MOS (filmmaking)

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MOS is a standard filmmaking jargon acronym used in production reports to indicate an associated film segment has no synchronous audio track.

Omitting sound recording from a particular shot can save time and relieve the film crew of certain requirements, such as remaining silent during a take, and thus MOS takes are common on contemporary film shoots, mostly when the subjects of the take are not speaking or otherwise generating useful sound.

In post-production, a MOS take may be combined with miscellaneous sounds recorded on location, the musical soundtrack, voice-overs, or sound effects created by a Foley artist.