The Sony protocol for communicating with video devices. 9-Pin is the same as RS-422.


The Alesis ADAT Optical I/O interface is an 8-channel, 24-bit digital audio interface. It is important to distinguish between the ADAT Optical format, a 24-bit digital audio I/O protocol, and the ADAT tape decks themselves. SGI workstations support the ADAT Optical interface, in addition to AES digital I/O, either built in or via a low-cost option card.


(Audio Engineering Society) AES Stereo Digital Audio Input/Output. This connection provides a stream of digital audio data that complies with the AES Digital Audio format.

archive system

A repository for storing and distributing digital media data. A StudioCentral 2.0 archive system is one that a Video Server Toolkit has been configured to use. Video Server Toolkit can store clips in, and retrieve them from, a StudioCentral 2.0 archive system only.


Unit of storage in a StudioCentral 2.0 archive system. Each asset consists of descriptive information such as the title and duration; digital media data, if the asset has content; and an index, if required by the content format. For example, each movie, commercial, trailer, thumbnail, and so on, stored in a StudioCentral 2.0 archive system is an asset. Assets may consist of only descriptive information if those assets are used to group other assets.

automation controller

Computers that control broadcast devices. Automation controllers provide features such as playing and recording clips according to a predefined schedule, providing statistics about actual events, previewing schedules, controlling broadcast equipment, and so on.


MediaHub Asset Transfer Service. The Asset Transfer Service daemon (atsd) can be used to access the meta data and media contents of the Groups and Atoms contained in a MediaHub server without using the full DAS or StudioCentral API's.

Automation Systems

Broadcast Automation Systems (such as the Louth ADC- series) are used extensively by broadcast studios to control multiple video devices. Scheduling of video playback and recording, in conjunction with pre-assigned switcher effects can all be scheduled through a single interface.

CCIR 601

A digital coding standard for television that is applicable to both the NTSC as well as PAL/SECAM technologies. The standard describes the encoding parameters for the 4:2:2 member of the family (where 4:2:2 is the ratio in which the luminance and chrominance sampling frequencies are related). One CCIR 601 video stream (no alpha) is about 22 MB/sec.


The unit of storage in Video Server Toolkit. Each clip consists of descriptive information such as the title and duration; digital media data, if the clip has content; and an index, if required by the content format.

clip cache

XFS filesystems in which Video Server Toolkit stores clips. The clip cache can reside on a normal XFS filesystem that can be shared with other uses, or a real-time filesystem created on a set of striped disks or RAID units.

cue point

Timecodes that are used to move around within a clip and to control the portion of the clip that is played. An in-point, the duration, and an out-point are each specified using the hh:mm:ss:ff hh is the hours, mm is the minutes, ss is the seconds, and ff is the frame number. In drop-frame mode, the final colon is replaced by a period (hh:mm:ss.ff).

For example, if a clip with a cue in-point of 00:00:30.00 is cued for playing in the forward direction, it is cued at 30 seconds.


MediaHub Digital Asset Store.


Deck control software made by DiaQuest.


The compression format used by DVCPRO. A DIF file, for example, is a file containing a clip compressed by DVCPRO.


Digital Video Option, available on Origin servers. DIVO provides digital video ports through which digital media data is played and recorded by Video Server Toolkit.


A DIVO board altered to work specifically with DVCPRO products.


Digital Media data transport subsystem. DMBuffers are used for sharing and exchanging time-sensitive visual data between compression devices and algorithms, video input/output, graphics rendering and texturing, and the host processor(s).


Dynamic shared object. An object that one program can share with another.


A digital video compression format provided by Panasonic. The format provides 4:1 video compression.

edit point

Persistent timecode values that are stored with a clip. Edit points are used to automatically initialize the cue points when the clip is loaded. An in-point, the duration, and an out-point can each be specified using the hh:mm:ss:ff format, where hh is the hours, mm is the minutes, ss is the seconds, and ff is the frame number. In drop-frame mode, the final colon is replaced by a period (hh:mm:ss.ff).

For example, if a clip has an edit in-point of 00:00:30.00, its cue in-point is initialized to 30 seconds when the clip is loaded.

Edit points may also be called “edit marks.”

Fibre Channel

The Fibre Channel Standard defines a high-speed data transfer interface that can be used to connect workstations, mainframes, supercomputers, storage devices and displays. The standard addresses the need for very fast transfers of large volumes of information. Typical high-end Fibre Channel devices carry up to 1 Gb/s data rates.


Guaranteed Rate I/O. GRIO is included in IRIX and is used by Video Server Toolkit to guarantee disk bandwidth for recording and playback while allowing non-priority access to the clip cache for other operations.


A company that makes, among other components, time code readers. Its identifier in configuration files is hsip.


See Horita.

Little Red

A time code reader made by Miranda. Its identifier in configuration files is littlered.

Lossless Coding

A two-to-one compression format that does not reduce picture quality. It is a DIVO-601 internal format. See also, Rice.


The Louth Video Disk Communications Protocol, defined by Louth Automation, provides full-featured control of the Video Server Toolkit using RS-232, RS-422, and TCP/IP.


VTR emulation application for Video Server Toolkit.


An application used for browsing/streaming MPEG-1, MPEG-2 (and lower bit rate formats) over intranets, streaming Server on SGI workstations, and browsing clients on all platforms. It is compatible as browsing application for MediaHub and StudioCentral.


Archive component of the VCP. MediaHub is built upon StudioCentral and allows assets to be shared between Video Server Toolkit and other VCP software.

media port

Refers to any port through which digital media or control data is passed. That is, the term refers to either a video or a deck control port. See also, port.


Motion-JPEG (Joint Photographic Experts Group). Video Compression technology based upon DCT.


MediaHub Migration Manager. The Migration Manager is an Orbix service that performs Hub-to-Hub transfers and Hub deletes of DAS assets.


Broadcast satellite industry standard format for compressed video (1 to 15 MB/sec at 4:2:0). 4:2:2 (Studio Profile) format is from 8 to 40 MB/sec.


Multiple-Unit Video Computer Protocol. A protocol defined by SGI that provides full-featured control of Video Server Toolkit through TCP/IP.


Multi-port Video Processor for the Silicon Graphics O2 system. The MVP driver supports the O2 video input and output as well as the screen capture devices. It was designed and written to the device-dependent specification of the Video Library (VL) replacement for O2 workstation, DVL (Direct Video Library, that is, no video daemon).


The Odetics protocol is a video disk control protocol similar in purpose to the Louth board, which gives Video Server Toolkit control over Odetics devices.


P2 is the Panasonic name for the Sony protocol.


A point at which an external device connects to Video Server Toolkit. Video Server Toolkit defines the following types of ports:

  • Video ports, used by video input and output devices. DIVO video ports are named DIVO_n (for example, DIVO_2), the O2 workstation video port is named mvp, and Vela decoder ports are named vela_n (for example, vela_2).

  • Deck control ports, which are used by V-LAN transmitters. Deck control ports are named vlan_”n” (for example, vlan_0).

The term media port refers to either a video or a deck control port.


During recording, both source and recording machines can be rewound, generally three frames, so that the beginning of the recording starts when both machines are running at the correct speed. As a result, edits are more frame-accurate.


A lossless bit reduction (compression) encoding scheme that is supported on the Silicon Graphics DIVO video option.


Is the Sony protocol for communicating with video devices.


A broadcast digital video signal standard. All high end digital video formats as well as many peripheral devices have adopted this standard. 259M is a universal standard permitting long cable runs regardless of the size of the facility.


A media company that uses it's protocol, a standard by default, to control media machines, such as VTRs.


Is a software development environment for building applications and tools for digital asset management solutions. StudioCentral provides the foundation for the acquisition, creation, production, and distribution of digital assets.


A software mechanism that functions like a logical video tape recorder transport and is capable of loading, cueing, playing, and recording digital clips. The unit manages a media port, which may be shared with another unit.

A unit may also called a logical unit.

Video Server Toolkit

Video Server Toolkit is an element of the Origin Video Computing Platform from SGI. Video Server Toolkit is the clip serving platform element of VCP. The core Video Server Toolkit software provides management of a simple database of clips (the Clip Cache), a control API for managing and operating the Video Server Toolkit, and a core library which supports various External Interface Modules.


Video Disk Control Protocol. RS-422 based protocol used by the Louth Automation ADC series.VDCP is the basis for control protocols for other manufacturers (such as Alamar), as well. Video Server Toolkit can parse VDCP through serial ports or TCP/IP sockets.

Vela Research

Manufacturers of MPEG-2 Hardware & Software. Their Quad-SCSI decoder is supported by Video Server Toolkit on the SGI platform.


A multi-channel digital broadcast play out application that runs on SGI servers. It is designed to play out more than 100 channels of stored MPEG-2 compressed digital video, audio, and data over ATM.


Variable-frame optimized audio/video file format. As the name implies, it is frame-, rather than stream-oriented, and has an separate index file associated with each media file. This is the format used by Video Server Toolkit for all 601 (including lossless coded) streams played out via DIVO-601, as well as M-JPEG on the O2 workstation.

Video Computing Platform

A software platform enabling developers to construct high-performance, scalable video and audio applications on SGI systems.


Video Local Area Network. A VLAN network allows a computer application to control and synchronize all connected VTRs, switchers, DATs, mixers and DVEs.


A videotape recorder, which is a device that records and plays videotapes.


Video Server Toolkit server. The Video Server Toolkit server is the main executable of the Video Server Toolkit platform software.