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For other uses, see Timecode (disambiguation).

A timecode (alternatively, time code) is a sequence of numeric codes generated at regular intervals by a timing synchronization system. Timecode is used in video production, show control and other applications that require temporal coordination or logging of recording or actions.

Video and film

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In video production and filmmaking, SMPTE timecode is used extensively for synchronization, and for logging and identifying material in recorded media. During filmmaking or video production shoots, the camera assistant will typically log the start and end timecodes of shots, and the data generated will be sent on to the editorial department for use in referencing those shots. This shot-logging process was traditionally done by hand using pen and paper, but is now typically done using shot-logging software running on a laptop computer that is connected to the timecode generator or the camera itself.

The SMPTE family of timecodes are almost universally used in film, video and audio production, and can be encoded in many different formats, including:

Keykode, while not a timecode, is used to identify specific film frames in film post-production that uses physical film stock. Keykode data is normally used in conjunction with SMPTE timecode.

Rewritable consumer timecode is a proprietary consumer video timecode system that is not frame-accurate and is therefore not used in professional post-production.

Other formats

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Timecodes for purposes other than video and audio production include:

  • IRIG timecode is used for military, government and commercial purposes.
  • DTS timecode is used to synchronise the optical DTS timecode track from a projector to the CD-based DTS audio tracks.

Timecode generators

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Timecode reader/generator with character inserter

Depending on the environment, timecode generators can take various forms.

See also

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References

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  • John Ratcliff (1999). Timecode: A user's guide, second edition (Thirdย ed.). Focal Press. ISBNย 978-0-240-51539-7.
  • Charles Poynton (1996). A Technical Introduction to Digital Video. John Wiley & Sons. ISBNย 0-471-12253-X.

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SMPTE timecode

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worth of timecode in a single message, are used to locate to a time while timecode is not running. Unlike standard SMPTE timecode, MIDI timecode's quarter-frame

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Timecode (disambiguation)

Look up timecode in Wiktionary, the free dictionary. Timecode may refer to: Timecode, a sequence of numeric codes generated at regular time intervals Timecode

IRIG timecode

Inter-range instrumentation group timecodes, commonly known as IRIG timecode, are standard formats for transferring timing information. Atomic frequency

Linear timecode

Linear (or Longitudinal) Timecode (LTC) is an encoding of SMPTE timecode data in an audio signal, as defined in SMPTE 12M specification. The audio signal

Control track longitudinal timecode

longitudinal timecode, or CTL timecode, developed by JVC in the early 1990s, is a unique technique for embedding, or striping, reference SMPTE timecode onto a

AES3

channel status word, as might be caused by switching mid-block. SMPTE timecode data can be embedded within AES3 signals. It can be used for synchronization