nels</samp>&rsquo;</dt>
<dd><p>Defines number of audio channels to capture. Must be &lsquo;<samp>2</samp>&rsquo;, &lsquo;<samp>8</samp>&rsquo; or &lsquo;<samp>16</samp>&rsquo;.
Defaults to &lsquo;<samp>2</samp>&rsquo;.
</p>
</dd>
<dt>&lsquo;<samp>duplex_mode</samp>&rsquo;</dt>
<dd><p>Sets the decklink device duplex mode. Must be &lsquo;<samp>unset</samp>&rsquo;, &lsquo;<samp>half</samp>&rsquo; or &lsquo;<samp>full</samp>&rsquo;.
Defaults to &lsquo;<samp>unset</samp>&rsquo;.
</p>
</dd>
<dt>&lsquo;<samp>video