it's mandatory to add a multicast stream to convert the multicast frame to unicast frame.
Yes,you are right,without Video Stream feature AP won't convert a multicast frame to Unicast at the AP. If it is transmit to client as a multicast frame, then it is not reliable (no re-transmission, send at highest mandatory rate configured - not 802.11n rates)
It's mandatory too to send the multicast frame (unicast) with UP 4.
This is not configurable, as long as you configured WLAN for platinum profile (ie allow upto UP value of 6 frames within the BSS) AP will automattically mark video unicast traffic to UP of 4 (AC_VI or Video classification). So these frames will get priority over other BE or BK (Best Effort or Backgroud ) traffic.
Video stream feature works only from wired to wireless multicast. Do you know why this feature doesn't work from wireless to wired network ?
When it comes to wireless upstream, it is very difficult to AP to control that traffic. It is purely upto wireless client to decide how wireless end device mark that traffic. Once traffic hits the AP then again traffic will be CAPWAP back to WLC & your wired network cannot see internal video traffic to give high priority within your wired network. So it is little bit different in this direction.
In downstream since AP is the last hop before the client, it can do the conversions, markup easily
Hope that make sense.
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Rasika
