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Old 07-10-2018, 11:22 PM   #481
KindleAZWorKFX
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The MOBI files produced by Kindle Previewer do not include KFX format. KFX is always separate.
kindlegen mobi format version is v5 or v6
and Kindle Previewer 3 mobi format final version is v8
kindleunpack plugin mobi & azw3 version is v5 or v6 I think.

info from the pdf on kindle previewer 3, no where does it not say that the mobi exported file does not include the kfx formatting in it, yes it does not do the extention of kfx in the export also says something about an azk format too, got newest version of Kindle previewer 3 3.24.0 version
it only downgrades the mobi exported version when you use kindleunpack on it that does downgrade from version 8 (kindle previewer 3 mobi file) to version 6(either kindlegen or kindleunpack file) info on mobi and/or azw3 versions in their split ebook files, otherwise the mobi format reads as a newer format, even without the kfx extention filename.kfx at the end of it, look up this info below in its pdf file. if I understand it right it talks about including Enhanced Typesetting in the exported files from Kindle Previewer 3 app with its export if I read that right?

Last edited by KindleAZWorKFX; 07-12-2018 at 05:55 AM. Reason: edited today to shorten it etc
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Old 07-12-2018, 08:51 AM   #482
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it talks about including Enhanced Typesetting in the exported files from Kindle Previewer 3 app with its export if I read that right?
KFX is short for Kindle Format 10 and is different from the previous Kindle Format 8 (KF8 aka AZW3). MOBI files exported by the Previewer contain KF8, among other things, but not KFX.

When you export a book from Kindle Previewer in MOBI format the pop up message states, "Enhanced Typesetting is enabled for the book being previewed, but it is not supported in the exported file." Enhanced Typesetting is a feature of the KFX format.

The variant of KFX format produced by the Kindle Previewer is left in your temp directory after conversion. The Previewer provides no means to export it.
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Old 07-13-2018, 02:22 AM   #483
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is it possible to use Kindle huffdic compression with the KFX plugin ( Kindle Format 10)?

from kindlegen command app, dos based program from amazon.com etc

-c2: Kindle huffdic compression

one last question I should of asked is does kindle Paperwrite 2 device even support KFX formats (Kindle Format 10 ) with Kindle huffdic compression in the files, or would that also hard crash our kindle Paperwrite 2 devices, not sure if it would be an problem for the defaults like an non-standard compression or if that's what amazon is using too with the format, its an good question I think anyway to ask about.

I like the Kindle huffdic compression from kindlegen of the epub files into mobi since it seems to compressed them more than what calibre can do on default converting of them.


I like the idea of the converting azw3 and epub into KFX format, but it seems like it could be more compressed the KFK format more than it does maybe, that's a question I had also, can the converting with the KFK plugin for calibre do more compression of the files, like the command kindlegen -c2 does for normal epub to mobi conversion, because it can make the default split mobi and azw3 files a lot smaller than the normal ones that calibre can make, it seems like calibre does not use Kindle huffdic compression on its normal converting of files,

anyway that's an question is does Kindle Format 10 (KFX plugin, format) support anything like Kindle huffdic compression with its outputed files, since it seems like its using standard DOC compression or no compression with its KFX plugin, I try and look into this but was wondering if you have an answer about this, if its using an command calling like an kindlegen in its process I look at into that too, too see if it has -c2 command with that or DOC level compression instead.

since I can't tell if the output files are a lot more bigger in size because of DOC compression or if KFX is using an kindle based compression, does it use that or not?

is their an default compression type setting or value that can be edited and changed for it to use Kindle huffdic compression level with the outputted KFX format files like the -c2 command that kindlegen can use from the command prompt, but more of an edit value for the plugin outputs or if you can provide some compression kindle based menu settings in calibre to choose from in future updates of this plugin?

Last edited by KindleAZWorKFX; 07-13-2018 at 02:47 AM. Reason: is it possible to use Kindle huffdic compression with Kindle Format 10 ? and the hardware
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Old 07-13-2018, 08:07 AM   #484
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Originally Posted by KindleAZWorKFX View Post
is it possible to use Kindle huffdic compression with the KFX plugin ( Kindle Format 10)?
The data compression methods that are used in MOBI files to not apply to KFX.

In the books delivered by Amazon in KFX format LZMA data compression is done as part of the DRM scheme used. I don't know of any way to add compression to a KFX book without replicating Amazon's DRM and trying to do that would introduce a whole new set of problems.
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Old 07-14-2018, 02:18 AM   #485
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The data compression methods that are used in MOBI files to not apply to KFX.

In the books delivered by Amazon in KFX format LZMA data compression is done as part of the DRM scheme used. I don't know of any way to add compression to a KFX book without replicating Amazon's DRM and trying to do that would introduce a whole new set of problems.
ok, thanks for that info or answer on this matter.


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Old 07-20-2018, 01:39 PM   #486
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Version 1.21.0 - 20 Jul 2018

Detect Previewer versions up to 3.24. (Newer Previewer versions produce better results.)

Additional fixes applied to the source EPUB before conversion to work around the Previewer not handling URL escape in links. This mostly affects books whose internal file names contain spaces.

Extract additional conversion guidance from Previewer conversion logs.

Truncate the guidance report if it contains an excessive number of entries.


Version 1.21.1 - 20 Jul 2018

Prevent conversion failure when a book contains an unexpected symbol count.

Last edited by jhowell; 07-20-2018 at 10:26 PM.
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