the impact of network on video quality


#AvayaATF

The Impact of Network on Video QualityAnatoli LevineDirector, Product ManagementRadvision, an Avaya Company


©2013 Avaya Inc. All rights reserved

February 26-28, 2013 | Orlando, FL3

Outline

• Importance of Video Quality

• Factors affecting QoE• QoE challenge• Video Quality

measurement • Steps in implementing

Video • Evident Monitoring

Solution




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?


©2013 Avaya Inc. All rights reserved February 26-28, 2013 | Orlando, FL5

IP Video Surveillance

Video Web Collaboration

Video Conferencing & Telepresence

IM &Video Messengers

Social Networking Sites

Video Conferencing

ASPs

Video Streaming Video Mobile

Video is Everywhere!



Parameters Affecting Quality of Audio ?

IP Network

Receiver

Encoder

Sender

PacketizeJitter

buffer DecoderUnpack

End-to-end perceived voice quality (MOS)

Loss, Delay, Jitter, Ordering, Duplicate,…..

Distortion & delay Delay Delay Delay &

LossCodec impairmentDelay



2-20Packets/frame

1:400

x20

250ms

Why Interactive Video Is So Unique ?

Interactive video is sensitive to latency

Video is high capacity

Video is error sensitive

Video traffic is not uniform or constant

+45ms /-75ms Interactive video is sensitive to lip sync

Source: IEEE publications



Parameters Affecting Quality of Experience

Packet loss

Encoding and Compression

8

Frame per seconds




Audio / Video Quality Scoring

• Mean Opinion Score (MOS) • The arithmetic mean of all individual observations,

ranging from 1 (Bad) to 5 (Excellent).

http://www.google.co.il/url?sa=i&rct=j&q=MOS+SCore&source=images&cd=&docid=PIiks_qu-P6baM&tbnid=VbMEkCXWz5-6aM:&ved=0CAUQjRw&url=http://www.pal-acoustics.com/index.php?a=services&id=143&ei=F4sjUe7BG8rWtAbbr4GgAQ&bvm=bv.42553238,d.Yms&psig=AFQjCNFUW6cV8I82-wIOY9xhpOtzoY91gA&ust=1361370255185134



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

Post-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 ?

In-Service • What is the status of the calls on my network ?


Video Quality Measurement Methodology

11




Media Quality Becomes an Issue

• Unmanaged Networks

• Varying Network Capacities

• Varying Devices



Factors Affecting Video Over IP Quality

13

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.

http://blog.radvision.com/voipsurvivor/2010/06/23/assessing-and-improving-quality-of-experience-the-webinar/



Video Quality Measurement Methodologies

“Full-Reference”Based

“No Reference” Image Based

“No Reference” Online

Real-time

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




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




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




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




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




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: 4.4RV VMOS: 4.4

No Packet loss Packet lossPropagation of

Packet loss






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




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


Steps in Implementing Video

23



Steps in Implementing Video

Network Readiness

for voice & video

Test and Optimize Your Network

Real Time Monitoring

QoE

Assess

Optimize

Monitor

24



eVident Video Monitoring

25



eVident Monitoring Solution

Service ProviderVideo Network readiness

Room and network assessment

Proactive monitoring and management

Video Service readiness

Improving Video services

EnterpriseVideo Network readiness

Pre-Call assessment

Room and network assessment


Improve network visibility

System Integrator Network readiness as service

Video Service availability


Real-time monitoring

Easier deployment

Video Network Monitoring - Market Segment

Complete Video Monitoring Solution



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:

Pre & Post Deployment Video

Network Readiness

Video Quality Measurement and

Analysis

Real Time Video Monitoring




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.




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)



PreVideo – Distributed Solution

Manager

PreVideo Agent Paris

PreVideo Agent Tokyo

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February 26-28, 2013 | Orlando, FL

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

CAPTURE

NETWORK




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

Actively Detects Control your infrastructure!

Tunes and Optimizes your

Network



Public InternetMPLS network

Location X Location Y

Main Location

MCURVMON

EPEP

Gatekeeper

SCOPIA XT

Gatekeeper

MCU

Gatekeeper

SCOPIA Elite MCU

RVMON – Architecture

Radvision EPs can send additional

information

WEB Interface

Reporting

AlarmNotification



Complete Monitoring Solution

• 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

eVident Monitoring - Benefit



Articles

embedded-computing TMCNET

blog.radvision blog.radvision


Thank you!#AvayaATF

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the impact of network on video quality

Documents

video quality video

msinteractive video

developing video

video image

video chat

voice video quality

rights reservedfebruary

various video applications