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<h2 class="title"><a name="sdi" id=
"sdi"></a>Chapter 31. Configuring SDI Video Output</h2>
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<p>Broadcast, film, and video post production and digital cinema
applications can require Serial Digital (SDI) or High Definition
Serial Digital (HD-SDI) video output. SDI/HD-SDI is a digital video
interface used for the transmission of uncompressed video signals
as well as packetized data. SDI is standardized in ITU-R BT.656 and
SMPTE 259M while HD-SDI is standardized in SMPTE 292M. SMPTE 372M
extends HD-SDI to define a dual-link configuration that uses a pair
of SMPTE 292M links to provide a 2.970 Gbit/second interface. SMPTE
424M extends the interface further to define a single 2.97
Gbit/second serial data link.</p>
<p>SDI and HD-SDI video output is provided through the use of the
NVIDIA driver along with an NVIDIA SDI output daughter board. In
addition to single- and dual-link SDI/HD-SDI digital video output,
Frame Lock and Genlock synchronization are provided in order to
synchronize the outgoing video with an external source signal (see
<a href="framelock.html" title=
"Chapter 30. Configuring Frame Lock and Genlock">Chapter 30,
<i>Configuring Frame Lock and Genlock</i></a> for details on these
technologies). This section describes the setup and use of the SDI
video output.</p>
<h3>Hardware Setup</h3>
<p>Before you begin, you should check that your hardware has been
properly installed. The following steps must be performed when the
system is off:</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>Insert the NVIDIA SDI Output card into any available expansion
slot within six inches of the NVIDIA Quadro graphics card. Secure
the card's bracket using the method provided by the chassis
manufacturer (usually a thumb screw or an integrated latch).</p>
</li>
<li>
<p>Connect one end of the 14-pin ribbon cable to the Quadro Sync
connector on the NVIDIA Quadro graphics card, and the other end to
the NVIDIA SDI output card.</p>
</li>
<li>
<p>Connect the DVI-loopback connector by connecting one end of the
DVI cable to the DVI connector on the NVIDIA SDI output card and
the other end to the "north" DVI connector on the NVIDIA Quadro
graphics card. The "north" DVI connector on the NVIDIA Quadro
graphics card is the DVI connector that is the farthest from the
graphics card PCIe connection to the motherboard. The SDI output
card will NOT function properly if this cable is connected to the
"south" DVI connector.</p>
</li>
</ol>
</div>
<p>Once the above installation is complete, you may boot the system
and configure the SDI video output using nvidia-settings. These
instructions assume that you have already successfully installed
the NVIDIA Linux Accelerated Graphics Driver. If you have not done
so, see <a href="installdriver.html" title=
"Chapter 4. Installing the NVIDIA Driver">Chapter 4,
<i>Installing the NVIDIA Driver</i></a> for details.</p>
<h3>Clone Mode Configuration with <span><strong class=
"command">nvidia-settings</strong></span></h3>
<p>SDI video output is configured through the nvidia-settings
utility. See the <code class="filename">nvidia-settings(1)</code>
man page, and the nvidia-settings online help (click the "Help"
button in the lower right corner of the interface for per-page help
information).</p>
<p>After the system has booted and X Windows has been started, run
nvidia-settings as</p>
<pre class="screen">
% nvidia-settings
</pre>
<p>When the NVIDIA X Server Settings page appears, follow the steps
below to configure the SDI video output.</p>
<div class="orderedlist">
<ol type="1">
<li>
<p>Click on the <code class="computeroutput">Graphics to Video
Out</code> tree item on the side menu. This will open the
<code class="computeroutput">Graphics to Video Out</code> page.</p>
</li>
<li>
<p>Go to the "Synchronization Options" subpage and choose a
synchronization method. From the <code class="computeroutput">Sync
Options</code> drop down click the list arrow to the right and then
click the method that you want to use to synchronize the SDI
output.</p>
<div class="informaltable">
<table summary="(no summary available)" border="0">
<colgroup>
<col>
<col></colgroup>
<thead>
<tr>
<th>Sync Method</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>Free Running</td>
<td>The SDI output will be synchronized with the timing chosen from
the SDI signal format list.</td>
</tr>
<tr>
<td>Genlock</td>
<td>SDI output will be synchronized with the external sync
signal.</td>
</tr>
<tr>
<td>Frame Lock</td>
<td>The SDI output will be synchronized with the timing chosen from
the SDI signal format list. In this case, the list of available
timings is limited to those timings that can be synchronized with
the detected external sync signal.</td>
</tr>
</tbody>
</table>
</div>
<p></p>
<p>Note that you must first choose the correct Sync Format before
an incoming sync signal will be detected.</p>
</li>
<li>
<p>From the top Graphics to Video Out page, choose the output video
format that will control the video resolution, field rate, and
SMPTE signaling standard for the outgoing video stream. From the
<code class="computeroutput">Clone Mode</code> drop down box, click
the <code class="computeroutput">Video Format</code> arrow and then
click the signal format that you would like to use. Note that only
those resolutions that are smaller or equal to the desktop
resolution will be available. Also, this list is pruned according
to the sync option selected. If Genlock synchronization is chosen,
the output video format is automatically set to match the incoming
video sync format and this drop down list will be grayed out
preventing you from choosing another format. If Frame Lock
synchronization has been selected, then only those modes that are
compatible with the detected sync signal will be available.</p>
</li>
<li>
<p>Choose the output data format from the <code class=
"computeroutput">Output Data Format</code> drop down list.</p>
</li>
<li>
<p>Click the <code class="computeroutput">Enable SDI Output</code>
button to enable video output using the settings above. The status
of the SDI output can be verified by examining the LED indicators
in the <code class="computeroutput">Graphics to SDI property</code>
page banner.</p>
</li>
<li>
<p>To subsequently stop SDI output, simply click on the button that
now says <code class="computeroutput">Disable SDI
Output</code>.</p>
</li>
<li>
<p>In order to change any of the SDI output parameters such as the
Output Video Format, Output Data Format as well as the
Synchronization Delay, it is necessary to first disable the SDI
output.</p>
</li>
</ol>
</div>
<p></p>
<h3>Configuration for TwinView or as a Separate X Screen</h3>
<p>SDI video output can be configured through the nvidia-settings X
Server Display Configuration page, for use in TwinView or as a
separate X screen. The SDI video output can be configured as if it
were a digital flat panel, choosing the resolution, refresh rate,
and position within the desktop.</p>
<p>Similarly, the SDI video output can be configured for use in
TwinView or as a separate X screen through the X configuration
file. The supported SDI video output modes can be requested by name
anywhere a mode name can be used in the X configuration file
(either in the "Modes" line, or in the "MetaModes" option).
E.g.,</p>
<pre class="screen">
Option "MetaModes" "CRT-0:nvidia-auto-select, DFP-1:1280x720_60.00_smpte296"
</pre>
<p>The mode names are reported in the nvidia-settings Display
Configuration page when in advanced mode.</p>
<p>As well, the initial output data format, sync mode and sync
source can be set via the <a href=
"xconfigoptions.html#GvoDataFormat"><code class=
"computeroutput">Option "GvoDataFormat" "string"</code></a>,
<a href="xconfigoptions.html#GvoSyncMode"><code class=
"computeroutput">Option "GvoSyncMode" "string"</code></a>, and
<a href="xconfigoptions.html#GvoSyncSource"><code class=
"computeroutput">Option "GvoSyncSource" "string"</code></a>. See
<a href="xconfigoptions.html" title=
"Appendix B. X Config Options">Appendix B, <i>X
Config Options</i></a> for instructions on how to set these X
options.</p>
<p>Note that SDI "Clone Mode" as configured through the Graphics to
Video Out page in nvidia-settings is mutually exclusive with using
the SDI video output in TwinView or as a separate X screen.</p>
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