[Digikam-users] 2 problems tagging multiple images

Gilles Caulier caulier.gilles at gmail.com
Thu May 22 06:22:35 BST 2014

An XMP namespace URI is not registered by Exiv2, and library do know
how to manage it.

digiKam do not manage XMP namespace registration. All is done by Exiv2
by default.

We can do it, just to declare URI, but structure managed into are unknow.

The Q is w : which XMP namespace generate this error ?

I recommend to report this problem to Exiv2 project, including image
with metadata to investiguate.


Gilles Caulier

2014-05-21 23:35 GMT+02:00 Phil <philtuckey at free.fr>:
> I went back to 3.5.0 to do more testing and I found both the problems which
> I described below for 4.0.0. (Both running on OSX 10.9.2.)
> When sidecars are truncated, I see the following error messages on stdout:
> digikam(21240)/KEXIV2
> KExiv2Iface::KExiv2::Private::printExiv2MessageHandler: Exiv2 ( 3 ) : XMP
> Toolkit error 101: Unregistered schema namespace URI
> digikam(21240)/KEXIV2
> KExiv2Iface::KExiv2::Private::printExiv2MessageHandler: Exiv2 ( 3 ) : Failed
> to encode XMP metadata.
> digikam(21240)/KEXIV2 KExiv2Iface::KExiv2::save: Metadata for file '
> "20140101-144225-IMG_4657.jpg" ' written to XMP sidecar.
> I don't see any error messages on stdout which correspond to the other
> problem, when XMP metadata in the image file is not updated.
> I have done more testing with 3.3.0 on ubuntu 12.04 and have not been able
> to provoke these problems.
> Philip
> On 19/05/14 23:24, Phil wrote:
>> Hi
>> I meet the following problems when tagging multiple images at the same
>> time, in both 4.0.0 and 4.1.0. I don't see this problem in a 3.3.0 which
>> I happen to have on another machine. Anyone else see this?
>> How to generate:
>> Select 10 images.
>> Apply a tag to all.
>> Problem 1, XMP metadata not always updated in image files:
>> When writing metadata to the image files, dk occasionally omits to write
>> the new XMP metadata, leaving the previous XMP metadata in the image
>> file. This can be seen by for example by tag fields not being updated
>> when tags are changed and applied. You have to look through the images
>> one-by-one to find one or two where this has happened. (The IPTC
>> metadata is always written correctly, so when this happens there is a
>> difference between the IPTC:Keywords (tags) field and the various XMP
>> tags fields.)
>> Problem 2, xmp sidecars sometimes truncated:
>> Occasionally one or more of the xmp sidecars is truncated to just its
>> first line, with a size of only 39 bytes. (Use a file manager to see
>> that this has happened.)
>> If the problems don't show up the first time, change the tags and then
>> re-apply. Over 2 or 3 cycles I always see both problems appear.
>> I see this behaviour when 10 (or more) images are selected. I have not
>> seen it with only 1 or 2 images selected. I haven't checked in between.
>> The problems appear random. A file which has a problem the first time
>> usually doesn't have it after tagging a second time.
>> The problems appear to be independent, i.e. when writing metadata to
>> both sidecars and image files, they don't occur together, they affect
>> different images.
>> Regards
>> Philip
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>> Digikam-users at kde.org
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