Content OPDS / missing Kindle covers

shoelesshunter · 07-07-2016, 11:40 AM

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?

eschwartz · 07-07-2016, 12:32 PM

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.

shoelesshunter · 07-08-2016, 03:39 AM

thank you for the explanation. that makes sense.

07-07-2016, 11:40 AM	#1
shoelesshunter copyleft librarian Posts: 58 Karma: 10 Join Date: Nov 2015 Device: KV	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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07-07-2016, 12:32 PM	#2
eschwartz Ex-Helpdesk Junkie Posts: 19,422 Karma: 85397180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	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.

07-08-2016, 03:39 AM	#3
shoelesshunter copyleft librarian Posts: 58 Karma: 10 Join Date: Nov 2015 Device: KV	thank you for the explanation. that makes sense.