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• Sub-pixel rendering with imagettftext()

  8 mars 2016, par user1661677

  I’m creating an image sequence, and encoding it to a video using PHP, GD library and ffmpeg. You’ll see I’m animating the two text layers inversely of each other, on the X axis. And with some simple operators $i/2 and $i/3, I’m trying to make their movement slower in the final animation.

  The problem I’m having is that when the video is rendered out, each layer’s text is only moving ever second, and third frame, respectively. This causes the animation to be a bit ’jerky’ and just not as smooth as Adobe After Effects with it’s ability to support sub-pixel rendering of elements.

  Is there any way to get imagettftext(), or some other method of drawing on images to support sub-pixel rendering ?

  Thank you.

  for ($i = 1; $i <= 125; $i++) {
  
  
  
      // Text on Image
  
      $front = imagecreatefromjpeg('front.jpg');
  
      $white = imagecolorallocate($front, 255, 255, 255);
  
      $text = 'some text';
  
      $text2 = 'some other text';
  
      $font = '/var/www/html/test/OpenSans-Bold.ttf';
  
  
  
      // Add text
  
      imagettftext($front, 60, 0, 1340-($i/2), 720, $white, $font, $text);
  
      imagettftext($front, 35, 0, 1240+($i/3), 800, $white, $font, $text2);
  
  
  
      // Write image to file
  
      imagejpeg($front, "images/".$i.".jpg", 100);
  
  }

• Don't work some keys of coding in FFmpeg

  17 décembre 2015, par Plush

  <?
  
      // $videoPath — path to the video file
  
      // $newVideoPath — path of the resultant video file
  
  
  
      exec('/usr/bin/ffmpeg -i ' . $videoPath . ' -vcodec libx264 -profile high -level 3.1 -s 1280x720 -sar 1:1 -aspect 16:9 -b:v 3800K -dct8x8 1 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -refs 5 -fast-pskip 0 -subq 9 -me_method full -me_range 32 -mbd rd -flags +mv4+qpel -g 40 -keyint_min 4 -bf 2 -direct-pred 1 -b_strategy 2 -b-pyramid 1 -weightb 1 -weightp 2 -coder 1 -qmin 0 -qdiff 1 -acodec libfaac -ac 2 -ar 48000 -ab 192K ' . $newVideoPath);

  I defined keys which don’t work :
  - dct8x8 1 - partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 (coding of video doesn’t work)
  - me_method full (the video file is coded, but it isn’t started in a player)
  FFmpeg version : 1.2.6

  How to involve an adaptive method of transformations 8x8 in an I-shot and to set a method of an assessment of the movement of full pixel as full ?

• Piwik analytics database : migrating from MySQL to MariaDB

  11 novembre 2015, par Piwik Core Team — Meta

  This short blog post is an announcement regarding the Piwik technology stack.

  Piwik compatible with MySQL and MariaDB

  Since our first public release Piwik uses the open source database server MySQL to store the analytics data.

  Piwik is also compatible with MariaDB. MariaDB is an enhanced, drop-in replacement for MySQL.

  Upgrading to MariaDB

  Many users from our community as well as Piwik Scalability Experts have confirmed that using MariaDB for Piwik has several advantages. MariaDB has in some cases significantly improved query performance and reliability of Piwik. Because MariaDB 5.5 is a complete drop-in-replacement for MySQL 5.5, upgrading can be as easy as running apt-get install mariadb-server (or equivalent for your platform). Existing third party techologies such as TokuDB (FAQ) and Galera are fully compatible with MariaDB.

  Learn more about upgrading to MariaDB : Upgrading from MySQL to MariaDB

  In the future, Piwik will stay compatible with both MySQL and MariaDB.