I have reviewed this document as part of the Ops area directorate's ongoing effort to review all IETF documents being processed by the IESG.  These comments were written primarily for the benefit of the Ops area directors.
Document editors and WG chairs should treat these comments just like any other last-call comments.

Summary: the document describes many issues associated with streaming video. The description is very clear and it is very useful to have those problems documented. 


Some questions for the description of Section 3.2 
 The first bullet describes the Media server's adjusting bandwidth in responding to the application-level feedback that indicates a bottleneck link somewhere along the path. 

Question 1: is the "Link" in the sentence referring to the physical link between two routers along the path? How can application know the all the links along the path from the server to itself? let alone detecting which link is the bottleneck? 

 The second bullet describes the Media servers adjusting bandwidth by implementing some forms of congestion control that probe for bandwidth. 
The conclusion says that the QoE is poorer when the two methods don't coordinate. 

Question 2: Both methods are implemented on the Media server, they should coordinate by nature, aren't they? 

Thank you very much, 
Linda Dunbar