metadata.calibre growing large

Agama · 11-01-2011, 03:45 PM

The metadata.calibre file on the root of my device is now larger, (0.5MB and growing), than most of my individual books, (typically < 0.3MB), and the largest sections within it are "thumbnail": [ ... ] sections. However, some of these sections simply contain the word null whereas others have many lines of 'gibberish' (jpg data?). Can I set them all to null without stopping this file from doing whatever it does? Why have some books got such data and others not?

kovidgoyal · 11-01-2011, 11:07 PM

Because yur device has thumbnails for some books and not for others. You can set them to null, it will revent calibre from dispaying covers inthe device view, but should not have any other major side effects

Agama · 11-02-2011, 08:12 AM

What generates thumbnails for books? Is this thumbnail the same as the cover shown in the Book Details area of the the library? All my books are ePub and nearly all from calibre conversion so I'm not sure how I've triggered thumbnails for some and not others.

kovidgoyal · 11-02-2011, 08:44 AM

On sony devices the thumbnails are taken from the xml database of thumbnails on the SONY itself.

11-01-2011, 03:45 PM	#1
Agama Guru Posts: 776 Karma: 2751519 Join Date: Jul 2010 Location: UK Device: PW2, Nexus7	metadata.calibre growing large The metadata.calibre file on the root of my device is now larger, (0.5MB and growing), than most of my individual books, (typically < 0.3MB), and the largest sections within it are "thumbnail": [ ... ] sections. However, some of these sections simply contain the word null whereas others have many lines of 'gibberish' (jpg data?). Can I set them all to null without stopping this file from doing whatever it does? Why have some books got such data and others not?

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11-01-2011, 11:07 PM	#2
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Because yur device has thumbnails for some books and not for others. You can set them to null, it will revent calibre from dispaying covers inthe device view, but should not have any other major side effects

11-02-2011, 08:12 AM	#3
Agama Guru Posts: 776 Karma: 2751519 Join Date: Jul 2010 Location: UK Device: PW2, Nexus7	What generates thumbnails for books? Is this thumbnail the same as the cover shown in the Book Details area of the the library? All my books are ePub and nearly all from calibre conversion so I'm not sure how I've triggered thumbnails for some and not others.

11-02-2011, 08:44 AM	#4
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	On sony devices the thumbnails are taken from the xml database of thumbnails on the SONY itself.

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