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Old 04-23-2021, 02:35 AM   #1
kandwo
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Koreader not able to read fb2 within zip on Hisense A5 Pro

I use Koreader on both my Hisense A5 Pro and Nova 3 and sync the progress between them. I recently started reading a book (zip compressed fb2) on my Nova 3. When I tried opening the same file on my A5 Pro Koreader shows the message "(no book information: not readable by engine)" in the file browser. When clicking on the file it displays "No reader engine for this file or invalid file."

Some of the zipped fb2 files show up just fine on the A5. All of the files work perfectly on the Nova 3.

I tried unzipping the file on the A5 and the resulting fb2 opened up just fine. But it wouldn't sync the progress with the still zipped fb2 file on my Nova 3, of course.

What could the reason for this be? I'm confused since I use the latest Koreader from F-droid on both devices and the same files.

EDIT: I thought the files might have corrupted somehow when being transferred to the A5, but they opened up just fine in Alreader X, so that doesn't seem to be it either..

Last edited by kandwo; 04-23-2021 at 06:23 AM.
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Old 04-23-2021, 03:09 PM   #2
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Could it be that you previously used "open with" on the device where it's working to force a specific engine?
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Old 04-23-2021, 04:21 PM   #3
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Originally Posted by Frenzie View Post
Could it be that you previously used "open with" on the device where it's working to force a specific engine?
Do you mean from a file browser? Certainly not for these files, and I don't recall having done that in general either. I tend to open my files directly through the reader apps, Koreader, Alreader X, etc. And these files had not been opened through any other app than Koreader before - I successfully tried opening one of the files in Alreader X only after having it refusing to work in Koreader.

I tried opening a file browser now and choosing Koreader from the "open with" menu only to get the same error message.

Did I understand your message correctly? Otherwise, please, clarify
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Old 04-23-2021, 04:43 PM   #4
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If you had forced MuPDF instead of crengine or vice versa it could explain different behavior. Other files do open? There is no reason the program itself should behave any differently.
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Old 04-24-2021, 02:11 AM   #5
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Originally Posted by Frenzie View Post
If you had forced MuPDF instead of crengine or vice versa it could explain different behavior. Other files do open? There is no reason the program itself should behave any differently.
Do you mean within Koreader itself? If so, I have no idea how to do that and haven't done it manually. Is it possible to check which engine is in use?

I would say that about a third of the files show these errors in the file browser within Koreader. All of those files are zipped fb2, which at first I thought was the problem; but the files that do open are in the same format... And there doesn't seem to be anything wrong with the files since unzipping them manually and then reading the resulting fb2 works in Koreader. They work without unzipping on Alreader X on the same device, and also open just fine on Koreader on my Nova 3.

Could there have been a problem when indexing the files or something? Is there a way to tell Koreader to refresh the database or is this something that is done automatically?
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Old 04-24-2021, 12:57 PM   #6
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Check the engine in use: Long-press on the file, Open with.

There's absolutely no indexing involved in any of this (or, much of anything, actually ^^).

You could check the logcat after switching to verbose debug mode, that might shed some light on why it's failing to load (fair warning: or not ^^).
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Old 04-24-2021, 03:40 PM   #7
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Originally Posted by NiLuJe View Post
Check the engine in use: Long-press on the file, Open with.

There's absolutely no indexing involved in any of this (or, much of anything, actually ^^).

You could check the logcat after switching to verbose debug mode, that might shed some light on why it's failing to load (fair warning: or not ^^).
That's it! Thank you! Now it finally works again. For some reason it did try to open it with the MuPDF engine (altough I haven't changed it to that manually). I chose the Cool reader one and everything opened just fine

My goodness, all these long presses and hidden features of this app.. I hope I learn to fully use it someday!
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