You say that identify crashes, but it generates a window... is it still running or not? I suppose it is running, since I would find strange that it spawns another process just to tell you it is crashing. So, with this in mind...
Instead of using system you could fork a child process that launches identify, and use alarm in the parent.
If the child process doesn't return in a fixed amount of seconds (as far as I can understand, 10 is far more than enough), its parent could kill it and go on with next image.
Have you any experience on that?
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