Recherche avancée

Sur d’autres sites (5915)

• FFMpeg + Beanstalk : How to pass the processes to it

  14 juillet 2012, par Ilia Rostovtsev

  I'm working around on the video web site ! I have a simple PHP function that is used to start complicated conversion processes. The problem is that FFMpeg and Mencoder are extremely resourceful and having one process of it is something that makes httpd slow down but multiple processes just hang it completely. I want to my conversion processes with Beanstalk (or anything else). Everything is working well right now : converting, logging and etc.

  My concrete question is : How to transfer my current jobs to Beanstalk ?

  I have very simple PHP code :

  RunInBackground('convert.php', array($initial_file_name, $vid), $LogFilePath);

  And the function looks also quite clear :

  function RunInBackground($sPHPFile, $aParam = array(), $sLogFile = '')
  
  {
  
      global $config;
  
  
  
      $sCmd = $config['phppath'] . ' ' . $config['BASE_DIR'] . '/' . $sPHPFile;
  
      foreach ($aParam as $s)
  
      {
  
          $sCmd .= ' ' . $s;
  
      }
  
  
  
  
  
          $sCmd .= ' > ' . ($sLogFile != '' ? $config['BASE_DIR'] . '/' . $sLogFile : '/dev/null');
  
  
  
          if ( iBgProc($sCmd) )
  
          {
  
              return true;
  
          }
  
          else
  
          {
  
              return false;
  
          }
  
  
  
  }
  
  
  
  function iBgProc($sCmd, $iPrio = 0)
  
  {
  
      if ($iPrio)
  
      {
  
          $iPID = shell_exec("nohup nice -n $iPrio $sCmd 2> /dev/null & echo $!");
  
      }
  
      else
  
      {
  
          $iPID = shell_exec("nohup $sCmd 2> /dev/null & echo $!");
  
      }
  
  
  
      return($iPID);
  
  }

  Now what would Beanstalk correct code would look like so these processes would NOT start all at the same time if multiple videos are uploaded ?

  If you believe that for my needs is better to use something else but Beanstalk and you know how to implement it, I would be still happy to see it !

  Thanks !

• Will ffmpeg transcoding change the media's duration ?

  6 juillet 2012, par MaiTiano

  For example, I have a example flv media : 1775818137_1775828481_10344.flv. Only audio data has contained in it. (No video data)

  The major properties of this flv are :

  _____________________________________________________________________
  
  Format                                   : Flash Video
  
  
  
  File size                                : 87.4 KiB
  
  
  
  Duration                                 : 494 hours
  
  
  
  Overall bit rate mode                    : CBR
  
  
  
  Overall bit rate                         : 0 bps
  
  
  
  Writing application                      : Lavf53.4.0
  
  
  
  Audio
  
  
  
  Format                                   : MPEG Audio
  
  
  
  Format version                           : Version 1
  
  
  
  Format profile                           : Layer 3
  
  
  
  Mode                                     : Joint stereo
  
  
  
  Mode extension                           : MS Stereo
  
  
  
  Codec ID                                 : 2
  
  
  
  Codec ID/Hint                            : MP3
  
  
  
  Duration                                 : 49hours
  
  
  
  Bit rate mode                            : CBR
  
  
  
  Bit rate                                 : 64.0 Kbps
  
  
  
  Channel(s)                               : 2 channels
  
  
  
  Sampling rate                            : 44.1 KHz
  
  
  
  Compression mode                         : Lossy
  
  
  
  Stream size                              : 13.3 GiB
  
  
  
  _____________________________________________________________________

  Because this is the flv piece generated from the Suse10.0 server, the timestamp may be not correctly wrote into the flv metadata. Therefore, the Duration item listed above is not the real time of it.
  I has record the time in its file name.
  So, the beginning time is 1775818137 ms
  the ending time of this flv is 1775828481 ms
  The actual duation of this flv is 10344 ms which is about 10 seconds.

  **HERE IS MY QUESTION -.- **

  When I use ffmpeg to transcode flv fromat into ts format, like this,

  ./ffmpeg -i 1775818137_1775828481_10344.flv -f mpegts -vn -acodec libfaac -ar 44100 -ab 48k 1775818137_1775828481_10344.ts

  Is there possibility that the duration of final gotten ts file is not equal to the duation of original flv file ? In other words, the ts file's duration is not 10344ms.

• FFMPEG best practice ?

  26 avril 2013, par HighFlyingFantasy

  I'm trying to write a wrapper class for FFMPEG. I have 4 classes within the wrapper, Stream, Demux, Encode, Decode. All of these classes use avcodec, avformat, etc. My question is, can I use the avcodec_register_all, av_register_all and avformat_network_init in my top level wrapper after initializing the lower level classes, or should I call each one individually in the lower level init methods ?