Conversion problem with work-around

C Alberga · 08-19-2016, 10:47 AM

Running on Windows 7 Pro, up to date, with Calibre 2.64 [64bit].

This involves a commercial book, but I can find no copyright statement, and the publisher is well known for packaging out-of-copyright works.

When attempting to convert the attached .epub file to an .AZW3 file the attached error is signaled. Conversion to .mobi works, but that too cannot be converted to .AZW3. However, either of the .epub or the .mobi files can be converted to either .ZIP or .HTMLZ files, which will then successfully convert to .AZW3.

On a somewhat casual look (the damn book IS over-long!) there does not seem to be any loss of formatting or text.

Given the work-around this isn't crucial, but it would seem to indicate a (probably subtle) bug somewhere in the conversion chain.

kovidgoyal · 08-19-2016, 01:26 PM

Trying to track down the cause of that in such a large book is way too much work, if you ever come across a more reasonable sized example that triggers the bug let me know, in the meantime just use workaround for this book.

kovidgoyal · 08-19-2016, 01:35 PM

Actually, it was easy to track down, it is caused by the book having a huge (> 255) number of entries in its ToC that all point to the same place. Delete the ncx file since it is useless and then convert and you should be fine.

C Alberga · 08-20-2016, 06:25 PM

Thank you. I have a few others that show the same behavior, and all very large. I'll check that out.

08-19-2016, 10:47 AM	#1
C Alberga Enthusiast Posts: 45 Karma: 10 Join Date: Jul 2012 Device: none	Conversion problem with work-around Running on Windows 7 Pro, up to date, with Calibre 2.64 [64bit]. This involves a commercial book, but I can find no copyright statement, and the publisher is well known for packaging out-of-copyright works. When attempting to convert the attached .epub file to an .AZW3 file the attached error is signaled. Conversion to .mobi works, but that too cannot be converted to .AZW3. However, either of the .epub or the .mobi files can be converted to either .ZIP or .HTMLZ files, which will then successfully convert to .AZW3. On a somewhat casual look (the damn book IS over-long!) there does not seem to be any loss of formatting or text. Given the work-around this isn't crucial, but it would seem to indicate a (probably subtle) bug somewhere in the conversion chain. Last edited by Dr. Drib; 08-19-2016 at 03:33 PM.

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08-19-2016, 01:26 PM	#2
kovidgoyal creator of calibre Posts: 45,251 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Trying to track down the cause of that in such a large book is way too much work, if you ever come across a more reasonable sized example that triggers the bug let me know, in the meantime just use workaround for this book.

08-19-2016, 01:35 PM	#3
kovidgoyal creator of calibre Posts: 45,251 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Actually, it was easy to track down, it is caused by the book having a huge (> 255) number of entries in its ToC that all point to the same place. Delete the ncx file since it is useless and then convert and you should be fine.

08-20-2016, 06:25 PM	#4
C Alberga Enthusiast Posts: 45 Karma: 10 Join Date: Jul 2012 Device: none	Thank you. I have a few others that show the same behavior, and all very large. I'll check that out.

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