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Old 02-17-2022, 06:06 PM   #376
davidfor
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Originally Posted by PeterT View Post
I wonder if post import the Kobo has to process the books to extract the cover, and that it's that step is preventing the dismount?
The covers are generated as they are needed. Which means that three will be generated for the "My Books" tile after an import. And they might need to be generated for the collection/author tile in the middle on the right. The books at the top should already have the covers unless you replaced a book from calibre or updated the reading status of a book.

The cover generation not being finished would be a likely culprit. I'm not sure whether epubs or kepubs would be worse. For epubs, the RMSDK is used to render the start of the book at then generate the cover from that. For kepubs, the image marked as the cover is extracted and resized.
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Old 02-17-2022, 06:38 PM   #377
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I think it also supports my observation that it only affects new books -- if they are already on the device, it does not need to generate the cover.

For what it matters, I've connected several times today (lots of updated fanfics ) and as long as I made sure to open the ePub there's no issues.
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Old 02-17-2022, 07:15 PM   #378
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Originally Posted by davidfor View Post
The two sideloaded fonts I added to my Clara HD are working. How many sideloaded fonts do you have and how big are the font files? For anyone where the sideloaded fonts are not working, are you using lots of fonts? Or have larger fonts?
I've noticed that the fonts not loading and making the Kobo revert to the default Georgia are the ones with characters other than letters in their names (numbers or dots, for example). Removing these characters with FontForge allow the fonts to display successfully in fonts such as Minion 3 or Aldine 721.

They don't get displayed in the book text, but they do in the fonts list, which shows the font with the font itself. This means that it is a document problem. Something similar happens with the "Font test document" generated with KOReader. If I convert it to kepub, fonts with numbers don't get displayed unless their names are quoted in the css defining the styles that show them. I don't know how to do that on a global device level.

I've tested it on kepubs, not with epubs. Maybe they work also with them.

Can anyone confirm?
Last edited by Barruel; 02-17-2022 at 07:20 PM.
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Old 02-17-2022, 08:58 PM   #379
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Quote:
Originally Posted by davidfor View Post

The cover generation not being finished would be a likely culprit.
If so then simply go to My Books - Recent and watch the covers appear. When they’re finished, then it’s safe.
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Old 02-17-2022, 11:44 PM   #380
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Originally Posted by ownedbycats View Post
So I uploaded a new book to my device.

This time, instead of rebooting, I decided to then read one chapter of my ePub before reconnecting in hopes that it would give Kobo enough time to finish up whatever import processes might still be running.

Whether it was that or connecting with the ePub open, no errors!
I just tried this with kepubs (disconnecting and reading a chapter before putting the reader to sleep) and it was successful! On the next connect, there was no scan prompt. So apparently there is some process that needs time to finish.
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Old 02-18-2022, 12:23 AM   #381
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Quote:
Originally Posted by Calenorn View Post
If so then simply go to My Books - Recent and watch the covers appear. When they’re finished, then it’s safe.
All you should need to do is to wait for the home screen to finish updating. The only covers being generated at that time are for those shown somewhere on the home screen. Going the the book list will actually cause more to be generated that are probably being done for the home screen.

Waiting a minute or so after the home screen has finished updating should give time for the processes to finish and be cleaned up.
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Old 02-18-2022, 05:36 AM   #382
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Originally Posted by davidfor View Post
All you should need to do is to wait for the home screen to finish updating. The only covers being generated at that time are for those shown somewhere on the home screen. Going the the book list will actually cause more to be generated that are probably being done for the home screen.

Waiting a minute or so after the home screen has finished updating should give time for the processes to finish and be cleaned up.
Exactly. But because the book list shows ALL the just side-loaded books, we can be certain that they've all completed the thumbnail generation process.

If someone does this and the device still causes an error, then something else is going on, yes?
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Old 02-18-2022, 06:20 AM   #383
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Quote:
Originally Posted by Calenorn View Post
Exactly. But because the book list shows ALL the just side-loaded books, we can be certain that they've all completed the thumbnail generation process.

If someone does this and the device still causes an error, then something else is going on, yes?
Does going to My Books generate all the covers for the newly added side-loaded ebooks, or only those that are displayed for the ones currently displayed on the screen.

Just curious.
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Old 02-18-2022, 06:22 AM   #384
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Quote:
Originally Posted by Calenorn View Post
Exactly. But because the book list shows ALL the just side-loaded books, we can be certain that they've all completed the thumbnail generation process.

If someone does this and the device still causes an error, then something else is going on, yes?
Actually, if that is your concern, you explicitly do not want to do this. As I said, the covers are generated on demand. If you open the book list, then the covers for the five books displayed will be generated. As well as those for the home screen. That means more covers, more time, and if this is actually the problem, more chance of it going wrong. If you need to reconnect, wait on the home screen for a couple of minutes.
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Old 02-18-2022, 03:59 PM   #385
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Question: How does cover generation work if the Calibre driver is set to send it?

I just sent a new book to device and I did not see it switch from a generic cover to the embedded one.
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Old 02-18-2022, 09:57 PM   #386
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Quote:
Originally Posted by ownedbycats View Post
Question: How does cover generation work if the Calibre driver is set to send it?

I just sent a new book to device and I did not see it switch from a generic cover to the embedded one.
If you have the cover options turned on in the driver, the driver will generate the covers from the covers shown in the library and put them on the device. The device will use them.
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Old 02-19-2022, 12:40 AM   #387
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Originally Posted by davidfor View Post
If you have the cover options turned on in the driver, the driver will generate the covers from the covers shown in the library and put them on the device. The device will use them.
Note that while the covers in the library typically are extracted or derived from what is in the book, they can be replaced without affecting the book.

Also, the KoboUtilities plugin can also upload the covers in Calibre's library after the book is already on the device.

Either way, you can have a cover from Calibre on the device that is different from the cover embedded in the book.

I frequently replace covers that are ugly or have fonts too small to see in the device cover thumbnails, etc., and typically do not embed them in the book.
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Old 02-19-2022, 03:38 PM   #388
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Another update: I accidentally connected with a kepub open. Aside from the usual scan&fix prompt, my Kobo stopped saving the reading position after I disconnected.

No further problems after a reboot, thankfully.

Is anybody else able to confirm this?
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Old 02-20-2022, 09:53 AM   #389
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Ended up downgrading to 4.30 after I got a database corruption today (I/O error according to Calibre - thankfully I keep backups, so I didn't have to reset my ereader). I sent over some books yesterday and then it happened when I reconnected it today, with everything have been imported long before I did. No books open either, I was on the home screen.

I hadn't noticed before but with 4.31, besides the random freezes, I kept having problems connecting the device to my computer - the 'Connect' popup wouldn't appear immediately, or if it did it sometimes it would disappear, or the screen would sort of flash twice before connecting... I was sure it was the cable (though I was using the one that came with the Libra), but downgrading fixed all of these problems immediately.

Also, my reading progress was always saved correctly and Windows never prompted me to 'scan & fix' the device.
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Old 02-20-2022, 08:29 PM   #390
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4.31 should have been pulled 3 pages of comments ago.
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