GRASS VALLEY PROFILE XP PVS Series, Системное руководство

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23 July 2004 Profile XP System Guide
233
Chapter
8
Modifying a Channel: Ancillary Data
You can record and play back ancillary data on your high definition record or play
channels. You can also extract time code from ancillary data and record it as either LTC
or VITC, and play it back in that form. This chapter describes how to set up your system
to record and play ancillary data.
About Profile XP series ancillary data
The ancillary data supported by the Profile XP media platform for high definition video
complies with the following SMPTE standards or recommended procedures:
• SMPTE 291M-1998, Ancillary Data Packet and Space Formatting, the standard
which defines the formatting of the data packets in the serial digital video stream.
• SMPTE 334M, Vertical Ancillary Data Mapping for Bit-Serial Interface, which
contains the DID/SDID assignments for the “standard data types.”
• RP 188-1996, Transmission of Time Code and Control Code in the Ancillary Data
Space of a Digital Television Data Stream.
To record or play ancillary data, you first use the Configuration Manager to assign an
ancillary data track to the channel. You must also select a video input and output for the
track as appropriate for the channel configuration.
When recording, all ancillary data included in the serial bit stream is recorded in its
native format. Only time code can be extracted and stored separately. When the clip is
played, all its associated ancillary data is included in the serial bit stream if ancillary data
is configured on the output.
The Profile XP system ability to capture ancillary data packets is dependent on your
configuration. Please contact your Grass Valley representative to discuss your specific
requirements.
In all cases, packet overhead is included in the capacity. If more data is present on the
input, the later data is dropped and NetCentral is notified to alert you that this condition
occurred.