Burnt-in timecode

Burnt-in timecode (often abbreviated to BITC by analogy to VITC) is a human-readable on-screen version of the timecode information for a piece of material superimposed on a video image. BITC is sometimes used in conjunction with "real" machine-readable timecode, but more often used in copies of original material on to a non-broadcast format such as VHS, so that the VHS copies can be traced back to their master tape and the original time codes easily located.

Many professional VTRs can "burn" (overlay) the tape timecode onto one of their composite outputs. This output (which usually also displays the setup menu or on-screen display) is known as the "super out" or "monitor out". The "character" switch or menu item turns this behaviour on or off. The "character" function is also used to display the timecode on the preview monitors in linear editing suites.

Videotapes that are recorded with timecode numbers overlaid on the video are referred to as "window dubs", named after the "window" that displays the burnt-in timecode on-screen.

Timecode can also be superimposed on video using a dedicated overlay device, often called a "window dub inserter". This inputs a video signal and its separate timecode audio signal, reads the timecode, superimposes the timecode display over the video, and outputs the combined display (usually via composite), all in real time. Stand-alone timecode generator / readers often have the window dub function built-in.

Some consumer cameras, in particular DV cameras, can "burn" (overlay) the tape timecode onto the composite output. This output typically is semi-transparent and may include other tape information. It is usually activated by turning on the 'display' info in one of the camera's sub-menus. While not as 'professional' as an overlay as created by a professional VCRs, it is a cheap alternative that is just as accurate.

Timecode is stored in the metadata areas of captured DV AVI files, and some software is able to "burn" (overlay) this into the video frames. For example, DVMP Pro [ [http://www.dvmp.co.uk/dv-media-player-pro.htm DVMP Pro] - Software for burning in timecode and other items of metadata for DV AVI files.] is able to "burn" timecode or other items of DV metadata (such as date and time, iris, shutter speed, gain, white balance mode etc) into DV AVI files.

Some modern editing systems can use OCR techniques to read BITC in situations where other forms of timecode are not available.

ee also

*Linear timecode
*Vertical interval timecode
*SMPTE time code
*MIDI timecode
*CTL timecode
*AES-EBU embedded timecode
*Rewritable consumer timecode

References


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Look at other dictionaries:

  • Burnt-in timecode (BITC) — PP Footage with timecode permanently displayed on the image ( burnt in ). This can be used during offline editing to correctly match shots for theonline edit …   Audio and video glossary

  • Timecode (indicateur) — Timecode (temporel) Mire de barre et Timecode incrusté Le Timecode a été développé à l origine pour la télévision à l époque du noir et blanc. Ce qui explique ses limites. le TC est une forme de metadata. Le time code est une référence temporelle …   Wikipédia en Français

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  • MIDI timecode — MIDI time code (MTC) embeds the same timing information as standard SMPTE time code as a series of small quarter frame MIDI messages. There is no provision for the user bits in the standard MIDI time code messages, and SysEx messages are used to… …   Wikipedia

  • Vertical interval timecode — (VITC, pronounced vitsee ) is a form of SMPTE timecode embedded as a pair of black and white bars in a video signal. These lines are typically inserted into the vertical blanking interval of the video signal. There can be more than one VITC pair… …   Wikipedia

  • Time-code (indicateur) — Timecode (temporel) Mire de barre et Timecode incrusté Le Timecode a été développé à l origine pour la télévision à l époque du noir et blanc. Ce qui explique ses limites. le TC est une forme de metadata. Le time code est une référence temporelle …   Wikipédia en Français

  • SMPTE time code — SMPTE timecode is a set of cooperating standards to label individual frames of video or film with a timecode defined by the Society of Motion Picture and Television Engineers in the SMPTE 12M specification. Timecodes are added to film, video or… …   Wikipedia

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