I\'m having difficulties filling in a form using pdftk
with text fields with true type fonts.
This was causing a huge headache for me for 2 days. It turns out I was focusing on the wrong end of the problem.
A nice alternative that isn't as manual and only has to be done once is to enter some text in a field of the source PDF form, in your case ./my_form.pdf. I don't know EXACTLY why this works, but it does. that way if you want to create a new file at any time, you dont have to go through this trouble :)