Arithmetics in FMT

[Plywood]

Hi,
I'm trying to export kml from MP4 video and I want the <name> tag to include an increasing number for each placemark extracted.
I have successfully defined a user parameter called Counter using:

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exiftool -userparam Counter#=1
and used it in my custom FMT

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#[BODY]        <name>$main:directory;$_=self-GetValue('Counter)}</name>
But I can't find a way to increment it between every extracted coordinate

All outputs in the generated kml are <name>1</name>

[Phil Harvey]

You can ause a trick like this in the format file:

#[BODY]        <name>${main:directory;$_=++$Image::ExifTool::myCounter}</name>

Here I have defined a "myCounter" variable in the Image::ExifTool namespace so it maintains its value between usages.

- Phil

[Plywood]

Thank you Phil!