Information about Media Stream
The IEEE 802.11 wireless multicast delivery mechanism does not provide a reliable way to acknowledge lost or corrupted packets. As a result, if any multicast packet is lost in the air, it is not sent again which may cause an IP multicast stream unviewable.
The Media Stream feature makes the delivery of the IP multicast stream reliable over air, by converting the multicast frame to a unicast frame over the air. Each Media Stream client acknowledges receiving a video IP multicast stream.
Support for IPv6 was added from Cisco IOS XE Gibraltar 16.12.1. You can use IPv6 multicast addresses in place of IPv4 multicast addresses to enable media stream on the IPv6 networks.