calculating the square 'footage' of the room [=calculating the size of the room in square feet]
Some disturbing 'footage' of the war was shown on the evening news.
(..) This is Bill Herron from our West Coast Special Programs Department. George Bosch. Barbara Schlesinger. Tommy Pellegrino. l just saw footage of a special Bill's doing on the revolutionary underground. Most of it's tedious stuff of Laureen Hobbs and two fatigue jackets... but he's got eight minutes (..)1976 Network
(..) switch him to projection room . - l'm sorry, Bill. This Beale business. - lt's all right. Sit down. Diana asked if she could sit in on this. Fine. How's it going? You'll like this footage better than the stuff l showed you last time. Max Schumacher. Goddamn it! When? Did he say anything? (..)1976 Network