Bilkent University
Department of Computer Engineering


HTTP Adaptive Streaming Enhancements for Large-Scale Deployments


Ali C. Beğen

HTTP adaptive streaming (HAS) has become the technology of choice for delivering video content over the Internet. It will play an increasingly important role in delivering managed video to the primary and secondary screens of paid TV subscribers. In HAS, streaming clients are offered multiple representations of the same content and clients independently decide what to fetch from the server(s) based on a number of individual observations they make. Our earlier research has shown that a number of issues such as unfairness, instability and network underutilization arise when streaming clients start competing for bandwidth, resulting in a poor experience for users and revenue loss for over-the-top (OTT) and service providers. In this talk, we first discuss what issues exist when and why in large-scale HAS deployments, and then present a number of client, server and network-based solutions. These solutions help streaming clients make more accurate observations and achieve more consistent-quality streaming while enabling the OTT and service providers to deliver a fair service with good network utilization.

Bio: Ali C. Begen is with the Video and Content Platforms Research and Advanced Development Group at Cisco. His interests include networked entertainment, Internet multimedia, transport protocols and content delivery. Ali is currently working on architectures and protocols for next-generation video transport and distribution over IP networks. He is an active contributor in the IETF and MPEG, and has given a number of keynotes, tutorials and guest lectures in these areas.

Ali holds a Ph.D. degree in electrical and computer engineering from Georgia Tech. He received the Best Student-paper Award at IEEE ICIP 2003, the Most-cited Paper Award from Elsevier Signal Processing: Image Communication in 2008, and the Best-paper Award at Packet Video Workshop 2012. Ali has been an editor for the Consumer Communications and Networking series in the IEEE Communications Magazine since 2011 and an associate editor for the IEEE Transactions on Multimedia since 2013. He served as a general co-chair for ACM Multimedia Systems 2011 and Packet Video Workshop 2013. He is a senior member of the IEEE and a senior member of the ACM. Further information on Ali’s projects, publications, presentations and professional activities can be found at


DATE: 16 June, 2014, Monday @ 13:40