different between footage vs sepmag

English

foot (unit of length) +? -age

footage (countable and uncountable, plural footages)

(usually uncountable) An amount of film or tape that has been used to record something.
The footage we shot at the riot yesterday got ruined.
A measurement in feet.

Clipping of separate magnetic (“from the magnetic tape used for recording”).

sepmag (not comparable)

(television, dated) Having a separately recorded soundtrack running concurrently with the film footage.
- 1970, BBC Engineering (issues 81-88, page 13)
  Sound for these two telecines is reproduced from conventional sepmag tape machines.

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