Thread: How does Calibre recognise books on device / Kobo Kepub-Epub (not) linked
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Old 06-01-2018, 11:38 PM   #5
davidfor
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Join Date: Jul 2011
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Quote:
Originally Posted by Mrs_Often View Post
Thanks for your quick reply, Kovid! You recalled correctly... all matched books in the 'In Library' column in the Device view all state "UUID"... I don't really understand. Why would the two Emma books, both downloaded from Kobo (from different accounts) have different UUIDs?

Assuming I can't mess with UUIDs to match books up, what metadata is used for speculative matching?
The match with "UUID" means that calibre has either previously matched the books and stored this in the metadata.calibre file, or that there is an id in the book that matches with an id in calibre. Odds are a book downloaded from Kobo directly to the device won't have a UUID that matches a book downloaded by other methods and added to the calibre library.

Otherwise, as Kovid said, the matching is on the title and the authors. These need to be an exact match. The extra stuff put in the titles by all the publishers and stores cause a problem with this. Plus the way Kobo handles multiple authors causes problems with the matching especially for sideloaded books.

There have been a couple of recent threads on this where I made some suggestions on how to handle this. Beyond those suggestions, I haven't been able to come up with a way to improve the matching and have to manually match the books. After that, the books stay matched on each connection.
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