Bug 437194

Summary:	xmp-video namespace
Product:	[Applications] digikam	Reporter:	herb <herb.k>
Component:	Metadata-Xmp	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	REPORTED ---
Severity:	wishlist	CC:	caulier.gilles, metzpinguin
Priority:	NOR
Version First Reported In:	7.3.0
Target Milestone:	---
Platform:	Other
OS:	Other
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description herb 2021-05-16 10:21:16 UTC

SUMMARY
Hello,

working on German translation I also played with "Date and Time" and checkbox XMP-Video.
So I have seen that digiKam writes XMP metadata in xmp-video namespace.

I have never heard about this namespace; also Exiftool does not know about.
Can someone help and give some documentation about this namespace and which fields belong to it.

Thanks in advance
herb

STEPS TO REPRODUCE
1. 
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3. 

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Comment 1 caulier.gilles 2021-05-16 14:37:23 UTC

digiKam use Exiv2 library internally to manage metadata. Xmp.video.* tags are defined here :

https://github.com/Exiv2/exiv2/blob/main/src/properties.cpp#L131

Implementation :

https://github.com/Exiv2/exiv2/blob/main/src/properties.cpp#L1324

Gilles Caulier

Comment 2 caulier.gilles 2021-05-16 15:06:35 UTC

MAik,

I don't know where Xmp.video.* tags come from in point of view of definition (aka http://www.video in Exiv2 source code), but it sound like a pure invent from Exiv2 team... Right ?

Same for Xmp.audio.* namespace ...

We need to be fully compatible with ExifTool, and this one the most near of Xmp.video.* is Xmp.xmpDM.* and Xmp.xmpMM.*

https://github.com/Exiv2/exiv2/blob/main/src/properties.cpp#L108
https://github.com/Exiv2/exiv2/blob/main/src/properties.cpp#L334

https://github.com/Exiv2/exiv2/blob/main/src/properties.cpp#L105
https://github.com/Exiv2/exiv2/blob/main/src/properties.cpp#L108

...Which are present in ExifTool.

If i'm right, well all Xmp.video.* tags in digiKam must be moved to the right standard namespace. And of course an issue must be filled to Exiv2 bugzilla on github. 

Gilles

Comment 3 Maik Qualmann 2021-05-16 15:23:47 UTC

Hi Gilles,

Yes, I have already searched whether I can find a reference for xmp.video or xmp.audio. It only seems to exist in Exiv2. But an xmp.video.DateTimeOriginal is also recognized by ExifTool and displayed as a DateTimeOriginal (no further metadata in the image). I also think that the Adobe standard would be xmpDM or xmpMM.

Maik