Issues when creating a XMP sidecar file from zero

[mateusfmcota]

Hi, I'm having an issue when I'm trying to create an XMP sidecar file from scratch with xmp toolkit

I tried to do something like this

        xmpfile = XMPFiles( file_path=xmpFilename, open_forupdate=True)
        xmp = xmpfile.get_xmp()
        
        xmp.set_property(consts.XMP_NS_DC, u'creator', post['source'])

but it throws this error:
AttributeError: 'NoneType' object has no attribute 'set_property'

Can anyone help me?

[zougloub]

Hi @mateusfmcota, and happy 2024, I could reproduce your issue (it would have been better if you provided a self-contained example as well as a traceback).

I get a segfault when running the equivalent exempi command-line:

exempi -w test.xmp -s dc:creator -v me

So it looks like an upstream issue.

[zougloub]

(segfault issue had been reported here: https://gitlab.freedesktop.org/libopenraw/exempi/-/issues/31)

[zougloub]

The segfault has been fixed, but in the same way that it's possible to write a sidecar file using exiftool with eg.:

exiftool -creator=me test.xmp

One would expect exempi to support the analogous:

exempi -w test.xmp -s dc:creator -v me

But it currently doesn't work, as the exempi CLI attempts to read the file.

I haven't checked whether this a limitation of the Adobe SDK or exempi, yet.