Cinemetrics is a promising example of Identicon IMO. Similar efforts have been made audio clips.

Cinemetrics aims to create a visual “fingerprint” for film using the editing structure, color, speech and motion.

Design challenge in generating interesting ‘fingerprint’ depends largely on the target audience. Multimedia production is a very iterative process resulting in many variations and combinations so, if the target audience are film editors, challenge is in finding ways to emphasize difference without sacrificing similarity.