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Old 08-09-2008, 10:03 AM   #1
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Problems converting epub books
Hello,
I just tried converting a number of sample books off Adobe's website (via Digital Editions) and it was a bit of a hit and miss affair:
'Thirteen Moons' and an extract of 'Hot' converted OK.
'The Father Thing' and 'Death and the Senator' failed.

Error logs follow:
Quote:
('ConversionError', u'.epub extraction failed'):
Failed to perform job: Convert book: The Father Thing
Detailed traceback:
Traceback (most recent call last):
File "", line 760, in worker
File "", line 729, in work
File "library.pyz/calibre.ebooks.lrf.any.convert_from", line 167, in main
File "library.pyz/calibre.ebooks.lrf.any.convert_from", line 137, in process_file
File "library.pyz/calibre.ebooks.lrf.epub.convert_from", line 42, in process_file
File "library.pyz/calibre.ebooks.lrf.epub.convert_from", line 33, in generate_html
ConversionError: .epub extraction failed
Log:
''
Quote:
('ConversionError', u'.epub extraction failed'):
Failed to perform job: Convert book: Death and the Senator
Detailed traceback:
Traceback (most recent call last):
File "", line 760, in worker
File "", line 729, in work
File "library.pyz/calibre.ebooks.lrf.any.convert_from", line 167, in main
File "library.pyz/calibre.ebooks.lrf.any.convert_from", line 137, in process_file
File "library.pyz/calibre.ebooks.lrf.epub.convert_from", line 42, in process_file
File "library.pyz/calibre.ebooks.lrf.epub.convert_from", line 33, in generate_html
ConversionError: .epub extraction failed
Log:
''
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Old 08-09-2008, 01:58 PM   #2
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what version of calibre are you using?
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Old 08-09-2008, 07:59 PM   #3
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Quote:
Originally Posted by kovidgoyal View Post
what version of calibre are you using?
Calibre 0.4.83 on Ubuntu Hardy Heron AMD64
Last edited by AprilHare; 08-09-2008 at 08:03 PM.
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Old 08-09-2008, 09:33 PM   #4
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An update:
Tried more Adobe sampler eBooks:
God Is A Salesman: Learn From The Master (Extract), Sway (Extract), The Geography of Bliss: One Grump's Search for the Happiest Places in the World (Extract) and Trail of Crumbs: Hunger, Love, and the Search for Home (Extract) converted OK.
Alice in Wonderland and The Adventures of Sherlock Holmes refuse to add to the calibre database:

Error given:
Quote:
ERROR: Unhandled exception
not an .epub OCF container
Detailed traceback:
Traceback (most recent call last):
File "", line 448, in add_books
File "", line 460, in _add_books
File "library.pyz/calibre.ebooks.metadata.meta", line 72, in get_metadata
File "library.pyz/calibre.ebooks.metadata.epub", line 109, in get_metadata
File "library.pyz/calibre.ebooks.metadata.epub", line 80, in __init__
File "library.pyz/calibre.ebooks.metadata.epub", line 59, in __init__
EPubException: not an .epub OCF container
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Old 08-09-2008, 09:56 PM   #5
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Quote:
Originally Posted by AprilHare View Post
Alice in Wonderland and The Adventures of Sherlock Holmes refuse to add to the calibre database:
I'm having trouble finding links to these books, but did find another thread on mobileread noting that they fail Adobe's own epubcheck EPUB-compliance-checking tool. It's quite possible these books are malformed, but if DE reads them calibre should probably just give a warning and keep on going... Could you post or PM me a link to these books? Thanks.
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Old 08-09-2008, 09:59 PM   #6
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Quote:
Originally Posted by llasram View Post
I'm having trouble finding links to these books, but did find another thread on mobileread noting that they fail Adobe's own epubcheck EPUB-compliance-checking tool. It's quite possible these books are malformed, but if DE reads them calibre should probably just give a warning and keep on going... Could you post or PM me a link to these books? Thanks.
Find them here.
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Old 08-10-2008, 12:08 AM   #7
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Quote:
Originally Posted by llasram View Post
I'm having trouble finding links to these books, but did find another thread on mobileread noting that they fail Adobe's own epubcheck EPUB-compliance-checking tool. It's quite possible these books are malformed, but if DE reads them calibre should probably just give a warning and keep on going... Could you post or PM me a link to these books? Thanks.
See DMcCunney response for URL to the ebooks.
Article link?
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Old 08-10-2008, 09:03 PM   #8
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Quote:
Originally Posted by AprilHare View Post
See DMcCunney response for URL to the ebooks.
They sure made downloading the books a pain -- you need to have ADE installed, which meant booting a Windows VM yada yada.

In any case, I took a look at the Alice in Wonderland book and it's completely missing the 'mimetype' file indicating that the containing ZIP archive is in fact an EPUB ebook. If those two ADE sample books are the only "EPUB" books with with this problem, then I don't think calibre -- or other EPUB tools -- should treat them as EPUB books. You can mostly-fix them yourself by adding a file named "mimetype" containing just the string "application/epub+zip" (no newline at the end) to the ZIP archives.

Quote:
Originally Posted by AprilHare View Post
Article link?
https://www.mobileread.com/forums/sho...501#post129662
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Old 08-11-2008, 10:25 AM   #9
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Well ADE is set up for DRM so yeah they don't make things too easy
I wonder how many of the first EPUB books will be malformed in this way and how they can be detected (except for the .epub filename)?

Quote:
Originally Posted by llasram View Post
They sure made downloading the books a pain -- you need to have ADE installed, which meant booting a Windows VM yada yada.

In any case, I took a look at the Alice in Wonderland book and it's completely missing the 'mimetype' file indicating that the containing ZIP archive is in fact an EPUB ebook. If those two ADE sample books are the only "EPUB" books with with this problem, then I don't think calibre -- or other EPUB tools -- should treat them as EPUB books. You can mostly-fix them yourself by adding a file named "mimetype" containing just the string "application/epub+zip" (no newline at the end) to the ZIP archives.



https://www.mobileread.com/forums/sho...501#post129662
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Old 08-11-2008, 12:08 PM   #10
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Quote:
Originally Posted by llasram View Post
They sure made downloading the books a pain -- you need to have ADE installed, which meant booting a Windows VM yada yada.

In any case, I took a look at the Alice in Wonderland book and it's completely missing the 'mimetype' file indicating that the containing ZIP archive is in fact an EPUB ebook. If those two ADE sample books are the only "EPUB" books with with this problem, then I don't think calibre -- or other EPUB tools -- should treat them as EPUB books. You can mostly-fix them yourself by adding a file named "mimetype" containing just the string "application/epub+zip" (no newline at the end) to the ZIP archives.



https://www.mobileread.com/forums/sho...501#post129662
One other detail if you add the mimetype file. That file needs to go into the root directory of the zipfile, and it cannot be compressed.

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Old 08-11-2008, 01:00 PM   #11
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Quote:
Originally Posted by jpenglish View Post
One other detail if you add the mimetype file. That file needs to go into the root directory of the zipfile, and it cannot be compressed.
And to actually be OCF-compliant it needs to be the very first file in the archive and not have any extended attributes attached. That's why I said mostly-fixed . As long as it's in the root directory and contains the right MIME type, calibre's EPUB-parsing code will handle it. Not a guarantee of future behavior, but enough to get those files working now.
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Old 08-11-2008, 07:31 PM   #12
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Quote:
Originally Posted by llasram View Post
You can mostly-fix them yourself by adding a file named "mimetype" containing just the string "application/epub+zip" (no newline at the end) to the ZIP archives.
The python script oeb2epub appears to do exactly that if its input directory contains an exploded ePub.
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Old 08-11-2008, 08:15 PM   #13
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I've tried epub2lrf several times with books from Feedbooks and it always worked quite well.
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