Footage
A term that is in use when it comes to videos is a term that comes from more that 100 years ago
In 1880, George Eastman began manufacturing gelatin dry photogenic plates. He then produced nitrocellulose-based film, the first transparent and flexible film. This had inherent advantages such as easy transportation and durability.
In 1893, Thomas Edison showcased the kinetoscope, which we today call the projector. By 1896, it had become the standard, and so had the 35 mm size.
As movie recordings became common, they were all recorded in 35 mm films. The 35 mm film would record 24 images per second and 16 images per foot. A one-minute video would be 90 feet long.
When the video had to be edited, the editors measured their edits in feet, and hence the term footage became the norm.
We use the same term event today, although all video is digitally recorded and no longer on video. A snippet of video has become - footage.