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[ChrisOfBristol <2002813@xxxxxxxxxxxxxxxxxx>]

I've realised I should have tried removing the parameters one at a time to try to find which was the problem. What works is removing "-m" "Optimize field of view for all images, except for first. Useful for aligning focus stacks with slightly different magnification." I've been using this command for so long I've forgotten why -m was included and don't really understand what it does. I'll remove it and hope it doesn't cause any problems.
It's probably still a bug though as ais probably shouldn't get stuck in a loop whatever options are used.

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https://bugs.launchpad.net/bugs/2002813

Title:
  align_image_stack hangs

Status in Hugin:
  Incomplete

Bug description:
  I have an application that uses align_image_stack, which works very well.
  Unfortunately it sometimes hangs up when aligning two images, I assume that's because they are too difficult to align. It states "Number of good matches: 0, bad matches: 40" many times, then that it has done "n iterations" up to 259. At that point it states "Run called" and then gets stuck. This would be alright if I was using it from a terminal, but it's embarrassing when it does it in my app - there's no easy way to detect the condition and stop it.
  It would be better to prevent it - is that possible? If not I think it's a bug. I can supply the two  images.

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