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Old 10-29-2011, 03:13 AM   #1
Joy736
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epub to epub converting: making chapters?

Hello,

I have some poorly formatted epubs. Those are just 1 run of text, without chapters.
Is there a way for Calibre to recognize the chapters, using epub to epub conversion, and make every chapter begin on a new page?

Please note that I haven't used calibre much and know very very little about it.

Thank you.

Last edited by Joy736; 10-29-2011 at 10:01 AM.
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Old 10-29-2011, 05:52 AM   #2
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Convert from ePub to HTMLZ and then convert back HTMLZ to ePub with Heuristics enabled.
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Old 10-29-2011, 06:01 AM   #3
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Quote:
Originally Posted by ldolse View Post
Convert from ePub to HTMLZ and then convert back HTMLZ to ePub with Heuristics enabled.
I just opened Calibre and found what you meant. It's much more easier than I tought
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Old 10-29-2011, 07:43 AM   #4
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The HTML step is not necessary - Calibre can convert from epub to epub. A copy of the original epub will then be stored as EPUB_ORIG format.

Calibre will then make the chapters for you - if the chapter recognition pattern matches, otherwise you have to adapt the pattern yourself, or use the epub tweaking feature (explode, edit manually, implode/convert from there...).
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Old 10-29-2011, 09:17 AM   #5
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@frostschutz, HTMLZ with default settings will clean up a lot of poorly formatted HTML. This coupled with Heuristics will find most chapters without needing to write pattern matches.
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Old 10-30-2011, 02:54 AM   #6
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Quote:
Originally Posted by user_none View Post
@frostschutz, HTMLZ with default settings will clean up a lot of poorly formatted HTML. This coupled with Heuristics will find most chapters without needing to write pattern matches.
The other problem with many poorly formatted ePubs is they were originally converted from Lit/text/whatever using a version of Calibre without heuristics (or heuristics was disabled), so there would be seemingly random split points every 260K - HTMLZ will merge the random split points back together, and without doing that first heuristics wouldn't be able to find the chapters correctly.
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Old 10-30-2011, 07:42 AM   #7
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I didn't know calibre conversion behaved differently depending on input format used. Most converters I'm familiar with go to common ground first and go on from there so the input format does not matter (so instead of any->any it's really any->specific->any). Thanks for the info, I'll experiment with HTMLZ in the future when conversion doesn't go as expected.
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Old 10-30-2011, 10:53 AM   #8
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ePub 'is' the common ground with Calibre - and under many scenarios your advice of skipping htmlz and going ePub->ePub is perfectly legit. It's only because the OP specifically mentioned crappy ePubs and trouble with chapters that HTMLZ is a better route in this case.
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Old 10-30-2011, 04:47 PM   #9
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Even though the conversion process is always the same Input -> OEB -> output, different input will produce different output. Converting to HTMLZ (or any other format) then converting that instead of the EPUB will introduce differences in the final output.

Think about this converting a VHS to an MP4 file vs a DVD to an MP4. No matter what you are going to get similar output (the save video content) but there will be a difference in how the final output from each input looks due to differences in what the inputs support and how they are structured. Even if you were to take an MP3 and a WMA and convert to AAC you will still have a very different output file even though they sound alike.
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