[Digikam-users] Tags not written to XMP sidecar?
Anders Kamf
digikam at kamf.se
Wed May 25 20:08:26 BST 2016
Hi,
Thanks again for the ideas! This is my setup, a few differences in versions
can be noted.
Laptop version - where I do initial tagging of my photos before moving them
to my server for long term storage:
digiKam version 4.14.0
Exiv2 can write to Jpeg: Yes
Exiv2 supports XMP metadata: Yes
LibExiv2: 0.25
LibKDE: 4.14.13
LibKExiv2: 2.4.0
Windows "client" version from where I access my photos on the server:
digiKam version 4.10.0
Exiv2 can write to Jpeg: Yes
Exiv2 supports XMP metadata: Yes
LibExiv2: 0.24
LibKDE: 4.10.2
LibKExiv2: 2.4.0
I have tried som different settings with the rescan setting without any
help. I don't like to mix with timestamp nor the writing of metadata to
file setting as that could impact my workflow and my collection.
I'll guess I have to wait until newer versions comes around and hopefully
the problem is gone.
BR
Anders
2016-05-24 8:16 GMT+02:00 Andreas Mair <amair.sob at gmail.com>:
> Hi Anders,
>
> I'd suggest to check installed versions on both computers. You'll find it
> in digiKam's "Help" menu. On my system it reads:
> digikam 4.14.0
> libexiv2 0.25
> libkde 4.14.16
> libkexiv2 2.4.0
> I strongly recommend to install the latest because I used to have
> miscellaneous problems with older releases.
>
> I don't have "Write to sidecar files": "Write to XMP sidecar file for
> read-only image only" like you. I've set it to "Write to XMP sidecar only".
> Have you played with the options "Update the timestamp when files are
> modified" and "Rescan file when files are modified"?
> Just some ideas...
>
> Best regards,
> Andreas
>
>
> 2016-05-23 22:26 GMT+02:00 Anders Kamf <digikam at kamf.se>:
>
>> Hi Andreas,
>>
>> Thanks for the suggestion. Interesting indeed.
>> It shows that all my xmp files are nearly empty, they contain only one
>> row, e.g.:
>> <?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
>>
>> But if I select two or more files in digikam and press “Write metadata to
>> each file” - voila, the metadata is written and accessible from exiftool
>> and possible to read in clear text with a text editor (the option to write
>> is greyed out if only one file is selected).
>>
>> So… How come the metadata is not written when I apply tags to the movie
>> file, like it is when I apply them to a JPG?
>> Unless there is some option in the settings that I have missed, I guess
>> it is a bug. It seems like the xmp file is created once but empty and never
>> updated to contain any data until manually selecting “Write metadata to
>> each file”.
>>
>> From now on I at least know how to make sure that the metadata is written
>> for video files also, even if it is an extra step in the workflow.
>>
>> One problem remains as well, digikam on my other computer still doesn’t
>> read the metadata from the movie file even if I select “Read metadata from
>> each file to database” (I have the “Read from sidecar files” option
>> checked”).
>>
>> Thanks for all tips and suggestions so far!
>>
>> BR
>> Anders
>>
>>
>> 2016-05-23 7:52 GMT+02:00 Andreas Mair <amair.sob at gmail.com>:
>>
>>> Hi Anders,
>>>
>>> > Since I don't find the data in the .xmp with niether exiv2 nor
>>> exiftool, it seems like a problem to write.
>>>
>>> have you tried to open the xmp file using your favorite text editor?
>>> It's a simple text file (XML based) so you can see if data is written or
>>> not.
>>> I've checked the movies I tagged yesterday and the xmp files contain
>>> data (my keywords for example).
>>>
>>> I don't know how to extract the data using exiv2 or exiftool.
>>> Maybe your exiv2 or libexiv2 are too old?
>>>
>>> Best regards
>>> Andreas
>>>
>>>
>>>
>>> 2016-05-22 22:36 GMT+02:00 Anders Kamf <digikam at kamf.se>:
>>>
>>>> Hi!
>>>>
>>>> Since I don't find the data in the .xmp with niether exiv2 nor
>>>> exiftool, it seems like a problem to write. The .cmp is created by digikam
>>>> though, so it writes something. But not the tags which it writes to a
>>>> jpg-file as it seems. It can of course also be that those two programs
>>>> cannot extract that specific data, but even if so digikam should be able to.
>>>>
>>>> Regarding reading metadata it is the same for jpg as for xmp, digikam
>>>> doesn't re-read metadata of a file in that is present in its database
>>>> unless manually told to. It won’t automatically recognize that a file is
>>>> updated outside digikam.
>>>> (Also, when triggered to re-read digikam appends the metadata of the
>>>> file to the metadata already in the database, i.e. it is not possible to
>>>> delete a tag outside digikam and expect it to disappear when re-reading the
>>>> metadata. As designed.)
>>>>
>>>>
>>>> BR
>>>> Anders
>>>>
>>>> 2016-05-22 17:34 GMT+02:00 Martin (KDE) <kde at fahrendorf.de>:
>>>>
>>>>> Hallo
>>>>>
>>>>> So is it a problem in writing the xmp file or reading from them on the
>>>>> new location?
>>>>>
>>>>> I have simmilar problems. Digikam writes xmp files quite fine, but
>>>>> never
>>>>> reads from xmp automatically if they are changed by another program
>>>>> (like darktable). I have to sellect the album/file and hit reread
>>>>> metadata from external file to get it working.
>>>>>
>>>>> I hope this will be fixed in upcomming digikam 5.
>>>>>
>>>>> Regards
>>>>> Martin
>>>>>
>>>>>
>>>>> Am 22.05.2016 um 17:01 schrieb Anders Kamf:
>>>>> > Hi,
>>>>> >
>>>>> > Thanks for your reply Tobias! I'm afraid it doesn't solve the
>>>>> problem or
>>>>> > answers the questions though.
>>>>> >
>>>>> > I indeed write meta data to JPG files, including tags, have done so
>>>>> > since 2009 and it works very well. Sidecar files are created by
>>>>> digikam
>>>>> > for files it cannot write meta data into, e.g. video files, the
>>>>> settings
>>>>> > was described in my initial post. It is from those Filename.mp4.xmp
>>>>> or
>>>>> > Filename.mov.xmp I have tried with both exiv2 and exiftool to extract
>>>>> > the tags.
>>>>> >
>>>>> > I'm moving files from my laptop to my server once I have done tagging
>>>>> > etc (laptop is used because I travel a lot). I usually use rsync,
>>>>> i.e.
>>>>> > the move is done outside digikam. The photo collection on my servers
>>>>> is
>>>>> > accessed with "another" digikam from a desktop PC (Windows) and from
>>>>> a
>>>>> > stand alone Ubuntu (both with setting "Read from sidecar files)".
>>>>> Both
>>>>> > have their own digikam database, hence all the meta data needs to
>>>>> travel
>>>>> > with the files.
>>>>> >
>>>>> > The main question, I'd guess, is whether to expect that the meta
>>>>> data of
>>>>> > the xmp file corresponds to the one of the jpg file in terms of tags,
>>>>> > rating etc.?
>>>>> >
>>>>> > Regards
>>>>> > Anders
>>>>> >
>>>>> >
>>>>> > 2016-05-22 15:31 GMT+02:00 Tobias Margiani <margianit at gmail.com
>>>>> > <mailto:margianit at gmail.com>>:
>>>>> >
>>>>> > Hi,
>>>>> >
>>>>> > I'm not sure if I understand your problem correctly. Are XMP
>>>>> files
>>>>> > created but
>>>>> > without (the right) content or are there no XMP files at all (you
>>>>> > could check
>>>>> > that with a file manager)?
>>>>> > I don't use XMP files normally so there might be people who know
>>>>> all
>>>>> > this
>>>>> > better but from a few quick tests it looks like exiftool only
>>>>> reads
>>>>> > xmp files
>>>>> > if you pass them as argument directly and not if you try to read
>>>>> > tags from an
>>>>> > image file (e.g. if you have image.jpg and image.xmp you have to
>>>>> use
>>>>> > "exiftool
>>>>> > image.xmp" to read the tags). In my checks there is a "Tags
>>>>> List" entry
>>>>> > showing the digikam tags.
>>>>> > To comment on you problem when moving the files. If you only
>>>>> moved
>>>>> > image files
>>>>> > the metadata might indeed be lost but if you have moved the whole
>>>>> > folder the
>>>>> > xmp files could still be there! So check with a file manager.
>>>>> That
>>>>> > the tags
>>>>> > aren't read by digikam may result from your configuration. Are
>>>>> you
>>>>> > sure that
>>>>> > you've configured digikam to read metadata from sidecar files.
>>>>> > Another source of this problem may be that you haven't configured
>>>>> > digikam to
>>>>> > write Tags into file at all. You can check in the metadata tab
>>>>> what
>>>>> > information
>>>>> > is written to the files.
>>>>> >
>>>>> > I hope some of this could help.
>>>>> > Regards
>>>>> > Tobias
>>>>> >
>>>>> > Am Samstag, 21. Mai 2016, 10:12:13 CEST schrieb Anders Kamf:
>>>>> > > Hi!
>>>>> > >
>>>>> > > I have the setting "Write to sidecar files": "Write to XMP
>>>>> sidecar
>>>>> > file for
>>>>> > > read-only image only", which creates xmp sidecar files for the
>>>>> > movie files
>>>>> > > that are in my collection.
>>>>> > > Now, I thought that this would mean that the tags applied to
>>>>> those
>>>>> > movies
>>>>> > > was written to the XMP sidecar file. But that seems not to be
>>>>> the
>>>>> > case! I
>>>>> > > now realise that at least neither exiv2 nor exiftool finds
>>>>> those tags.
>>>>> > > Also, when I access the file from "another" digikam on another
>>>>> > computer, no
>>>>> > > metadata seems to be found.
>>>>> > >
>>>>> > > If this is true, it means that all metadata for those files
>>>>> have
>>>>> > been lost
>>>>> > > when I have moved the files outside Digikam (to another
>>>>> server), which
>>>>> > > truly is a sad awakening.
>>>>> > >
>>>>> > > Is this the intended behaviour, or is it a bug? Or am I doing
>>>>> > something
>>>>> > > wrong (a user-fault...)?
>>>>> > >
>>>>> > > I'm using digikam 4.14.10 on Ubuntu 15.10.
>>>>> > >
>>>>> > > Best regards
>>>>> > > Anders
>>>>> >
>>>>> >
>>>>> > _______________________________________________
>>>>> > Digikam-users mailing list
>>>>> > Digikam-users at kde.org <mailto:Digikam-users at kde.org>
>>>>> > https://mail.kde.org/mailman/listinfo/digikam-users
>>>>> >
>>>>> >
>>>>> >
>>>>> >
>>>>> > _______________________________________________
>>>>> > Digikam-users mailing list
>>>>> > Digikam-users at kde.org
>>>>> > https://mail.kde.org/mailman/listinfo/digikam-users
>>>>> >
>>>>>
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>>>>
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