output. In the filtergraph, the input is associated to the label
<code>in</code>, and the output to the label <code>out</code>. See the
ffmpeg-filters manual for more information about the filtergraph
syntax.
</p>
<p>You can specify this parameter multiple times and cycle through the specified
filtergraphs along with the show modes by pressing the key &lt;w&gt;.
</p>
</dd>
<dt>&lsquo;<samp>-af <var>filtergraph</var></samp>&rsquo;</dt>
<dd><p><var>filtergraph</var> is a description of the filtergraph to appl