ifier</var>.
</p>
</dd>
<dt>&lsquo;<samp>#<var>stream_id</var> or i:<var>stream_id</var></samp>&rsquo;</dt>
<dd><p>Match the stream by stream id (e.g. PID in MPEG-TS container).
</p></dd>
<dt>&lsquo;<samp>m:<var>key</var>[:<var>value</var>]</samp>&rsquo;</dt>
<dd><p>Matches streams with the metadata tag <var>key</var> having the specified value. If
<var>value</var> is not given, matches streams that contain the given tag with any
value.
</p></dd>
<dt>&lsquo;<samp>u</samp>&rsquo;</dt>
<dd><p>Matches streams 