Marko Costanzo is poised near a highly sensitive microphone, intently watching a huge television screen and using the black satin jacket he’s wearing over his otherwise casual outfit to make a very specific rustling sound. The Fort Lee resident repeatedly flicks his right hand against the inside of his left forearm to create a sound that’s not too abrasive, nor too faint — and perfectly in sync with the movements that actor Ryan Phillippe is making on screen for a film called “Shreveport.”

Costanzo is a foley artist, and George A. Lara, in a soundproof control booth to his left, is a foley mixer — terms that moviegoers who stay for the closing credits may have seen without knowing what they mean.

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