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Old 09-10-2011, 11:22 AM   #1
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PDF to PDF corruption

After Calibre added a particular PDF to the library (no conversion asked, just adding) the added PDF can't be opened in Acrobat Reader which complains the file is corrupt.

Acrobat Reader can open the original source PDF with no problem.

I conclude that Calibre does not simply copy the source PDF to its library (along with creating additional metadata) but rather does some kind of conversion (PDF to PDF).

This has happened to just a few of my PDFs. I can't figure out any special oddness in this specific PDF, other than it is rather large (45MB).

I am respectfully wondering... shouldn't Calibre just copy exactly from the source when adding to the library?
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Old 09-10-2011, 11:29 AM   #2
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It does just copy files. Compare file sizes of the two files, or run a md5 hash on them to verify this.
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Old 09-10-2011, 11:48 AM   #3
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The file sizes are different.

Source PDF = 44.8 Mb (46,980,499 bytes)
Added PDF = 45.0 Mb (47,259,648 bytes)
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Old 09-10-2011, 12:01 PM   #4
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By any chance do you have any of the DRM removal plugins installed? If so, that might be the problem.
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Old 09-10-2011, 12:07 PM   #5
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Of course, I should have thought about that. Let me try without these plugin. I'm quite sure this will correct the problem.
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Old 09-10-2011, 12:12 PM   #6
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Yep, problem was caused by the plugin and Calibre is clean. Sorry for bothering you Kovid. You can erase my PM too.
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