Video Terminology Glossary B:
Video, Filmmaking and Multimedia Words and Terms

B Negative – An old Film term referring to "alternate takes". These are sequences of footage shot (on film) that may or may not have been included in the film, movie.

B-Frame – The B-frame is one of the three types of frames (video data) used in the MPEG video compression scheme. The other two types are I-frames and P-frames.

B-Roll – 1. An old film editing term. Footage shot on a separate roll of film to facilitate editing. See A/B editing. 2. An old film term that is used to describe additional footage that could be used to "enhance" the primary footage (the A-roll).

Baby Boom – A lighting equipment term used to describe a small adjustable arm that can hold the microphone or a fill lamp.

Back (Rear) Projection – A cinematic technique used the film live action in front of a screen where background action is being projected.

Back Focus – A digital camera term meaning the mechanical adjustment the camera makes relative to the distance between the lens and the camera image sensor. This is especially important when using a Zoom Lens as the focus has to be maintained as the focal length changes.

Back Porch – An older term used in analog video. It's basically a few milliseconds of no signal at the end of the horizontal scan and was used to establish a reference point for the black level for that particular part of the video.

Back Timing – See: 3 Point Edit.

Backdrop – The background or visual environment the shot or movie scene takes place in. It can be artificial (props, painted or a photographic overlay) or just the natural environment (a beach, forest, prairie mountain terrain, or other landscape).

Backend – 1. (Movie business) a films profit. This can be from theater ticket sales, movie rentals or other revenue streams. 2. (Computer software) usually the part of the program that does the work (services contained within the operating system, databases etc.), as opposed to the "front end" which interacts with the user (graphical user interface etc.).

Background Artist – On the film crew, this is the person responsible for designing and constructing the art that is used as part of the movie set.

Background Generator – A television and video term. This is the device used by the engineer to add color to a black background. A lot of times it is used by the engineer to key in words on this background.

Backhaul – A term used in video broadcasting. A backhaul is sending a video feed via satellite from a local area back to the main studio for rebroadcasting.

Backlight – 1. The light that is behind a subject. 2. A lighting instrument used on movie and film sets to illuminate the subject from behind.

Bandwidth – the transmission capacity of a network or other digital communication system.

Bit – a single binary digit. It can be either a 1 or a 0 and is the smallest unit of data used in digital systems.

Blu-ray – An optical disc format. This format was developed to enable the recording and playback of high-definition video (HD). Blu-ray products use a blue violet (Hence the name Blue Ray) (405 nm) laser instead of the red laser (650nm) laser used in older equipment. The blue violet laser is able to focus the laser beam with greater precision thus allowing the data to be written more tightly so as to take up less space on the DVD/CD. (Also see: Camcorder DVD and Mini DVD Formats (Part 1) ).

Broadcast – The transmission of a program, show or production via television, radio or the Internet.

Have fun...!  Dan (Editor)

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