Calibre and metadata embedding

paoletto · 10-29-2014, 02:26 PM

Hi,
I'm new of calibre, and i'm liking it. However there are a couple of things i do not fully understand:

1) How does Calibre embed metadata into files? does it use adobe xMP? or does it use specific file format facilities for metadata?

2) How does Calibre read embedded metadata from files? can it read xMP metadata, or does it read only specific formats' metadata?

3) It seems to me that calibre cannot embed metadata in all file formats.
For example djvu and chm seems to not retain the metadata upon saving to disk. Is this documented somewhere? and also, does this mean calibre does not export into xMP?

thanks!

theducks · 10-29-2014, 05:18 PM

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eschwartz · 10-29-2014, 10:19 PM

I believe calibre can read and save xmp metadata for PDF.

For the usual ebook formats, MOBI, EPUB and AZW3, there are documented internal metadata formats.

EPUB uses Dublin Core attributes in the OPF inside the EPUB container.
AZW3 and MOBI use the mobipocket exth fields, which are database records.

I am not sure djvu and chm support metadadata. It really is up to the individual format specs.

10-29-2014, 02:26 PM	#1
paoletto Member Posts: 11 Karma: 10 Join Date: Oct 2014 Device: Nexus 10	Calibre and metadata embedding Hi, I'm new of calibre, and i'm liking it. However there are a couple of things i do not fully understand: 1) How does Calibre embed metadata into files? does it use adobe xMP? or does it use specific file format facilities for metadata? 2) How does Calibre read embedded metadata from files? can it read xMP metadata, or does it read only specific formats' metadata? 3) It seems to me that calibre cannot embed metadata in all file formats. For example djvu and chm seems to not retain the metadata upon saving to disk. Is this documented somewhere? and also, does this mean calibre does not export into xMP? thanks!

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10-29-2014, 05:18 PM	#2
theducks Well trained by Cats Posts: 31,267 Karma: 61916422 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Moderator Notice Moved out of Development. Pleas read stickies before posting in sections

10-29-2014, 10:19 PM	#3
eschwartz Ex-Helpdesk Junkie Posts: 19,421 Karma: 85400180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	I believe calibre can read and save xmp metadata for PDF. For the usual ebook formats, MOBI, EPUB and AZW3, there are documented internal metadata formats. EPUB uses Dublin Core attributes in the OPF inside the EPUB container. AZW3 and MOBI use the mobipocket exth fields, which are database records. I am not sure djvu and chm support metadadata. It really is up to the individual format specs.