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The Impact of Network on Video Quality

The Impact of Network on Video Quality. Anatoli Levine Director, Product Management Radvision, an Avaya Company . Outline. Importance of Video Quality Factors affecting QoE QoE challenge Video Quality measurement Steps in implementing Video Evident Monitoring Solution .

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The Impact of Network on Video Quality

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  1. The Impact of Network on Video Quality Anatoli Levine Director, Product Management Radvision, an Avaya Company

  2. Outline • Importance of Video Quality • Factors affecting QoE • QoE challenge • Video Quality measurement • Steps in implementing Video • Evident Monitoring Solution

  3. The Importance of the Video Quality • Video services are becoming a popular mode of communication • The visual sense is extremely important • How do network conditions affect Voice & Video Quality? • Is your network ready to provide Video services?

  4. Video is Everywhere! Video Conferencing & Telepresence IM &Video Messengers Social Networking Sites Video Conferencing ASPs Video Streaming Video Mobile Video Web Collaboration IP Video Surveillance

  5. IP Network Parameters Affecting Quality of Audio ? Sender Receiver Unpack Decoder Jitter buffer Encoder Packetize Distortion & delay Codec impairment Delay Delay & Loss Delay Loss, Delay, Jitter, Ordering, Duplicate,….. Delay End-to-end perceived voice quality (MOS)

  6. Why Interactive Video Is So Unique ? • 250ms • Interactive video is sensitive to latency • x20 • Video is high capacity • 1:400 • Video is error sensitive • 2-20 • Packets/frame • Video traffic is not uniform or constant • +45ms / • -75ms • Interactive video is sensitive to lip sync Source: IEEE publications

  7. Packet loss Encoding and Compression Parameters Affecting Quality of Experience Frame per seconds

  8. Audio / Video Quality Scoring • Mean Opinion Score (MOS) • The arithmetic mean of all individual observations, ranging from 1 (Bad) to 5 (Excellent).

  9. Questions • Can my network support full video services ? • What is the expected video / audio quality after full deployment ? • Do I expect to have interoperability issues ? Pre-deployment • Why do I suffer from pixelated video / freezes ? • How network conditions affect my video ? • Why do I have interoperability issues ? • Why do I have audio issues ? Post-deployment In-Service • What is the status of the calls on my network ?

  10. Video Quality Measurement Methodology

  11. Media Quality Becomes an Issue • Unmanaged Networks • Varying Network Capacities • Varying Devices

  12. Factors Affecting Video Over IP Quality Source: Packet loss, for instance, is considered by many to be the most annoying disturbance in interactive video communications. In fact, in a poll question we posted in a recent webinar on user experience, 46% of the participants chose packet loss as the factor that affects the quality of real-time video most.

  13. Video Quality Measurement Methodologies “Full-Reference”Based “No Reference” Online Real-time “No Reference” Image Based

  14. Video Quality Full-reference • Full-reference allows you to perform a Video Quality analysis and compare the original video sequence to a degraded one: • Unique synchronization algorithm developed by Radvision take on consideration: • Different frame rates, Resizing, profile, codec, bw…. • Partial picture, Picture in picture, Compression artifacts • Black period, Welcome frames, Logo additions, Title additions • Video Quality algorithm based on frame analysis

  15. Video Quality Real-time Measurement • Video Quality Online Standards • ITU G.1070 performs global video quality estimation based on network and codec parameters that are unprecedented in scope to guarantee that the tool maintains the highest correlation with video quality test results measured by individual perception. • ITU-T G.1070 (Objective Video Quality) • ITU-R BT.500-9. (Subjective) • Human Vision Survey • Extensive & Automated Human Vision survey based on Full-Reference • Radvision Innovative techniques

  16. Human Vision Database • Video Quality Surveys • Unprecedented in scope (x1000 inputs) • Variable contents: video conferences, motion pictures… • Variable artifacts: blockiness, packet loss, blurriness… • Worldwide, different viewing preferences

  17. Extensive & Automated Human Vision Survey • Guarantees high correlation with Human Perception • Database enhanced with state-of-the-art RV Full-Reference algorithms • RADVISION’s Human Vision Database was enhanced with thousands of video samples and their references, designed for objective analysis. • We applied state-of-the-art RV Full-Reference (FR) standard Video Quality algorithms, and obtained a Full-Reference recommended Video Quality score

  18. Innovative VQ Measurement Algorithms • Additional algorithms for performing global video quality estimation, based on: • Packet-loss propagation • Quality score based on compression level • Bit-rate and frame-rate fluctuation as an indication of quality • Quality score based on the dynamism level of the video • Reason for Video Quality degradation, as well as optimization methods

  19. Effect of Packet Loss Propagation • Advanced techniques for packet loss propagation analysis, based on: • Refresh rate – Intra frame or Intra macro blocks • Packet loss percentage • Packet loss patterns Standard VMOS: 4.4 RV VMOS: 4.4 Standard VMOS: 3.4 RV VMOS: 2.4 Standard VMOS: 4.4 RV VMOS: 2.4 Propagation of Packet loss No Packet loss Packet loss

  20. Video Quality, Image-Based • Performs Video Quality analysis without reference and without network parameters, based on image quality: • Blockiness, blurriness, image loss, … • Video MOS is the aggregate of video metrics • CPU consumption is very extensive

  21. How to Detect Image Quality Loss • Video packet loss concealment detection based on image content • Innovative research presented in 16th European Signal Processing Conference (EUSIPCO2008) • Different algorithm for I-frame and P-frame • Over 90% detection precision

  22. Steps in Implementing Video 23

  23. Steps in Implementing Video • Real Time Monitoring • QoE Test and Optimize Your Network • Network Readiness • for voice & video

  24. eVident Video Monitoring

  25. eVident Monitoring Solution • Video Network Monitoring - Market Segment • Service Provider • Video Network readiness • Room and network assessment • Proactive monitoring and management • Video Service readiness • Improving Video services • System Integrator • Network readiness as service • Video Service availability • Proactive monitoring and management • Real-time monitoring • Easier deployment Enterprise Video Network readiness Pre-Call assessment Room and network assessment Proactive monitoring and management Improve network visibility • Complete Video Monitoring Solution

  26. eVident Monitoring Solution The Intelligent and Easy Way to Monitor your Video Network Radvision provides a software-based monitoring solution for use during various stages of the network deployment cycle: • Real Time Video Monitoring • Pre & Post Deployment Video Network Readiness • Video Quality Measurement and Analysis

  27. eVident Benefits • Reduction in customer turn-up costs • Lower network operations center costs • Monitor and proactively troubleshooting V2oIP calls • Increased customer satisfaction • Minimize deployment time • Providing eVident based analysis as a service to customers.

  28. Radvision’s PreVideo • PreVideo ensures: • Network readiness for Voice and Video over IP (HD) • Correct network configuration • Client/Server architecture • Topology emulation, including interaction with various types of infrastructures • Problem prevention by proactive testing • Optimal end-user experience (voice and video quality)

  29. PreVideo – Distributed Solution PreVideo Agent Tokyo PreVideo Agent Paris Manager

  30. PreVideo - Functionality • Support SIP, H323, CISCO/TIP • Voice & Video Quality MOS • Hundred of calls simultaneously • XML – Remote Control API • Report PDF, EXL, WORD Format • USB Agent Key (Plug & Play) • Pre-Call Self Testing • QoS

  31. Analyze and Measure Your Audio & Video • Measure and analyze Audio and HD Video Quality • Cause analysis • Quality improvement options NETWORK CAPTURE

  32. Real Time Video Monitoring Solution • Real-time QoE Monitoring • Non-intrusive (Agent-less) • Multiple Vendor Support (Radvision, Polycom, Lifesize, Tandberg, Cisco) • P2P and Conference Call • Problem Detection and Solution • CDR with QoE as Metrics (History) • Alerts on Problems (< threshold) – Alarms • System Performance Analysis • Analyzes QoE Trends & Reports

  33. RVMON – Architecture WEB Interface Reporting Radvision EPs can send additional information Alarm Notification

  34. eVident Monitoring - Benefit • Enhances pro-active efforts to avoid service quality problems before deployment; • Ensure high quality end-user experience • Automate, isolate and analyze video problems • Increases the efficiency of reactive measures by providing real-time analysis and diagnostics • Diagnostics and troubleshooting • Reduced customer service response time • Optimizes intelligent database indexing and integrated call history End-to-end integrated solution Complete Monitoring Solution

  35. Articles embedded-computing TMCNET blog.radvision blog.radvision

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