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Thumbnails for specific PDF file on Commons not generated: "no decode delegate for this image format"
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Description

I have some issues with this file:
https://commons.wikimedia.org/wiki/File:Welcome_2WP_Serbian_04-16-2012.pdf

I can't see its first page, not even as a thumbnail in the File history section, although you can see it's there if you download the original file.

If I click on the various sizes links, I get the following error messages:

Error generating thumbnail - There have been too many recent failed attempts (4 or more) to render this thumbnail. Please try again later.

or

Our servers are currently experiencing a technical problem. This is probably temporary and should be fixed soon. Please try again in a few minutes.

Version: wmf-deployment
Severity: normal
Exempels: https://commons.wikimedia.org/wiki/Category:PDF_files_with_errors
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=71327

Details

Reference
bz70734

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Event Timeline

• bzimport raised the priority of this task from to Medium.Nov 22 2014, 3:53 AM
• bzimport added a project: Wikimedia-Media-storage.
• bzimport set Reference to bz70734.
• bzimport added a subscriber: Unknown Object (MLST).
• Elitre created this task.Sep 11 2014, 6:51 PM
Aklapper added a comment.Sep 11 2014, 7:19 PM

Confirming.

Tgr added a comment.Sep 11 2014, 10:01 PM

The error message is

2014-09-11 21:57:33 mw1156 commonswiki: thumbnail failed on mw1156: error 1 "**** Warning: considering '0000000000 XXXXX n' as a free entry.

  • Warning: considering '0000000000 XXXXX n' as a free entry.

(...line repeats 122 times...)

  • Warning: considering '0000000000 XXXXX n' as a free entry.

convert: no decode delegate for this image format `/tmp/magick-pF48VPYV' @ error/constitute.c/ReadImage/532.
convert: missing an image filename `/tmp/transform_4ffaf3e633a6-1.jpg' @ error/convert.c/ConvertImageCommand/3011." from "('gs' '-sDEVICE=jpeg' '-sOutputFile=-' '-dFirstPage=1' '-dLastPage=1' '-r150' '-dBATCH' '-dNOPAUSE' '-q' '/tmp/localcopy_3d29485c72ff-1.pdf' | 'convert' '-depth' '8' '-quality' '95' '-resize' '422' '-' '/tmp/transform_4ffaf3e633a6-1.jpg')"

Bawolff added a comment.Sep 13 2014, 4:42 PM

Both evince and xpdf take a long time to display the first page of the pdf file (Although they eventually do display it). Maybe something funky with this particular file?

• Elitre added a comment.Sep 13 2014, 7:37 PM

I tried to upload it again to test but nothing changes. :/

• Elitre added a comment.Sep 17 2014, 10:17 PM

As an update, I tried to overwrite the image by getting a new cover to the pdf. While it now opens correctly in preview on my Mac, it still doesn't generate the thumbnails (I also uploaded it at https://commons.wikimedia.org/w/index.php?title=File:Welcome_2WP_Serbian_04-16-2012_.pdf&page=1 , and this one actually gave me some "too many pixels" error message).
Can you recommend the best way to proceed? Thanks.

• Gilles added a project: Multimedia.Nov 26 2014, 4:28 PM
Aklapper subscribed.Dec 29 2014, 11:48 AM
In T72734#764455, @Tgr wrote:

convert: no decode delegate for this image format

More testcases: Same problem for
https://commons.wikimedia.org/wiki/File:WorldAviation.198409.BackCover.pdf
https://commons.wikimedia.org/wiki/File:WorldAviation.MiddleTwoPages.ICAORegions.pdf
brought up in https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=144583567#No_thumbnails_from_pdf_files.3F_Like_File:WorldAviation.198409.BackCover.pdf

Aklapper renamed this task from Thumbnails for a specific PDF file on Commons not generated to Thumbnails for specific PDF file on Commons not generated: "no decode delegate for this image format".Dec 29 2014, 11:48 AM
Aklapper set Security to None.
Bawolff added a comment.Jan 2 2015, 12:28 AM
In T72734#946929, @Aklapper wrote:
In T72734#764455, @Tgr wrote:

convert: no decode delegate for this image format

More testcases: Same problem for
https://commons.wikimedia.org/wiki/File:WorldAviation.198409.BackCover.pdf
https://commons.wikimedia.org/wiki/File:WorldAviation.MiddleTwoPages.ICAORegions.pdf
brought up in https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=144583567#No_thumbnails_from_pdf_files.3F_Like_File:WorldAviation.198409.BackCover.pdf

I looked into that file. File took insanely long (about 10 minutes) for ghostscript to render. My guess is ghostscript took more than the $wgMaxShellTime limit, thus gs died and sent convert something that was not a file. image magick gave that error. I don't know if there's anything we can realistically do in such a situation. We probably do not want limits being what would be required in order to render this file (Assuming I'm right in that is what is causing this).

6thCommonSense subscribed.Jan 13 2015, 7:55 PM
In T72734#952161, @Bawolff wrote:
In T72734#946929, @Aklapper wrote:
In T72734#764455, @Tgr wrote:

convert: no decode delegate for this image format

More testcases: Same problem for
https://commons.wikimedia.org/wiki/File:WorldAviation.198409.BackCover.pdf
https://commons.wikimedia.org/wiki/File:WorldAviation.MiddleTwoPages.ICAORegions.pdf
brought up in https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=144583567#No_thumbnails_from_pdf_files.3F_Like_File:WorldAviation.198409.BackCover.pdf

I looked into that file. File took insanely long (about 10 minutes) for ghostscript to render. My guess is ghostscript took more than the $wgMaxShellTime limit, thus gs died and sent convert something that was not a file. image magick gave that error. I don't know if there's anything we can realistically do in such a situation. We probably do not want limits being what would be required in order to render this file (Assuming I'm right in that is what is causing this).

I can reupload them after optimization. I do not know how to do that though...

Jdforrester-WMF moved this task from Untriaged to Backlog on the Multimedia board.Sep 4 2015, 6:31 PM
Restricted Application added a subscriber: Matanya. · View Herald TranscriptSep 4 2015, 6:31 PM
Jdforrester-WMF removed a project: Multimedia.Sep 21 2015, 4:01 PM
matmarex edited projects, added MediaWiki-File-management; removed Wikimedia-Media-storage.Jan 26 2016, 4:18 PM
Restricted Application added projects: Multimedia, Commons. · View Herald TranscriptJan 26 2016, 4:18 PM
Steinsplitter moved this task from Incoming to Backlog on the Commons board.Feb 13 2016, 5:35 PM
Josve05a mentioned this in T127914: PDF-preview is missing (Error creating thumbnail: can't process font stream).Feb 24 2016, 1:05 AM
MarkTraceur unsubscribed.Jan 27 2017, 10:11 PM
Aklapper mentioned this in T164045: PDF thumbnails fail to render on newly-uploaded PDF files.Apr 28 2017, 12:14 PM
Perhelion mentioned this in T167420: Thumbnails for specific PDF file rendered half of their proper width on File: page (thumbnail file itself is correct).Jun 8 2017, 2:03 PM
Perhelion updated the task description. (Show Details)Jun 8 2017, 2:10 PM
Aklapper closed this task as Resolved.Nov 16 2017, 12:37 AM

All three test cases provided in this task work nowadays (maybe because of switching the backend to Thumbor), hence closing task as resolved.

• Elitre mentioned this in T213771: First page of a specific PDF files on Commons does not render a preview.Feb 8 2019, 12:57 PM
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