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QoE Evaluation Methodology for HD Video Streaming using Social Networking

QoE Evaluation Methodology for HD Video Streaming using Social Networking. 報告人：張景舜 作者 ： Gardlo , B . ； Ries, M. ; Rupp, M. ; Jarina, R . ； Dept. of Telecommun . & Multimedia, Univ. of Zilina , Zilina , Slovakia . I. INTRODUCTION.

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QoE Evaluation Methodology for HD Video Streaming using Social Networking

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  1. QoEEvaluation Methodology for HD Video Streaming using Social Networking 報告人：張景舜 作者：Gardlo, B.；Ries, M. ; Rupp, M. ; Jarina, R.；Dept. of Telecommun. & Multimedia, Univ. of Zilina, Zilina, Slovakia 

  2. I. INTRODUCTION • Quality-of-Experience (QoE) and Social networks has gained strong interest, both from a research and a commercial perspective. • Assessment methodologies are extremely time consuming and poorly reflect ”real world” scenarios.

  3. II. USER BASED ASSESSMENT • Relationship between user, application and network. • Absolute Category Rating (ACR)

  4. II. USER BASED ASSESSMENT • Influence factors of quality of experience(QoE)

  5. III. CONTEXT INFLUENCE AND QOE • Modern social networks rely not just on the messaging concept • 46% of them are under 25 years old and another 26% is under 35 years.

  6. III. CONTEXT INFLUENCE AND QOE • A. Audiovisual content • SPATIAL AND TEMPORAL CHARACTERISTICS OF CONTENT CLASSES • B. Social and Cultural Aspects

  7. IV. TECHNICAL SYSTEM • A. Encoder settings • Audio content was encoded using an AAC codec with 48 kHz sampling rate and96 kbit/s bit rate. • Each of these sequences was further encoded into five equally distanced video bit rates, 2 Mbit/s for the best quality, and 800 kbit/s for the lowest quality (300 kbit/s step size).

  8. IV. TECHNICAL SYSTEM • B. End User Devices • Targeting our QoE assessment application on the HD multimedia content, we cannot guarantee that this content will be also watched on native HD capable screens. • About 50% of the users use resolutions of 1024x768, 1280x800 or similar.

  9. V. QOE ASSESSMENT A. Statistical relevance of obtained subjective evaluations

  10. V. QOE ASSESSMENT • 評估方法 • s : sample variance • d : accuracy parameter (allowed error in estimation) • x^: sample mean • μ : true population mean • n : minimum sample size

  11. V. QOE ASSESSMENT • B. Assessment results Action movie 800 kbit/s MOS Histogram. Action movie 2000kbit/s MOS Histogram.

  12. V. QOE ASSESSMENT • MOS values with their 95% confidence intervals.

  13. VI. CONCLUSION • The methodology provides a high applicability for subjective testing of the multimedia services with respect to real usage scenarios. • With the social data available throughout the social network, we can target certain specific user groups, with no need of performing exhausting social studies. • All these facts support the high statistical significance of the results.

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