User`s guide

98 007-4403-003
7: Configuring and Using External Devices
pathname prefix field permits you to specify an arbitrary and relative (relative to
/usr/vtr/clips) prefix for the clip path.
As shown in Example 7-1, ports 7 and 8, corresponding to MFCODEC_0 and MFCODEC_1,
will have their ingested clip content placed in directories /usr/vtr/clips/path1 and
/usr/vtr/clips/path2, respectively. MFCODEC_2 and MFCODEC_3, if used for ingest
purposes, will both use the directory /usr/vtr/clips as the content ingest path.
Using House Timecode Readers with the SGI Media Server
The SGI Media Server supports the Miranda Little Red and Horita PR-232 timecode.
Their readers translate LTC to RS-232 timecode. Either of these devices provides a
frame-accurate time reference to an external timecode generator. With such a reader
attached, the SGI Media Server operations can then be synchronized with other studio
equipment or with scheduled live or downlink feeds.
The timecode signal connected to the SGI Media Server is used as the reference for
triggering timed-based commands for playback and recording. Frame accuracy is
guaranteed within the limits defined by the specifications for the SGI Media Server.
The time-of-day signal is also used to slave the time-of-day maintained by the IRIX
operating system. The time-of-day is typically maintained within one millisecond of the
input time signal.
To install a timecode reader and configure the SGI Media Server for it, follow these steps:
1. Connect the timecode reader’s serial port to the desired RS-232 port on the
SGI Media Server.
2. Install vst_eoe.sw.little-red.
3. Include a control port configuration line in the file
/usr/vtr/config/control-in.conf. See “Signal Configuration Line” on
page 50 for more information. Note the following:
• For timecode input, the signal port field (“signalport” on page 49) of the
configuration line specifies the time channel number, which must be 1 for this
release of the SGI Media Server.
• Both the Miranda Little Red and Horita PR-232 timecode readers connect at a
serial port speed of 9600 bits per second with no parity.