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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.
There are many theories regarding the source of the abbreviation "MOS". [1]
When sound recording reached the point where the sound was recorded on a synchronized but separate piece of media (such as 35mm film, audio tape, or other media), a method of keeping the recording media and camera film "in sync" was needed. The solution was to use a special form of motor which has multiple "windings" in it, and which can be connected to another identical motor in such a way that turning one motor a certain distance will turn the other motor exactly the same distance. The motors did not have to be close together, and, with appropriate circuitry, did not have to be of the same size or power. These motors were called selsyn (self synchronous) motors. A system was created by which a single sound recording room could be connected to any of the stages on a studio lot (such connection points are still visible on some of the oldest stages). The production sound mixer on stage connected the control panel to the recording room and the camera. There was a selsyn motor on the camera and it was linked to a matching selsyn motor on the sound recording equipment at another point on the studio lot.
In order to use this system, the sound mixer used an intercom to the sound recordist to tell him to "roll", or start the system. Since this was a mechanical system, it took some time to start the motors and get them up to proper speed. When proper speed and synchronization was reached, the recordist would use the intercom to announce, "Speed" and the sound mixer would relay that to the director and crew on the stage. The expression is still used, but now simply means, "Sound is recording".
It was the recordist who started and stopped the camera motor. The camera operator had a switch to ensure that the camera did not roll at an inopportune time such as loading, replacing lenses, etc. It was also the recordist's duty to stop the motor if something went amiss. The actual power source for the camera motor was in the sound booth. [2] [3]
When a shot was planned that did not require sound, the sound mixer would ask the recordist to "roll the motor only". The recordist would start the camera motor without starting the matching "sound" motor and electronics. The procedure, allegedly, acquired the name "motor only shot", which became the basis of the acronym MOS.
A popular origin theory is that MOS stands for broken English "mit ohne sound", that is, "without sound" as a 1920s German-émigré director might have said it.
According to this theory, a German director, recently transplanted to Hollywood (probably Ernst Lubitsch, but possibly Fritz Lang), was asked by a script supervisor how he would like to shoot the next scene of the day. The director apparently responded "mit ohne sprechen!" which translates to "without speaking", and so this was noted as a joke on the production reports and the camera slates for the shot. While this is a commonly recounted story about the origin of the term, it is unlikely to be true. Because "ohne" means "without" in German, it is highly unlikely that any native German speaker would ever say "mit ohne" in this context.
In The Screenwriter's Bible, author David Trottier credits the term to Austrian director Erich von Stroheim, who allegedly would tell his crew "Ve'll shoot dis mid out sound." [4]
Other explanations for the meaning of the initials have appeared over the years in books, articles, publications, journals, and web pages: [1]
The terms "MOS," "motor only shot," "mit out sound," or any of their versions, DO NOT occur in the following works:
Additionally, the term(s) do not occur in any book published in the United Kingdom[ citation needed ] on motion picture production or post-production methods and procedures.
35 mm film is a film gauge used in filmmaking, and the film standard. In motion pictures that record on film, 35 mm is the most commonly used gauge. The name of the gauge is not a direct measurement, and refers to the nominal width of the 35 mm format photographic film, which consists of strips 1.377 ± 0.001 inches (34.976 ± 0.025 mm) wide. The standard image exposure length on 35 mm for movies is four perforations per frame along both edges, which results in 16 frames per foot of film.
A production sound mixer, location sound recordist, location sound engineer, or simply sound mixer is the member of a film crew or television crew responsible for recording all sound recording on set during the filmmaking or television production using professional audio equipment, for later inclusion in the finished product, or for reference to be used by the sound designer, sound effects editors, or Foley artists. This requires choice and deployment of microphones, choice of recording media, and mixing of audio signals in real time.
Cinematography is the art of motion picture photography.
A movie camera is a type of photographic camera that rapidly takes a sequence of photographs, either onto film stock or an image sensor, in order to produce a moving image to display on a screen. In contrast to the still camera, which captures a single image at a time, the movie camera takes a series of images by way of an intermittent mechanism or by electronic means; each image is a frame of film or video. The frames are projected through a movie projector or a video projector at a specific frame rate to show the moving picture. When projected at a high enough frame rate, the persistence of vision allows the eyes and brain of the viewer to merge the separate frames into a continuous moving picture.
CinemaScope is an anamorphic lens series used, from 1953 to 1967, and less often later, for shooting widescreen films that, crucially, could be screened in theatres using existing equipment, albeit with a lens adapter.
A sound editor is a creative professional responsible for selecting and assembling sound recordings in preparation for the final sound mixing or mastering of a television program, motion picture, video game, or any production involving recorded or synthetic sound. The sound editor works with the supervising sound editor. The supervising sound editor often assigns scenes and reels the sound editor based on the editor's strengths and area of expertise. Sound editing developed out of the need to fix the incomplete, undramatic, or technically inferior sound recordings of early talkies, and over the decades has become a respected filmmaking craft, with sound editors implementing the aesthetic goals of motion picture sound design.
Vitaphone was a sound film system used for feature films and nearly 1,000 short subjects made by Warner Bros. and its sister studio First National from 1926 to 1931. Vitaphone is the last major analog sound-on-disc system and the only one that was widely used and commercially successful. The soundtrack is not printed on the film, but issued separately on phonograph records. The discs, recorded at 33+1⁄3 rpm and typically 16 inches (41 cm) in diameter, are played on a turntable physically coupled to the projector motor while the film is projected. Its frequency response is 4300 Hz. Many early talkies, such as The Jazz Singer (1927), used the Vitaphone system. The name "Vitaphone" derived from the Latin and Greek words, respectively, for "living" and "sound".
Sync sound refers to sound recorded at the time of the filming of movies. It has been widely used in movies since the birth of sound movies.
Panavision is an American motion picture equipment company founded in 1954 specializing in cameras and lenses, based in Woodland Hills, California. Formed by Robert Gottschalk as a small partnership to create anamorphic projection lenses during the widescreen boom in the 1950s, Panavision expanded its product lines to meet the demands of modern filmmakers. The company introduced its first products in 1954. Originally a provider of CinemaScope accessories, the company's line of anamorphic widescreen lenses soon became the industry leader. In 1972, Panavision helped revolutionize filmmaking with the lightweight Panaflex 35 mm movie camera. The company has introduced other cameras such as the Millennium XL (1999) and the digital video Genesis (2004).
Digital cinematography is the process of capturing (recording) a motion picture using digital image sensors rather than through film stock. As digital technology has improved in recent years, this practice has become dominant. Since the mid-2010s, most movies across the world are captured as well as distributed digitally.
The Movietone sound system is an optical sound-on-film method of recording sound for motion pictures that guarantees synchronization between sound and picture. It achieves this by recording the sound as a variable-density optical track on the same strip of film that records the pictures. The initial version was capable of a frequency response of 8500 Hz. Although modern sound films use variable-area tracks instead, modern motion picture theaters can play a Movietone film without modification to the projector. Movietone was one of four motion picture sound systems under development in the U.S. during the 1920s, the others being DeForest Phonofilm, Warner Brothers' Vitaphone, and RCA Photophone, though Phonofilm was principally an early version of Movietone.
Mitchell Camera Corporation was an American motion picture camera manufacturing company established in Los Angeles in 1919. It was a primary supplier of newsreel and movie cameras for decades, until its closure in 1979.
Eclair, formerly Laboratoires Eclair, was a film production, film laboratory, and movie camera manufacturing company established in Épinay-sur-Seine, France by Charles Jourjon in 1907. What remains of the business is a unit of Ymagis Group offering creative and distribution services for the motion pictures industries across Europe and North America such as editing, color grading, restoration, digital and theatrical delivery, versioning.
RCA Photophone was the trade name given to one of four major competing technologies that emerged in the American film industry in the late 1920s for synchronizing electrically recorded audio to a motion picture image. RCA Photophone was an optical sound, "variable-area" film exposure system, in which the modulated area (width) corresponded to the waveform of the audio signal. The three other major technologies were the Warner Bros. Vitaphone sound-on-disc system, as well as two "variable-density" sound-on-film systems, Lee De Forest's Phonofilm, and Fox-Case's Movietone.
Linwood G. Dunn, A.S.C. was an American pioneer of visual special effects in motion pictures and an inventor of related technology. Dunn worked on many films and television series, including the original 1933 King Kong (1933), Citizen Kane (1941), and Star Trek (1966–69).
Optical sound is a means of storing sound recordings on transparent film. Originally developed for military purposes, the technology first saw widespread use in the 1920s as a sound-on-film format for motion pictures. Optical sound eventually superseded all other sound film technologies until the advent of digital sound became the standard in cinema projection booths. Optical sound has also been used for multitrack recording and for creating effects in some musical synthesizers.
Auricon cameras were 16 mm film Single System sound-on-film motion picture cameras manufactured in the 1940s through the early 1980s. Auricon cameras are notable because they record sound directly onto an optical or magnetic track on the same film as the image is photographed on, thus eliminating the need for a separate audio recorder. The camera preceded ENG video cameras as the main AV tool of television news gathering due to its portability–and relatively quick production turn-around–where processed negative film image could be broadcast by electronically creating a positive image. Additionally, the Auricon found studio use as a 'kinescope' camera of live video off of a TV screen, but only on early pre-NTSC line-locked monochrome systems.
Articles related to the field of motion pictures include:
A sound follower, also referred to as separate magnetic, sepmag, magnetic film recorder, or mag dubber, is a device for the recording and playback of film sound that is recorded on magnetic film. This device is locked or synchronized with the motion picture film containing the picture. It operates like an analog reel-to-reel audio tape recording, but using film, not magnetic tape. The unit can be switched from manual control to sync control, where it will follow the film with picture.
Minus optical signal, Minus optical sound, Minus optical stripe, Muted on screen, Mute on sound, Mic off stage, Music on side, Motor only shot, Motor only sync