[TYPO3-core] RFC #13283: Thumbnail generation broken for PDF files

[Benjamin Mack]

Hey team,

this is a SVN patch request.

Type: bugfix

Branch: 4.3, trunk

BT reference: http://bugs.typo3.org/view.php?id=13283

Problem:
Due the patch with report 0012341, the generation of thumbnails for PDF 
files does not work anymore. The problem is the missing frame parameter 
in the GraphicsMagick call.

The following line was added in the function imageMagickExec ( 
t3lib/class.t3lib_stdgraphic.php):

$frame = $frame ? '['.intval($frame).']' : '';

This means the frame parameter will not be added, if the frame number is 
0 or empty. This is a problem for PDF files, causing GraphicsMagick to 
hang and creating an image for each page of the PDF.

Solution:
Make it right by adding the frame parameter by checking if it is "numeric".

All the best,
Benni.
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