ecified in ff_udp_set_remote_url, too.
This allows finding out the source address for the packets with getsockname,
and makes writes return with AVERROR(ECONNREFUSED) if &quot;destination
unreachable&quot; is received.
For receiving, this gives the benefit of only receiving packets from
the specified peer address/port.
</p>
</dd>
<dt>&lsquo;<samp>sources=<var>address</var>[,<var>address</var>]</samp>&rsquo;</dt>
<dd><p>Only receive packets sent to the multicast group from one of the
specified sender IP addr