Embedding metadata

Rellwood · 02-03-2018, 07:21 PM

exactly what metadata gets embedded in a book? Custom Columns?

ilovejedd · 02-03-2018, 08:46 PM

All the regular metadata and custom columns.

The custom columns are stored in the opf as, for example:

Code:

<meta name="calibre:user_metadata:#genre" content="some really long text that's hard to read due to html entities"/>

Note, calibre leaves the original books as-is unless one intentionally embeds metadata (e.g. Quality Check plugin), converts, save to disk, etc.

kovidgoyal · 02-04-2018, 01:26 AM

Depends on the book format. Some formats can handle more metadata than others. EPUB and PDF store all metadata, including custom columns, other formats, less.

Rellwood · 03-08-2018, 08:43 PM

I know this was a long time to reply, but you have just saved me some serious time....

Knowing the epubs can hold all the custom columns, thanks!

dwig · 03-08-2018, 11:09 PM

Keep in mind that calibre doesn't embed any metadata unless you take some specific action. Normally, calibre reads the metadata from the book when added to the library and stores this in its own database. All subsequent edits are stored in the database. The data only gets written back into the ebook files(s) when specific action is taken.

Actions that write to the ebook files are the various "polish" functions including plugins, format conversion (data written into the new file but not the original), Save to disk, and Save to device. If you (are foolish enough to) sneak into the library's folder structure to manually copy out a book, that file will not have any of the edited or added metadata unless you've used one of the "polish" functions.

02-03-2018, 07:21 PM	#1
Rellwood Library Breeder (She/Her) Posts: 1,301 Karma: 1937893 Join Date: Apr 2015 Location: Fullerton, California Device: Paperwhite 2015 (2), PW 2024 (12 GEN), PW 2023 (11 GEN), Scribe (1st)	Embedding metadata exactly what metadata gets embedded in a book? Custom Columns?

02-03-2018, 08:46 PM	#2
ilovejedd hopeless n00b Posts: 5,126 Karma: 19597086 Join Date: Jan 2009 Location: in the middle of nowhere Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9	All the regular metadata and custom columns. The custom columns are stored in the opf as, for example: Code: <meta name="calibre:user_metadata:#genre" content="some really long text that's hard to read due to html entities"/> Note, calibre leaves the original books as-is unless one intentionally embeds metadata (e.g. Quality Check plugin), converts, save to disk, etc. Last edited by ilovejedd; 02-03-2018 at 08:48 PM.

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02-04-2018, 01:26 AM	#3
kovidgoyal creator of calibre Posts: 45,609 Karma: 28549044 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Depends on the book format. Some formats can handle more metadata than others. EPUB and PDF store all metadata, including custom columns, other formats, less.

03-08-2018, 08:43 PM	#4
Rellwood Library Breeder (She/Her) Posts: 1,301 Karma: 1937893 Join Date: Apr 2015 Location: Fullerton, California Device: Paperwhite 2015 (2), PW 2024 (12 GEN), PW 2023 (11 GEN), Scribe (1st)	I know this was a long time to reply, but you have just saved me some serious time.... Knowing the epubs can hold all the custom columns, thanks!

03-08-2018, 11:09 PM	#5
dwig Wizard Posts: 1,613 Karma: 6718541 Join Date: Dec 2004 Location: Paradise (Key West, FL) Device: Current:Surface Go & Kindle 3 - Retired: DellV8p, Clie UX50, ...	Keep in mind that calibre doesn't embed any metadata unless you take some specific action. Normally, calibre reads the metadata from the book when added to the library and stores this in its own database. All subsequent edits are stored in the database. The data only gets written back into the ebook files(s) when specific action is taken. Actions that write to the ebook files are the various "polish" functions including plugins, format conversion (data written into the new file but not the original), Save to disk, and Save to device. If you (are foolish enough to) sneak into the library's folder structure to manually copy out a book, that file will not have any of the edited or added metadata unless you've used one of the "polish" functions.

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