while-loop above) i got loads of "¿¿ï" repeated over and over again, wich might be the actual encoding of the video wich I managed to capture instead of to a file.

  For those who wonders why i dont just go with a commandline or maybe even php :

  The purpose is an application that will run 24/7 transcoding anything and everything from a queue. The files are pretty large to begin with and takes about 15 min to transcode.

• Anomalie #3347 : Barre d’outils absente en pleine écran

  20 novembre 2014, par Franck Dalot

  hello :-)
  http://zone.spip.org/trac/spip-zone/changeset/86183/_core_/plugins/porte_plume
  Fait bien de nouveau apparaitre la barre d’outils, mais par contre, il reste toujours le 2eme problème, à savoir :

  Si on clique sur l’onglet "plein écran", puis que l’on en sort via la touche "echap" du clavier par exemple.
  L’adresse de la page dans le navigateur fait toujours apparaitre #fullscreen
  Chose qui n’est pas normal car le passage de #previsuVoir à #previsuEditer est "invisible", alors que le passage de #fullscreen à #previsuEditer ne l’ai pas car il fait apparaitre :
  .../ecrire/ ?exec=article_edit&new=oui#fullscreen
  et non :
  .../ecrire/ ?exec=article_edit&new=oui

  Si l’on clique sur l’onglet "voir", cela ne change rien, #fullscreen reste apparent dans la barre de navigation du navigateur
  Franck

• Percentage transcoded never goes past 65% php-ffmpeg

  22 février 2016, par K Ф

  Edit

  After some tests it would appear that this bug has something to do directly with the clipped video. If I take 100% of the video, then the percentage transcoded goes up to 100%. If I take only 30% of the video, then the percentage transcoded goes up tot 64-65%.

  Introduction

  I’m using https://github.com/PHP-FFMpeg/PHP-FFMpeg for my symfony3 project. Installed via composer.

  When the video is done transcoding (when the transcodage percentage reaches 100%) I would like to start another type of operation on the video I just created.

  Problems

  However, it would appear that I never get to 100% when I clip a video. It seems to stop at 65% every time.

      $format->on('progress', function ($video, $format, $percentage) use ($videoExportPath, $temporary_video_path) {
  
          //This part never goes past 65%...
  
          dump("$percentage % transcoded");
  
          if($percentage == 100) {
  
              //never enters this part..
  
              dump("$percentage % transcoded");
  
              $video = $this->ffmpeg->open($videoExportPath);
  
              $filterConcat = new ConcatVideoFilter();
  
              $filterConcat->addFile($temporaryVideoPath);
  
              dump("second video...");
  
              $video
  
                  ->addFilter($filterConcat)
  
                  ->save($this->createNewMP4Format(), $videoExportPath);
  
          }
  
      });

  I’ve looked at the lib to see what is causing this but unfortunately I can not find any indication. The X264 format extends to the DefaultVideo class where the progress listeners are created. Here is the exact function that does that.

  public function createProgressListener(MediaTypeInterface $media, FFProbe $ffprobe, $pass, $total)
  
  {
  
      $format = $this;
  
      $listeners = array(new VideoProgressListener($ffprobe, $media->getPathfile(), $pass, $total));
  
  
  
      foreach ($listeners as $listener) {
  
          $listener->on('progress', function () use ($format, $media) {
  
             $format->emit('progress', array_merge(array($media, $format), func_get_args()));
  
          });
  
      }
  
  
  
      return $listeners;
  
  }

  Questions

  And yes the first video I want to create actually gets clipped correctly. Does clipping a video (reducing the length of a video) have something to do with the transcoding percentage to never reach 100% ?

  Is there a more elegant way to know when a video is done transcoding ?

  ---

  https://github.com/PHP-FFMpeg/PHP-FFMpeg/issues/201