User`s guide

6 007-4403-003

1: Overview of the SGI Media Server

The following control interface modules are provided:

• The Video Disk Communications Protocol (VDCP). This control protocol provides

control of VST over RS-422. The VDCP interface module supports back-to-back play

and record (subject to restrictions imposed by the video I/O port capabilities).

• The Sony RS-422 VTR (also called, 9-pin or P2) protocol. VST supports this protocol

through a full-featured VTR deck-emulation mode that includes frame-accurate

insert editing and a variable-speed shuttle.

• Multiport Video Computer Protocol (MVCP) deﬁned by SGI. This control protocol

provides full-featured control of VST through TCP/IP. This control interface

module supports archive management, multiple-unit control, and event monitoring

and provides access to advanced features of SGI devices.

Storage Device Interface Module

Storage device interface modules provide access to the storage systems on which the clip

cache resides. Currently, there is a storage device interface module for the IRIX XFS

ﬁlesystem.

Media Device Interface Module

Media device interface modules provide access to the ports over which the media is

played and recorded (that is, the media ports). Each type of I/O port typically has its own

media device interface module.

VST has media device interface modules for the following:

• PCI-VIDAUD-MSB-B is the DVCPRO 25, DVCPRO 50, DVCAM, and MPEG-2

multiformat video and audio codec for PCI backplanes.

• PCI-VIDAUD-MSB-C is the DVCPRO 25, DVCAM, DV (16-bit/48 Khz only), and

MPEG-2 multiformat video and audio codec for PCI backplanes.

• PCI-VIDAUD-MSB-IMX is the DVCPRO 25, DVCPRO 50, DVCAM, IMX, and

MPEG-2 multiformat video and audio codec for PCI backplanes.

• PCI-VIDAUD-MSB-IMX-C is the DVCPRO 25, DVCPRO 50, DVCAM, DV (16-

bit/48 Khz only) , D10/IMX, and MPEG-2 multiformat video and audio codec for

PCI backplanes.

• Diaquest (limited support): direct Sony RS-422 control of videotape decks.