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Opened 3 years ago

Last modified 13 months ago

#52509 new defect (bug)

Error generating Thumbnails of PDF-Files

Reported by: falk07's profile falk07 Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version: 5.6.1
Component: Media Keywords: needs-patch
Focuses: Cc:


This is a follow-up to #48853.

This issue seems to be still present in Version 5.6.1
Some PDF-Files cause an internal server error, some do not. (The server's error log tells something about missing headers)

Here's what i did to isolate the error:

  • I examined the PDF-Files. The affected files had a PDF-Version 1.7 an were created with non-Adobe-Tools (e.g. Office365). PDFs with Version 1.4 and 1.5 (created with Acrobat) worked well.
  • tried it with a local copy of the site on XAMPP: No Problems
  • used a little code-snippet to prevent thumbnail-generation in general: Upload works

This is the snippet:

function disable_pdf_previews() {
    $fallbacksizes = array();
    return $fallbacksizes;
add_filter('fallback_intermediate_image_sizes', 'disable_pdf_previews');

Change History (2)

This ticket was mentioned in Slack in #core-media by antpb. View the logs.

2 years ago

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