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• Perspective transformations

  4 février 2009, par Mikko Koppanen — Imagick, PHP stuff

  Finally (after a long break) I managed to force myself to update the PHP documentation and this time it was distortImage code example. Things have been hectic lately but that does not quite explain the 6 months(?) break between this and the previous post. As a matter of a fact there is no excuse for such a long silence so I will try to update this blog a bit more often from now on.

  Back in the day I used to blog the examples and update the documentation if I remembered but I am trying to fix this bad habit. Most of the latest examples have been updated in to the manual. In the case of the two last examples I updated the documentation first and then blogged on the subject.

  I took some time to actually understand the perspective transformations properly using the excellent ImageMagick examples (mainly created by Anthony Thyssen) as a reference. The basic idea of perspective distortion seems simple : to distort the control points to new locations. Grabbing the syntax for Imagick was easy, an array of control point pairs in the form of :

  php

  < view plain text >

  1. array(source_x, source_y, dest_x, dest_y ... )

  The following example uses the built-in checkerboard pattern to demonstrate perspective distortion :

  php

  < view plain text >

  1. < ?php
  2. /* Create new object */
  3. $im = new Imagick() ;
  4.  
  5. /* Create new checkerboard pattern */
  6. $im->newPseudoImage(100, 100, "pattern:checkerboard") ;
  7.  
  8. /* Set the image format to png */
  9. $im->setImageFormat(’png’) ;
  10.  
  11. /* Fill background area with transparent */
  12. $im->setImageVirtualPixelMethod(Imagick: :VIRTUALPIXELMETHOD_TRANSPARENT) ;
  13.  
  14. /* Activate matte */
  15. $im->setImageMatte(true) ;
  16.  
  17. /* Control points for the distortion */
  18. $controlPoints = array( 10, 10,
  19.             10, 5,
  20.  
  21.             10, $im->getImageHeight() - 20,
  22.             10, $im->getImageHeight() - 5,
  23.  
  24.             $im->getImageWidth() - 10, 10,
  25.             $im->getImageWidth() - 10, 20,
  26.  
  27.             $im->getImageWidth() - 10, $im->getImageHeight() - 10,
  28.             $im->getImageWidth() - 10, $im->getImageHeight() - 30) ;
  29.  
  30. /* Perform the distortion */ 
  31. $im->distortImage(Imagick: :DISTORTION_PERSPECTIVE, $controlPoints, true) ;
  32.  
  33. /* Ouput the image */ 
  34. header("Content-Type : image/png") ;
  35. echo $im ;
  36.  ?>

  Here is the source image :
  

  And the result :
  

• How to configure FFMPEG in PHP 5.2.17 and IIS 7 environment

  29 mars 2014, par KRA

  I have working PHP 5.2.17 (thread safe) in IIS 7 / Windows 7.

  I want to setup FFMPEG in my local server.

  I downloaded php ext from this link : 1.html">http://www.4shared.com/zip/YZkvqY6v/ffmpeg-php-win32-all_1.html

  Then I followed this tutorial : http://blog.halomede.com/2009/03/ffmpeg-php-installation-on-windows.html

  But ffmpeg is not displaying in phpinfo() ; as they mentioned in tutorial.

  Can you please let me know what wrong I am doing ? It will be very helpful.

  Thank you,

• How to convert .flv file to .3gp using ffmpeg ? [migrated]

  19 octobre 2011, par Chetana

  I have converted any video format to 3gp file format using ffmpeg on one server.
  But on another server it not works.

  Following is my script :

  exec("ffmpeg -i test.flv -sameq -acodec libmp3lame -ar 22050 -ab 96000
  
      -deinterlace -nr 500 -s 320x240 -aspect 4:3 -r 20 -g 500 -me_range 20
  
      -b 270k -deinterlace -f flv -y test.3gp ");

  Can anyone tell me what is wrong in script ?

  Following is my ffmpeg setting :

  root@ninja [ ]# ffmpeg -formats
  ffmpeg version CVS, build 3277056, Copyright (c) 2000-2004 Fabrice Bellard
  configuration : —enable-mp3lame —enable-libogg —enable-gpl —disable-mmx
  —enable-shared
  built on Jun 17 2009 10:51:43, gcc : 4.1.2 20080704 (Red Hat 4.1.2-44)