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Video Recording Terminology


Audio/Visual Script A dual column screenplay with video description on the left and audio and dialogue on the right, used in advertising, corporate videos, documentaries and training films.

Double-System Sound Sound and picture on separate transports. This refers to the normal methodology of recording the picture on a camera while recording sound of a separate magnetic tape recorder. (Film)

Edit Decision List (EDL) The list of SMPTE codes, in footage and frames, and including instructions for fades, dissolves and other special effects which corresponds to all the segments that the editor of a film or videotape production has decided to use in the final cut. Used mostly in the old days of linear editing. Editing from offline to online editing.

Sync Beep (sync tone) In double system shooting with video cameras, an audio tone is fed into an audio recorder at the same time that the sound is picked up on the camera microphone. The beep from the camera mic is later aligned with the beep tone from the audio recorder to achieve synchronization of the sound to the picture.

Time Base Signal A signal recorded on the edge of film in a camera to match a signal recorded on a magnetic recording which is used as a fast means of synchronizing film and sound workprints.

Time Code A coded signal generated by a camera or separate device giving information about such things as frame number or time of recording. This information can be used in post production to log the shots, organize the video clips, etc.

This glossary defines terms that are used in the document "Defining Video Quality Requirements: A Guide for Public Safety", developed by the Video Quality in Public Safety (VQIPS) Working Group. It contains terminology and explanations of concepts relevant to the video industry. The purpose of the glossary is to inform the reader of commonly used vocabulary terms in the video domain. This glossary was compiled from various industry sources.

Shot: All video is made up of shots.A shot is basically from when you press record to when you stop recording. Like theindividual photos which make up an album, the shots get put together to make a video.

Analog recording A recording in which continuous magnetic signals are written to the tape that are representations of the voltage signals coming from the recording of the video camera or microphone. Analog signals stored on tape deteriorate with each copy or generation; in contrast see digital.

Analog video A system of recording video images that employs continuously varying waveforms to encode brightness, color and the timing information necessary to reproduce a moving image.

Archival format A video format that provides reliable playback, without information loss. The format should be a current (as opposed to obsolescent) professional one supported by the industry. At present archival video material is typically stored on magnetic tape however in the near future computer-based storage is likely to become an option for archives. The advantage of uncompressed digital formats over analog formats is that they can be copied without generational loss. For this reason many archives are using digital formats for creating their archival masters. Ideally these formats should be uncompressed, component formats; however, for practical and cost reasons for Suitable archival formats will change as older formats become obsolete and are no longer supported. Ideally, archival master material is transferred onto new stock every 5-7 years and at this point a decision should be made about whether it is necessary to move to a new format as well. An archival format is therefore one that can be migrated onto new stock and new formats without the loss or distortion of information.

Artifact An undesirable picture element in a video image, which may naturally occur in the recording process and must be eliminated in order to achieve a high quality image. Most common artifacts are cross-color and cross-luminance. Not to be confus


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