SARA: Segment Aware Rate Adaptation for DASH Video Services
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1 SARA: Segment Aware Rate Adaptation for DASH Video Services, Venkatesh Tamarapalli*, Deep Medhi University of Missouri Kansas City * Indian Institute of Technology-Guwahati, India
2 Overview Introduction DASH Overview Related Work & Motivation Segment Aware Rate Adaptation Algorithm Experiment Setup & Evaluation Demo
3 Introduction HTTP Video streaming is the most popular service over the Internet In North America, Netflix and YouTube accounted for 43% of the peak hour download traffic in Advantages of HTTP based video streaming: Reuse of existing web architecture NAT/Firewall transversal DASH improves QoE by adapting the bitrate based on network conditions
4 5 Mbps Video Representations 2 Mbps 1 Mbps DASH Overview Web Server MPD File Client 1 Video 1 MPD File n Access Network n MPD File Client n Access Network
5 Related Work ABR Algorithms: Determine the bitrate for the next segment ABR algorithms of 3 popular video streaming services (Netflix, HULU, OSMF player) were found to have limitations [1] Too slow to converge Too many bitrate switching events Just not good enough QoE Categories of current ABR algorithms Throughput Based [2][3][4] Buffer Occupancy Based [5] [1] S. Akhshabi, A. C. Begen, and C. Dovrolis, An experimental evaluation of rate-adaptation algorithms in adaptive streaming over HTTP, in Proc. of the ACM conf. on Multimedia systems, [2] C. Liu, I. Bouazizi, and M. Gabbouj, Rate adaptation for adaptive HTTP streaming, in Proc. of the 2nd ACM conf. on Multimedia systems, [3] K. Miller, E. Quacchio, G. Gennari, and A. Wolisz, Adaptation algorithm for adaptive streaming over HTTP, in Packet Video Workshop (PV), th International. [4] J. Jiang, V. Sekar, and H. Zhang, Improving fairness, efficiency, and stability in HTTP-based adaptive video streaming with FESTIVE, in Proc. of the 8th Emerging networking experiments and technologies, [5] T.-Y. Huang, R. Johari, N. McKeown, M. Trunnell, and M. Watson, A buffer-based approach to rate adaptation: Evidence from a large video streaming service, in Proc. of the ACM SIGCOMM, 2014.
6 Motivation To improve the QoE of DASH Video Quality, bitrate switching, convergence Current algorithms assume the segment sizes are constant (average segment size) The size of the HTTP objects affects the throughput
7 Rate Adaptation Model Initial video Rate and the MPD File Download & Measure H(n) Rate Estimation F(H(n), B(n), S(n+1)) Rate for next segment Buffer Occupancy Next Segment Sizes from MPD R(n+1) 7
8 SARA: Segment Aware Rate Adaptation Enhanced MPD File List the individual segment sizes during the pre-processing stage Throughput Estimation: Weighted Harmonic Mean Smart Segment Fetch Times Buffer Occupancy T n+1 = ω i n+1, H n H n = i=1 n n i=1 ω i ω i d i i List of bitrates
9 SARA: Buffer Mapping Buffer Map Thresholds 1. Fast Start (0 < B curr I ) Select the minimum bitrate to minimize playback start time 2. Additive Increase (I < B curr B α ) 3. Aggressive Switching (B α < B curr B β ) 4. Delayed Download (B β < B curr ) 0 I B α B curr B β B max Desired operation range
10 SARA: Algorithm
11 SARA: Algorithm (contd..)
12 Setup & Evaluation Astream Python based emulated DASH client Rate Adaptation Modules: Throughput Based (tba) Buffer Based (bba) SARA Available on Github: Evaluation Scenarios Limited Bandwidth Short Interruptions Long Interruptions For more details please refer to P. Juluri, V. Tamarapalli, and D. Medhi, SARA: Segment Aware Rate Adaptation algorithm for Dynamic Adaptive Streaming over HTTP, in ICC QoE-FI Workshop, June, 2015
13 GENI Topology
14 Sample LabWiki Output
15 Thanks! Questions or Comments?
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