XMP Metadata in PDF - differents functions

[tribbleoo]

Hello,
can somebody explain me the different between these 2 functions?
1. I activate in Preferences "Embed metadata".
2. I import the example "Interface Demo Plugin" from the manual.
3. I create custom fields in calibre. Now i want to write the data/metadata to my pdf.
Test 1:
=====
First i try the function "Embed metadata" and check my pdf. No new metadata included.
Test 2:
=====
In the "Interface Demo Plugin" is a button "Update metadata in a book's files". I try this button and now are my metada was written direct without doing something else.

Question: Why? What are the difference of these functions or why this don't work also with the "Embed metadata" Button?

Best regards

[BetterRed]

Embed in PDF works for me, what are you using to examine the PDF, this is from PDF xChange Document properties:



BR

[tribbleoo]

Hello,
thanks for the quick response. I think to explain more in detail
1. System: Windows 10 / Calibre 8.3.0
2. Testfile
https://www.uni-muenster.de/imperia/...ungen_pdfa.pdf
3. Preferences (see pictures 001,002,003)
4. Resluts with "Embed metadata" (004) and "Interface Demo Plugin" (005)
I also use PDF-XChange Editor.

[tribbleoo]

thx for quick response. i already answer, but i cant't find the post.
again.
System: Win10 / Calibre 8.3.0
Preferences: Pic 001,002,003
Results with PDF-XChange Editor: Pic 004,005

[tribbleoo]

here the pics

[tribbleoo]

Here the informations.
System: Windows 10 / Calibre 8.3.0
Preferences: Pic 001,002,003
Results with PDF-XChange Editor
"Embed metadata" Pic004
"Update metadata in a book's files" Pic005

[BetterRed]

Click the '>' at the start of the "http://calibre-ebook.com…" line in that last screen shot, or press the right arrow key. Ditto when you see the custom columns line.

BR

Moderator Notice
For some reason best known to Mr Flay of Gormenghast Castle your replies were falling into the moderation bucket.

[tribbleoo]

Hello,
thx again.
i try to explain again.
- Download the example file from the link below (or any other pdf).
- Set the preferences like in Pics 001 - 003
- Drag&Drop the pdf in Calibre
- add some custom data
- push "Embed metadata" Button.
- check the metadata in pdf file
Can u realy confirm, that now already all custum data was written to the pdf file?

To your response:
yes thats the result, after i pushed the "Update metadata in a book's files" button and yes there are now the customs data inside the pdf. Yes i can explore that row with the > arrow.

But how about the result of the "Embed metadata" Button? Why they have different functions? I have think, that after push this button, there also will written the data directly to the pdf. As you see in Pic004, there are no "http://calibre-ebook.com…" line. Thats what i mean.
I hope i explaint it more clearly now.
thx

[tribbleoo]

Hello,
ok, here one more check with the calibre "ebook-meta" function.

1.
- check metadata from the file with "ebook-meta file.pdf"
- change in calibre the custum data
- push "Embed metadata" Button
- check metadata again with "ebook-meta"
Result: no data changes

2.
- check metadata from the file with "ebook-meta file.pdf"
- change in calibre the custum data
- push "Update metadata in a book's files" button
- check metadata again with "ebook-meta"
Result: data changes

Whats the different?
thx and best regards

[BetterRed]

Where is the "Update metadata in a book's files" button. If you mean this button:



That button extracts the standard metadata from the format file and writes it to the database - it does NOT update the format files. Maybe the tooltip has been poorly translated.

Set metadata for the book from the selected format

BR

[tribbleoo]

Hello,
as i wrote in my first post, this button can found inside the sample from manual creating plugins.

https://manual.calibre-ebook.com/creating_plugins.html
└ https://calibre-ebook.com/downloads/...emo_plugin.zip

[BetterRed]

Ask Kovid, he wrote it. Until now I never heard of it.

This is not a conversion issue, it's more of a development issue. So I'll move the thread to the Development at subforum.

BR

[tribbleoo]

Hello,
please don't missunderstood.
I also found this sample plugin randomly while i playing around with calibre. So i saw the button and checked it. After that i found out the difference of the functions.

@Kovid
It is possible to implement the function like it work in the example ("Interface Demo Plugin") to the "Embed metadata" button?

thx again to @BetterRed for spent your time to response my posts

[kovidgoyal]

They use the same function.

[tribbleoo]

Hello,

@Kovid thx for the quick response. But why are results different?

You can prove the results for your own.

I think with the "ebook-meta" function you can see it definitv.