Kindlegen output from epub DOUBLES in size?

twowheels · 12-28-2010, 02:50 AM

I just converted a few books using kindlegen and noticed:

112.8 KB --> 266.5 KB
407.3 KB --> 1.1 MB
544.6 KB --> 1.2 KB
632.2 KB --> 1.7 MB
281.5 KB --> 647.2 KB
249.4 KB --> 606.7 KB
87.9 KB --> 192.8 KB

Whoa... is this a shortcoming of the MOBI format or the kindlegen app?

ATDrake · 12-28-2010, 03:06 AM

It's KindleGen. At some point the developers decided to tweak it so that the resulting Mobi contained a copy of the original source files (probably useful for debugging stuff that came from elsewhere) and then removed the -donotaddsource option which prevented this.

You can use pdurrant's kindlestrip python script to trim the bloat.

wallcraft · 12-28-2010, 03:07 AM

Did you include -c1 for standard compression? If not, perhaps -c0 (no compression) is the default.

EDIT: ATDrake's post sounds right to me.

twowheels · 12-28-2010, 12:04 PM

Wow, what a strange default. I don't need the space, and treat the mobi files as intermediate files, so I'll ignore it for now, but good to know. Thanks!

12-28-2010, 02:50 AM	#1
twowheels Wizard Posts: 1,785 Karma: 13412766 Join Date: Nov 2010 Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro	Kindlegen output from epub DOUBLES in size? I just converted a few books using kindlegen and noticed: 112.8 KB --> 266.5 KB 407.3 KB --> 1.1 MB 544.6 KB --> 1.2 KB 632.2 KB --> 1.7 MB 281.5 KB --> 647.2 KB 249.4 KB --> 606.7 KB 87.9 KB --> 192.8 KB Whoa... is this a shortcoming of the MOBI format or the kindlegen app?

12-28-2010, 03:07 AM	#3
wallcraft reader Posts: 6,975 Karma: 5183568 Join Date: Mar 2006 Location: Mississippi, USA Device: Kindle 3, Kobo Glo HD	Did you include -c1 for standard compression? If not, perhaps -c0 (no compression) is the default. EDIT: ATDrake's post sounds right to me. Last edited by wallcraft; 12-28-2010 at 03:09 AM.

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12-28-2010, 03:06 AM	#2
ATDrake Wizzard Posts: 11,517 Karma: 33048258 Join Date: Mar 2010 Location: Roundworld Device: Kindle 2 International, Sony PRS-T1, BlackBerry PlayBook, Acer Iconia	It's KindleGen. At some point the developers decided to tweak it so that the resulting Mobi contained a copy of the original source files (probably useful for debugging stuff that came from elsewhere) and then removed the -donotaddsource option which prevented this. You can use pdurrant's kindlestrip python script to trim the bloat.

12-28-2010, 12:04 PM	#4
twowheels Wizard Posts: 1,785 Karma: 13412766 Join Date: Nov 2010 Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro	Wow, what a strange default. I don't need the space, and treat the mobi files as intermediate files, so I'll ignore it for now, but good to know. Thanks!

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