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Old 07-07-2016, 11:40 AM   #1
shoelesshunter
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OPDS / missing Kindle covers

All of my books are in the same azw3 format and all have covers in their Calibre database. However, when I use the Calibre OPDS server to download the books to my Kindle Voyage, thumbnail covers randomly fail to show up on the device.

When loaded via USB, all have covers. When downloaded from the content server, only *some* have covers and I can't figure out what the x-factor is in the equation.

Suggestions?
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Old 07-07-2016, 12:32 PM   #2
eschwartz
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Because the Kindle only extracts thumbnails for books that show up as a "Personal Document".

Otherwise, it expects the book to be downloaded from Amazon's servers, which means it ignores the embedded metadata cover and attempts to use the exth 113 (ASIN) metadata field locate the ebook via Product ID on Amazon's servers, and download a cover thumbnail from there.

...

When using calibre's Send-to-Device option, calibre will sideload a cover thumbnail together with the ebook itself.

But books downloaded via the builtin browser or sideloaded manually via USB though copy-paste in the File Browser do not enjoy that workaround, so this Kindle bug strikes.
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Old 07-08-2016, 03:39 AM   #3
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thank you for the explanation. that makes sense.
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