Let me show you exactly what I am seeing. I agree, we're talking around in circles. /Image-ExifTool-10.00/exiftool -args foo.jpg | grep GPS Start with a file with no GPS tags (you'll have to mangle the commands if you aren't Linux) GStreamer has separate code to handle the two types of tag I have to enhance the readers and writers for both types, and obviously to test this I want files with differing values. It wouldn't make much sense for them to be different - but what I'm trying to do is test my enhancements to support these particular tags in GStreamer.

AIUI both the tag based and the XML based properties can be written into the file, and they have independent values. That lists the tags 7 and 1d, and states that they both map down to the XML property exif:GPSTimeStamp. In CIPA DC-010 -2012 Exif 2.3 metadata for XMP there's a table showing the mapping between tag based and XML properties. I am missing something? Test file is here: test.I don't think I'm confused - but I might be ) in fact this whole area is pretty confusing. Reading the field works: exiftool -PropertyId /Users/user/test.jpgīut when trying to write a value for PropertyId tag, does not work.I did try also to use -xmp:PropertyId but I get the same result: exiftool -PropertyId=12345 /Users/user/test.jpgĮxporting the metadata shows that the field is there: (I only copied the xmp section) exiftool -xmp -b -a /Users/user/test.jpg > data.xmp I am trying to write a new value for a XMP tag using exiftool but for some reason the tag is not being recognized.

Exiftool show all tags