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Interesting. The problem is that you want to copy the values
from two separate files into a single tag. Tricky.
You have come across a limitation of the exiftool application.
Of course, this is easy to do via the API, but not via the
application.
If you are in Unix, you could do it with a command line like this:
exiftool a.jpg '-caption-abstract<$caption-abstract | '`exiftool b.jpg -caption-abstract -b`
But I don't know a way to do this in Windows.
You could also do it by going through a temporary file. This should work
in any O/S:
exiftool a.jpg -caption-abstract -b > tmp.txt
echo " | " >> tmp.txt
exiftool b.jpg -caption-abstract -b >> tmp.txt
exiftool a.jpg "-caption-abstract<=tmp.txt"
A bit messy too, but at least it is cross-platform. Of course, you
could automate it somewhat by using a script or batch file.
Unfortunately, both of these techniques only process one file at a
time, so batch processing must be scripted too.
Sorry I don't have a perfect solution, but I hope this helps.
- Phil
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