[Digikam-users] 2 problems tagging multiple images

[Phil]

If dk is using the exiv2 I have installed from MacPorts then no, 3.5.0, 
4.0.0 and 4.1.0 are all using the same version (0.24), I have compiled 
them all recently.

Because of what I wrote below, it looks as though there is "random" 
corruption in metadata by the time it reaches the place in libexiv2 
which is generating the error message. This corruption could be 
happening within libexiv2, or it might be in dk before giving the data 
to libexiv2.

When we select and tag many images, does dk give libexiv2 the tags only 
once and a list of images to apply them to, or does it give the tags 
separately for each image? In the first case, any corruption must be in 
libexiv2. In the second case, it could be in libexiv2 or dk. (I'm not 
used to looking through complex code bases, it will take me some time 
just to find where this is happening...)

Philip

On 22/05/14 09:16, Gilles Caulier wrote:
> The difference must be Exiv2 shared lib which can be updated between 2
> digiKam versions.
>
> Go to Help/Components info dialog for details.
>
> At least, error message come from Adobe XMP SDK which is included in
> Exiv2, not digiKam...
>
> Gilles Caulier
>
> 2014-05-22 8:52 GMT+02:00 Phil <philtuckey at free.fr>:
>> Hi Gilles
>> Unfortunately the problem cannot just be an unknown URI in some of my
>> images, because:
>> - I am simultaneously applying the same tags to many photos which have all
>> come out of the same camera, and the problem only occurs for one or two of
>> them each time;
>> - if I re-tag the same photos, the ones which had a problem the first time
>> are usually ok, but the problem appears for one or two others, which had no
>> problem the first time;
>> - also, if I take an image for which this error has just occurred and
>> rewrite the tags of only this image, it works fine.
>> So I cannot provide a specific image which provokes this error. It results
>> from the process of tagging many photos at the same time in dk.
>> I have the impression that it occurs less often in 3.5.0 than in 4.0.0. In
>> 3.5.0 I have to select about 100 photos and tag them for the problem to
>> occur regularly.
>> Best Philip
>>
>>
>>
>> On 22/05/14 07:22, Gilles Caulier wrote:
>>>
>>> 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.
>>>
>>> Best
>>>
>>> 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
>>>>> _______________________________________________
>>>>> Digikam-users mailing list
>>>>> Digikam-users at kde.org
>>>>> https://mail.kde.org/mailman/listinfo/digikam-users
>>>>
>>>>
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