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spaper15_slides - A Comparison of Heterogeneous Video...

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A Comparison of Heterogeneous Video Multicast Schemes: Layered Encoding or Stream Replication Presented By Arunava Saha & Neeraj Ganapathy
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Abstract Ɣ Problem - Heterogeneity of receiver and network capabilities for multicast video streaming ż Low capacity ones are heavily loaded ż High capacity ones are under-utilized Ɣ Three main approaches - Replicated Streams, Cumulative Layering, Noncumulative layering Ɣ Common Belief: Layering approach is better. No systematic comparison
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Abstract Ɣ This paper aims to do exactly that taking into account ż Bandwidth overhead for layering ż Encoding specifics ż Protocol complexity ż Topological placement of sources & receivers Ɣ Results - Layering superiority not clear-cut. Replicated streams preferable in some cases
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Introduction to Concepts Ɣ Replicated Streams: ż Muticasts identical content at differenent data rates ż Receivers take suitable stream and can switch if required Ɣ Cumulative Layering: ż Encoded in a base layer (decoded independently) and 1+ enhancement layers (decoded cumulatively) ż Receivers take base layer and add/drop others as reqd. ż Supported by MPEG-2, MPEG-4, and H.263
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Concepts contd... Ɣ Noncumulative Layering: ż Encoded in 2+ independently decoded layers, each providing improvements to the video quality ż Receivers join any subset of the video layers ż Multiple description coding (MDC) can be used
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Concepts: Replicated Streams Streams of varying data rates High capacity Low capacity
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Concepts: Layered Streams Base stream (pink) and layered streams High capacity Low capacity
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