Gen3 Gen3 does not open some epub files

lordofazeroth · 07-22-2014, 08:07 AM

I got a problem with some of my epubs on my Gen3 device.
Some epubs are simply not opening. The cover picture is shown but when opening the book the Gen3 reboots.

The same book on my Kobo mini works fine.
EPub is 3.2 Mb in size and about 200 pages.

Any idea why it is not loading?
converting from epub to epub in calibre does not work either.

lordofazeroth · 02-10-2015, 02:40 PM

Still having this problem.
On one epub book I simply select it to open and the device restarts.
How can I find out whats causing the trouble?

EowynCarter · 02-10-2015, 03:13 PM

You can try sigil for that. (ePub check).

lordofazeroth · 02-10-2015, 03:33 PM

Is that a calibre plugin or a standalone software?

AnemicOak · 02-10-2015, 03:48 PM

Quote:

Originally Posted by lordofazeroth

Is that a calibre plugin or a standalone software?

Sigil is a separate program...
http://sigil-ebook.com/

hubertphava · 02-11-2015, 05:14 PM

3,2 M for 200 pages isn't normal...
I think you must "validate" your epub or installing sigil as suggested or using standalone tools like this:

http://validator.idpf.org/

thas is the "official" validator of idpf ( but has some issues ) and this:

https://code.google.com/p/epubcheck/

I prefer to use epubchecker that is the program embedded in sigil...

As you have validate your epub, you'll be able to see the cause of.

HP

Flinx · 02-21-2015, 07:45 AM

When my Gen3 crashed on some epub ebooks, the cause were always some too large pictures. Try to look with Sigil and if the book contains pictures larger than 1024x800, try to scale them to 800x600 (for example with a graphics software like IrfanView). But the problem were not the dimensions, but the file size of the pictures. Maybe someone knows the critical size, I do not remember.

hermano · 02-23-2015, 05:22 PM

Quote:

Originally Posted by Flinx

When my Gen3 crashed on some epup ebooks, the cause were always some too large pictures. Try to look with Sigil and if the book contains pictures larger than 1024x800, try to scale them to 800x600 (for example with a graphics software like IrfanView). But the problem were not the dimensions, but the file size of the pictures. Maybe someone knows the critical size, I do not remember.

Weirdly, I am still using mobi on my Gen 3..and never had an issue..

JSWolf · 02-23-2015, 05:41 PM

Quote:

Originally Posted by lordofazeroth

Is that a calibre plugin or a standalone software?

You could use the eBook Editor built into Calibre and from there validate the eBooks to see what's wrong with it.

JSWolf · 02-23-2015, 05:43 PM

Quote:

Originally Posted by hubertphava

3,2 M for 200 pages isn't normal...
I think you must "validate" your epub or installing sigil as suggested or using standalone tools like this:

Actually, it's not unusual. Large images and/or embedded fonts can make an ePub be that large. It's not unusual at all,

Flinx · 02-27-2015, 07:21 AM

Quote:

Originally Posted by hermano

Weirdly, I am still using mobi on my Gen 3..and never had an issue..

It were not much books, two or three of many I did read with the Gen 3, but it may be worth the check. And I did have this type of crash only with epub, not with mobi.

Jayholm · 11-18-2016, 08:42 AM

I had the same problem with my Cybook Opus. When trying to open some epub files, Opus restarted back to library. In my case problem was "too big" cover images as Flinx suggested. Some publishers uses pictures with resolution for example 1400x2112 and that seems to be too big for Opus to handle. Cybook Frontlight opens those books without problem.

I replaced cover photo in Calibre (right click - edit metadata) and converted book in Calibre (epub to epub). When I sent new file to Opus I was able to read book without problems.

JSWolf · 11-24-2016, 07:13 PM

The problem is older devices cannot handle (or handles poorly) high resolution graphics. Newer high resolution Readers need these and thus, some eBooks have them and the older devices are just not going to cut it.

GeoffC · 12-31-2016, 03:32 AM

Quote:

Originally Posted by hermano

Weirdly, I am still using mobi on my Gen 3..and never had an issue..

ditto

07-22-2014, 08:07 AM	#1
lordofazeroth Connoisseur Posts: 70 Karma: 10 Join Date: Dec 2008 Device: kobo mini and kindle touch	Gen3 does not open some epub files I got a problem with some of my epubs on my Gen3 device. Some epubs are simply not opening. The cover picture is shown but when opening the book the Gen3 reboots. The same book on my Kobo mini works fine. EPub is 3.2 Mb in size and about 200 pages. Any idea why it is not loading? converting from epub to epub in calibre does not work either.

02-21-2015, 07:45 AM	#7
Flinx Connoisseur Posts: 63 Karma: 12132 Join Date: Sep 2006 Location: Germany Device: Cybook Muse Frontlight, Cybook Odyssey	When my Gen3 crashed on some epub ebooks, the cause were always some too large pictures. Try to look with Sigil and if the book contains pictures larger than 1024x800, try to scale them to 800x600 (for example with a graphics software like IrfanView). But the problem were not the dimensions, but the file size of the pictures. Maybe someone knows the critical size, I do not remember. Last edited by Flinx; 02-27-2015 at 07:18 AM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Unable to open my epub files (7.4) under fedora.	Andjety	Sigil	14	01-05-2014 06:54 PM
mac osx open assign ebook viewer to epub files mac osx	asllearner	Devices	4	09-13-2013 04:17 AM
overdrive open epub / open pdf?	Joykins	General Discussions	4	01-31-2013 05:05 PM
Problem with MOBI files on Cybook Gen3- unexpected reboots	Murphy	Conversion	6	05-09-2011 11:05 AM
Gen3 does play mp3 files	kurstjens	Bookeen	10	05-31-2009 04:59 PM

02-10-2015, 02:40 PM	#2
lordofazeroth Connoisseur Posts: 70 Karma: 10 Join Date: Dec 2008 Device: kobo mini and kindle touch	Still having this problem. On one epub book I simply select it to open and the device restarts. How can I find out whats causing the trouble?

02-10-2015, 03:13 PM	#3
EowynCarter Wizard Posts: 4,338 Karma: 4000000 Join Date: Oct 2008 Location: Paris Device: Cybooks; Sony PRS-T1	You can try sigil for that. (ePub check).

02-10-2015, 03:33 PM	#4
lordofazeroth Connoisseur Posts: 70 Karma: 10 Join Date: Dec 2008 Device: kobo mini and kindle touch	Is that a calibre plugin or a standalone software?

02-11-2015, 05:14 PM	#6
hubertphava Connoisseur Posts: 69 Karma: 1134558 Join Date: Dec 2012 Location: Italy Device: Cybook Opus, Onyx-Boox Poke5	3,2 M for 200 pages isn't normal... I think you must "validate" your epub or installing sigil as suggested or using standalone tools like this: http://validator.idpf.org/ thas is the "official" validator of idpf ( but has some issues ) and this: https://code.google.com/p/epubcheck/ I prefer to use epubchecker that is the program embedded in sigil... As you have validate your epub, you'll be able to see the cause of. HP

11-18-2016, 08:42 AM	#12
Jayholm Junior Member Posts: 1 Karma: 10 Join Date: Nov 2016 Device: Cybook Opus; Cybook Frontlight HD	I had the same problem with my Cybook Opus. When trying to open some epub files, Opus restarted back to library. In my case problem was "too big" cover images as Flinx suggested. Some publishers uses pictures with resolution for example 1400x2112 and that seems to be too big for Opus to handle. Cybook Frontlight opens those books without problem. I replaced cover photo in Calibre (right click - edit metadata) and converted book in Calibre (epub to epub). When I sent new file to Opus I was able to read book without problems.

11-24-2016, 07:13 PM	#13
JSWolf Resident Curmudgeon Posts: 80,727 Karma: 150249619 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	The problem is older devices cannot handle (or handles poorly) high resolution graphics. Newer high resolution Readers need these and thus, some eBooks have them and the older devices are just not going to cut it.