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• Improve ffmpeg CPU usage by compromising quality

  29 septembre 2016, par Hardik Juneja

  I am using FFMpeg for screen capturing.
  I am looking for a screen capturing tool that will run on 1000 of VMs (windows and mac).The VMs have limited CPU (1 core) and 2GB ram and No GPU.

  Currently I invoke ffmpeg with

  ffmpeg  -y -framerate 8 -f dshow -f gdigrab -i "desktop"  -c:v libx264  -crf 0 -preset ultrafast -threads 0 temp.mkv

  I am using gdigrab to capture screen ? Is there any better options that might reduce cpu usage ? or changing the encoder or format ?

  I am aiming for 4-5% reduction in CPU usage.

  Thanks in advance

• ffmpeg fails on conversion from .mov to .mp4 fails aT 98%

  3 avril 2013, par user2241249

  Our code is below. When converting a uploaded .mov to .mp4 the conversion halts at 98%.

  Almost all of our other preferred formats encode flawlessly. Anyone has any clue on where we went wrong ? We are struggling on this for a while now so we want to ask the experts, thanks in advance for any help.

  <?php
  
  $Path = dirname(__FILE__) . "/";
  
  $url = "http://" . $_SERVER['SERVER_NAME'] . str_replace('\\', '/', dirname($_SERVER['SCRIPT_NAME'])) . "/";
  
  
  
  session_start();
  
  include_once 'inc/config.inc.php';
  
  include_once 'common.php';
  
  include_once 'inc/ffmpegprogressbar.class.php';
  
  
  
  ob_flush();
  
  ?>
  
  
  
  
  
      
  
      
  
      <?php
  
  
  
  // Specifie Inputfile for FFMPEG
  
      $count = count($_SESSION['Files']);
  
  // $file  = array_pop($_SESSION['Files']);
  
  
  
      $FileInstance = array_pop($_SESSION['Files']);
  
      //$FileInstance = $_SESSION['Files'][0];
  
      $file = $FileInstance['FileName'];
  
      $passNeeded = $FileInstance['PassNeeded'];
  
      $fmt = $FileInstance['fmt'];
  
  
  
      $FFMPEGInput = $Path . 'data/' . $_SESSION['OldSession'] . "/" . $file;
  
  
  
      $timeUnique = time();
  
      //echo "Start:Session holds: ".$_SESSION["cstatus"].", cstatus var =   $cstatus";
  
  
  
  
  
    /*  if ($FileInstance['PassNeeded'] == 5) {
  
          $FFMPEGParams = "-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 1920x1080";
  
      } else if ($FileInstance['PassNeeded'] == 4) {
  
          $FFMPEGParams ="-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 1280x720";
  
      } else if ($FileInstance['PassNeeded'] == 3) {
  
          $FFMPEGParams = "-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 854x480";
  
      } else if ($FileInstance['PassNeeded'] == 2) {
  
          $FFMPEGParams = "-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 640x360";
  
      }
  
      */
  
  if($fmt=="flv"){
  
  if ($FileInstance['PassNeeded'] == 5) {
  
          $FFMPEGParams = "-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 1920x1080";
  
      } else if ($FileInstance['PassNeeded'] == 4) {
  
          $FFMPEGParams ="-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 1280x720";
  
      } else if ($FileInstance['PassNeeded'] == 3) {
  
          $FFMPEGParams = "-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 854x480";
  
      } else if ($FileInstance['PassNeeded'] == 2) {
  
          $FFMPEGParams = "-r 1000 -ar 11025 -ab 32 -f $fmt -sameq -g 15 -s 640x360";
  
      }
  
  }elseif($fmt=="mp4"){
  
  $FFMPEGParams = " -pix_fmt yuv420p -s 640x360";
  
  
  
  }elseif($fmt=="ogv"){
  
  $FFMPEGParams = " -acodec libvorbis -ac 2 -ab 96k -ar 44100 -b 125k -s 640x360";
  
  
  
  }elseif($fmt=="webm"){
  
  $FFMPEGParams = " -acodec libvorbis -ac 2 -ab 96k -ar 44100 -b 125k -s 640x360";
  
  //}elseif($fmt!==""){
  
  //-i %1 -s qvga -acodec libfaac -ar 22050 -ab 128k -vcodec libx264 -threads 0 -f   ipod %2
  
  //-vcodec mpeg4 -acodec aac output.mp4
  
  //$FFMPEGParams = "-r 20 -ar 44100 -ab 196 -f $fmt -s 480x351";
  
  }
  
      if ($FileInstance['PassNeeded'] > 2) {
  
          $FileInstance['PassNeeded'] = $FileInstance['PassNeeded'] - 1;
  
          array_unshift($_SESSION['Files'], $FileInstance);
  
      }
  
  
  
      $flv_rpath = 'data/' . $_SESSION['OldSession'] . "/" . $file. $timeUnique . ".".$fmt;
  
  
  
       $FFMPEGOutput = $FFMPEGInput . $timeUnique . ".$fmt";
  
  
  
      $_SESSION['ConvertedFiles'][$file][] = array('Pass' => $passNeeded, 'OutFile' => $file . $timeUnique . ".$fmt","fmt"=>$fmt);
  
  
  
  
  
  
  
      if (!$_GET["pkey"]) {
  
          $pkey = rand();
  
      } elseif (file_exists('log/' . $_GET["pkey"] . '.ffmpeg')) {
  
          $pkey = $_GET["pkey"];
  
      } else {
  
          $pkey = rand();
  
      }
  
  
  
  // initializing and create ProgressBar
  
      flush();
  
      $FFMPEGProgressBar = &new FFMPEGProgressBar();
  
      flush();
  
  // Show Progressbar
  
      if ($count > 0) {
  
          if ($FileInstance['PassNeeded'] < 3) {
  
          define('FFMPEG_LIBRARY', '/usr/local/bin/ffmpeg ');
  
          $extension = "ffmpeg";
  
          $extension_soname = $extension . "." . PHP_SHLIB_SUFFIX;
  
          $extension_fullname = PHP_EXTENSION_DIR . "/" . $extension_soname;
  
              if (!extension_loaded($extension)) {
  
                  dl($extension_soname) or die("Can't load extension $extension_fullname\n");
  
              }
  
              exec(FFMPEG_LIBRARY . " -y -i '" . $FFMPEGInput . "' -vframes 1 -ss 00:00:03 -an -vcodec png -f rawvideo -s 160x90 '$FFMPEGInput.png'");
  
          }
  
          $FFMPEGProgressBar->Show($pkey, $count, $url, $passNeeded, $file, $timeUnique,$fmt);
  
          if (!$_GET["pkey"] || !file_exists('log/' . $_GET["pkey"] . '.ffmpeg')) {
  
              flush();
  
              $FFMPEGProgressBar = &new FFMPEGProgressBar();
  
              flush();
  
              @$FFMPEGProgressBar->execFFMPEG($FFMPEGInput, $FFMPEGOutput, $FFMPEGParams, $pkey);
  
  
  
              flush();
  
              $_SESSION['new_space']["video"] = 'data/' . $_SESSION['OldSession'] . "/" . $file;
  
              $_SESSION['new_space']["{$FileInstance['name']}"] = $flv_rpath;
  
              $_SESSION['new_space']["session"] =   $_SESSION['OldSession'];
  
          }
  
      //echo "End:Session holds: ".$_SESSION["cstatus"].", cstatus var = $cstatus";
  
      } else {
  
  //  header("Location: $url" . "index.php" );
  
          echo "<code class="echappe-js">&lt;script type=\&quot;text/javascript\&quot;&gt;window.location.href=&amp;#39;&quot; . $url . &quot;&amp;#39;;&lt;/script&gt;
  No Input" ;
  
      }
  
  // ShowProgressbar
  
   ?>
  
  
  

• Improve ffmpeg CPU usage by compromising quality

  29 septembre 2016, par Hardik Juneja

  I am using FFMpeg for screen capturing.
  I am looking for a screen capturing tool that will run on 1000 of VMs (windows and mac).The VMs have limited CPU (1 core) and 2GB ram and No GPU.

  Currently I invoke ffmpeg with

  ffmpeg  -y -framerate 8 -f dshow -f gdigrab -i "desktop"  -c:v libx264  -crf 0 -preset ultrafast -threads 0 temp.mkv

  I am using gdigrab to capture screen ? Is there any better options that might reduce cpu usage ? or changing the encoder or format ?

  I am aiming for 4-5% reduction in CPU usage.

  Thanks in advance