User`s guide

Configuring the SGI Media Server for Control by VDCP
007-4403-003 93
• vtr.media.output.mode
• vtr.edit.coincidence.preroll
• vtr.media.video.sync_port
To guarantee frame-accurate control, the control
vtr.media.video.sync_port must be set to the name of the
SGI Media Server video port that is connected to the VTR. The application
mcpanel does this automatically, but other applications must ensure that the
control is set correctly. For example, the following entry instructs the system to
use the first serial connection defined in file control-out.conf and to use
MFCODEC_1 instead of MFCODEC_0 as the related video I/O port:
mcpanel -D dq_0 -p MFCODEC_1
If the same SGI Media Server video port is always used with the VTR, you can
set the value of vtr.media.video.sync_port to the name of the video port
in the appropriate dq_port device defaults file. However, if the controlled VTR
might be connected to different SGI Media Server video ports at different times,
set the control using the MVCP SET command. For example, before performing
a frame-accurate capture from the controlled VTR to the MFCODEC_2 video
port, set the following control:
SET dq-unit-name MED vtr.media.video.sync_port MFCODEC_2
For information on the controls, see the vst-controls(5) man page.
5. Put the VTR into remote (or slave) mode.
6. Repeat all these steps for as many VTRs as you wish to control and as are connected
to the SGI Media Server.
Configuring the SGI Media Server for Control by VDCP
The Video Disk Communications Protocol (VDCP) provides full-featured control of the
SGI Media Server using an RS-422 or TCP/IP connection. The Harris Automation
ADC100 controller is such a controller. Connected to the SGI Media Server, a VDCP
processor supports the following:
• Back-to-back play and record (subject to restrictions imposed by the video I/O port
capabilities)
• Control of multiple video (signal) ports from a single communications (control) port