pyexiv2-developers team mailing list archive

[Benjamin Henne <henne@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

there was a bug in exiv2 which produced wrong XmpType in my scenario. 
There is a fix online. I now can set my xmp data using the exiv2 CLI 
(revision 2644 plus patch of issue http://dev.exiv2.org/issues/798). See 
http://dev.exiv2.org/boards/3/topics/1039#message-1060

But now I encounter a problem with pyexiv2. I am not able to set up an 
empty Bag (no value), that contains structs.

exiv2 CLI:
 exiv2 -M"set Xmp.MP.RegionInfo/MPRI:Regions ''" BabyGnuTux-Big.jpg
 exiv2 -M"set Xmp.MP.RegionInfo/MPRI:Regions[1]/MPReg:Rectangle 0.11, 
0.22, 0.33, 0.44" BabyGnuTux-Big.jpg
 exiv2 -M"set Xmp.MP.RegionInfo/MPRI:Regions[1]/MPReg:PersonDisplayName 
Baby Gnu" BabyGnuTux-Big.jpg

If I try this with pyexiv2,

 import pyexiv2
 md = pyexiv2.ImageMetadata('BabyGnuTux-Big.jpg')
 md.read()
 md['Xmp.MP.RegionInfo/MPRI:Regions'] = ['']
 md['Xmp.MP.RegionInfo/MPRI:Regions[1]/MPReg:Rectangle'] = '0.11, 0.22, 
0.33, 0.44'
 md['Xmp.MP.RegionInfo/MPRI:Regions[1]/MPReg:PersonDisplayName'] = 
'Baby Gnu'
 md.write()

I get a ValueError caused by line 4.

Traceback (most recent call last):
  File "md_examples.py", line 7, in <module>
    md.write()
  File "/usr/lib64/python2.7/site-packages/pyexiv2/metadata.py", line 
119, in write
    self._image._writeMetadata()
ValueError: Value not set

Regards,
Benjamin