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VBrick WM Appliance Admin Guide 89
Chapter 3
SDI Configuration
Topics in this chapter
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
SDI Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
SDI Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
Introduction
Serial Digital Interface, or SDI, is mainly used in the professional industry and is based on
the principal standard for broadcast television and the motion picture industries. Reliable,
flexible and cost-effective video transport is critical to the video transmission industry, which
provides state-of-the-art transport services for broadcast networks, content producers,
entertainment programmers, news agencies and sportscasters throughout the world. SDI
provides users the best available video quality with virtually no latency.
The Serial Digital Interface version of the WM Encoder includes an extra hardware module
that plugs into the encoder card, allowing the broadcast industry standard 270 Mbps serial
signal to be converted to Windows Media. The Serial Digital Interface input module accepts
the Society of Motion Picture and Television Engineers industry-standard, SMPTE 259M-C
compliant signals at 270 Mbps. The standard specifies a Serial Digital Interface (SDI) for
digital video equipment operating at either the 525-line, 60 Hz or 625-line, 50 Hz video
standard. After VBrick's Windows Media conversion, the compressed video can be
transported and utilized over a standard IP network.
The SDI module extracts AES/EBU or non-AES/EBU audio from Group 1 channels 1–4
from the incoming 270 Mbps data stream. These audio channels are embedded into the SDI
video stream and occupy space in the horizontal and vertical blanking interval. These four
channels are extracted into two SDI stereo streams of audio.
SDI 1-2 contains the stereo
channels 1 and 2 from Group 1 of the embedded audio. SDI 3-4 contains the stereo channels
3 and 4 from Group 1 of the embedded audio. The VBrick's SDI module can capture and
encode either channels 1 and 2, or channels 3 and 4 from the SDI stream. Audio embedded
in Groups 2, 3, and 4 of the SDI stream cannot be utilized by the VBrick. If desired, the
VBrick can be configured to ignore any embedded SDI audio and instead encode audio from
its analog audio inputs at the same time it encodes video from SDI.
SDI Configuration
WM SDI encoders have nearly identical configuration parameters and IWS pages as standard
WM encoders (see Configuration: Encoder on page 23) except that the WM SDI encoder has
an additional
Video Input Type selection for SDI and it has additional Audio Input selections
for
SDI 1-2 and SDI 3-4.