https://bugzilla.wikimedia.org/show_bug.cgi?id=41380
Web browser: ---
Bug #: 41380
Summary: Corrupt images should be detected and reported - by
humans or automatic script.
Product: Wikimedia
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Media storage
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected],
[email protected]
Blocks: 41371
Classification: Unclassified
Mobile Platform: ---
We've reports on Wikimedia Commons thumbnails can't be generated because images
are corrupt.
* * *
[ Analysis ]
Well, the problem is these images seems to really be corrupted.
e.g. [[Commons:File:Augustinusbishop.gif]]
/home/dereckson ] fetch
https://upload.wikimedia.org/wikipedia/commons/7/7b/Augustinusbishop.gif
Augustinusbishop.gif 100% of 346 kB 889 kBps
/home/dereckson ] mogrify Augustinusbishop.gif -resize 200x300
mogrify: corrupt image `Augustinusbishop.gif' @ error/gif.c/ReadGIFImage/1348.
* * *
[ A heavy to maintain solution ]
We should have a script verifying periodically our pictures and reporting
corrupted images detected.
PIL can detect such images with the verify method.
Here a sample script (works for any other format supported by PIL too):
https://bitbucket.org/denilsonsa/small_scripts/src/tip/jpeg_corrupt.py
The infrastructure we need should be optimized to detect at least 100 000
pictures per day (= 1.15 image per seconds), so if it runs continuously we can
have every picture verified every 150 days.
* * *
It should be evaluated if this is needed or if human reporting would work
better.
We also have to involve Wikimedia Commons community to manually fix the
corrupted pictures.
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