Презентация на тему «Jingyu Qiu Sr»

Jingyu Qiu Sr

Program Manager Microsoft Corporation

OCS Video Conferencing

Agenda

Our Vision OCS 2007 Feature Set OCS 2007 Video Deep Dive Interop with Tandberg and Polycom OCS Video Roadmap Q&A

Our Vision

Make video conferencing useful, usable and affordable to the mass Help people save travel, work more efficiently Help company save money and improve productivity Make the world a better place to live

Video Conferencing Reality

Since 60’ Not meeting expectation Low quality, not useful Hard to use Low usage No ROI model Good Sign in 2007 Is the time for video conferencing coming?

Our Multi-Release Approach

Every release, we focus on improving

Area of Focus

OCS 2007

OCS 2008 …

High Quality Audio/Video

Ease of Use

Reliability

Network Resilience

Affordability

Face to Face Experience

OCS 2007 Video Capabilities

Point to Point Video “calls” Escalate to Video Multi-point Video conferences Escalate to conference

OCS 2007 Video Components

ISDN

UC endpoints

DMZ

Remote Users

Federated Businesses

3rd Party Video Conference Endpoints

Data Audio/Video

SIP

Access Server(s)

QOE Monitoring Archiving CDR

Active Directory

Inbound Routing

Outbound Routing

Voice Mail Routing

Front-End Server(s)

Conference Server(s)

Backend SQL server

OCS 2007 Demo

P2P Video From Outlook, OC, Audio Elevation Multiparty Video From OC, P2P Elevation, Audio Elevation Live Meeting Video Video Setup Firewall Traversal

OCS 2007 Video Deep Dive

Codec Quality Ease of Use Reliability Network Resilience Affordability

Area of Focus

High Quality Audio/Video

Ease of Use

Reliability

Network Resilience

Affordability

Face to Face Experience

Video Codec

VC1 Codec Used in WMV 9, next generation DVD formats, SMPTE-421M standard since April 2006 High Quality, High Compression, Low CPU RTVideo – VC1 Extension RTVideo Challenges Real Time Bandwidth Packet Loss

Video Encoding Pattern

IBBP Video Frame Pattern Intra Frame and Inter Frame Inter Frame Dependency GOP Structure 10 Second GOP, 15 FPS System Design Around Encoding Pattern Channel Protection Active Video Switching Rate Matching

Bitstream Structure

I: Intra Frame

P: Prediction Frame

B: Bidirectional Frame

SP: Super P Frame, VC1 Extension

I

I

SP

SP

P

P

P

P

B

B

B

B

B

B

B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

I

P

B

SP

B

P

B

SP

B

P

B

I

B

P

B

Artifact

A packet loss in I Frame

Causes whole I Frame Loss

Causes Artifact till next I frame

I

I

SP

SP

P

P

P

P

B

B

B

B

B

B

B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Artifact

A packet loss in SP Frame

Causes artifact till next I frame

I

I

SP

SP

P

P

P

P

B

B

B

B

B

B

B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Artifact

A packet loss in P Frame

Causes artifact till next I/SP frame

I

I

SP

SP

P

P

P

P

B

B

B

B

B

B

B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Artifact

A packet loss in B Frame

Causes no artifact

I

I

SP

SP

P

P

P

P

B

B

B

B

B

B

B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Encoder/Decoder Flow

Camera

Render

Encoder

Decoder

Crossbar

Crossbar

Crossbar

Media RTP

Network Device

Src

Sink

Network Device

Preview

Quality Controller

Quality Controller

Quality Controller

Signaling Control RTCP

Error Recovery

Rate Matching

Sender

AVMCU

Receiver

I

BW Estimate

BW Estimate

Packet Loss Report

Feature Set

Codec: RTVideo, H.263 (fall back) 1:1, Multi-party Video NAT/Firewall Traversal (no need for VPN) SRTP Video Archiving

Resolution

BW (kbps)

CPU

CIF@15

100-350

1.5G

VGA@15

400-800

Dual Core

Pano@15

100-350

Dual Core

Quality In OCS 2007

Advanced VC1 Codec CIF, VGA Low BW Usage Wideband Audio Network Resilience Quality of Experience Quality Monitoring

Usability In OCS 2007

One Click to Start Video Never Set BW Never Set Firewall Never Set Codec Never Set Security No Special Hardware UC Webcam

Reliability In OCS 2007

Reliable firewall traversal Network resilience Simple reliable hardware setup

Network Resilience In OCS 2007

Channel Protection Error Concealment Error Recovery Dynamic BW Allocation

Channel Protection

Goal: Improve perceived video quality in a lossy network System Design Forward Error Correction Error Concealment Error Recovery Result Packet Loss Impact become un-noticable

Forward Error Correction

Goal: Reduce Frame Loss Probability Design Packet Level Protection using Redundant Data Protect Key Frames Only 10% extra protection bits Result @ 1% loss network I frame loss rate: 10% -> 0.1% Artifact: 30% -> 6%

Error Concealment

Goal: Hide Artifact Human eyes more sensitive to artifact than to short frozen video Design Share frame dependency info between sender/receiver Hide frames with impaired dependency Result Zero Artifact

Error Recovery

Goal: Reduce Frozen Video Interval Worst: GOP(10 Sec) Design Receiver Sends Packet Loss Report Sender Resends I/SP frame Result Frozen interval < RTT time (200ms, 3 frames)

Dynamic BW Allocation

Cannot Predict Available BW At Beginning Dynamic BW Allocation BW Estimation Every 5 Seconds BW Allocation to Audio Video Channels Reset Encoder Bitrate QP, Frame Rate, Resolution Optimal QoE Given Available BW

Affordability In OCS 2007

Commodity Hardware, WinTel, Webcam, Headset Scalable AVMCU Server How to Handle Heterogeneous End Point Easy Admin, lower TCO

Video Conferencing

Large Multiparty Video Conf Up to 250 participants Live Meeting Can do Even More Switched Video (one video window) Active speaker switching Manual switching Rate Matching Video Archiving Client/Server side archiving

Rate Matching

Scale Down Video Stream on low speed link in AVMCU

Remove frames without causing artifact

I

I

SP

SP

P

P

P

P

B

B

B

B

B

B

B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Multi-Party Video

See A’s video

Firewall

B

Dominant Speaker: A

See Previous DS

AVMCU

See A’s video

Dominant Speaker Switching Manual Switching Rate Matching Error Recovery High Performant AVMCU

C

A

256K SP . . SP . . I

Error Recovery Upper Link

100M SP B P B SP B P B I

100M SP B P B SP B P B I

OCS 2007 Video Recap

Area of Focus

OCS 2007

OCS 2008

High Quality Audio/Video

Ease of Use

Reliability

Network Resilience

Affordability

Face to Face Experience

Interop With Tandberg

SIP Client using H.263 or RTVC1 Video Gateway

TANDBERG – OCS Interoperability Released solution

Simple to deploy TANDBERG endpoints register directly to OCS TANDBERG MCU registers conferences directly with OCS User Experience Calling a TANDBERG Endpoint is the same as calling a MOC client Click a contact to joing a multi-protocol conference Multiple User Scenarios Supported Persoanl Telepresence Conference Rooms Telepresence Stutios

SIP

MOC

Exec Desktop

Board Room

Telepresence Studio

MCU

TANDBERG – OCS Interoperability – Roadmap Media Gateway

Enhanced Media Support RTV to H.264 Transcoding – enables HD interoperability TANDBERG HD Webcamera and MOC User Experience Same consistenet user experience

Video Communication Server

H.323 and SIP

SIP

Media Gateway

Content Server

HD MCU

Exec Desktop

Interop With Polycom

SIP Client H.263 Native End Point (RTVC1)

Polycom Video Components In An Office Communications Server 2007

Topology

H.323

PSTN

Office Communications Server 2007

CX700

CX200

H.323 Gateway

PSTN Gateway

CX100

Voice Gateway

Exchange Server 2007

Active Directory

Traditional PBX

Traditional Phones

Three Phase Video Integration into Office Communications Server 2007

Phase 1 Q2/3, 08

Phase 2 Q2, 09

Phase 3 2H, 09

Seamless interoperability Point to point calling between HDX and Office Communicator Companion HDX – forked calls to OC client and HDX Meet-me conferencing with RMX

Full integration and manageability VC2 compliance Support for large-scale video management Federation and security

Native Interoperability Support for Microsoft’s RTVideo and RTAudio codec’s Aligned with Microsoft’s Wave 14 release of OCS 2007

38

OCS Video Roadmap

Area of Focus

OCS 2007

Next OCS

High Quality Audio/Video

Ease of Use

Reliability

Network Resilience

Affordability

Face to Face Experience

OCS Video Future

VGA/HD 720P 1:1 and Multi-party Mixed Video (CIF/VGA/HD) Capability Negotiation Partner/EcoSystem Play $300 HD Webcam From Tandberg Tandberg/Polycom Signs RTVideo Porting Kit Interop With VTC System

Want To Be An Expert

http://technet.microsoft.com/office/ocs/

Get in depth and up to date technical resources from TechNet Leverage the variety of Webcasts and Virtual Labs available Be part of the OCS Product Dialogue Join the OCS Community

© 2008 Microsoft Corporation

All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Appendix

Telepresence Myth

Immersive Experience Life size image Better Eye Gaze Spatial Audio High Quality Audio/Video Ease of Use Reliability Feels like Private Jet

Telepresence Demystified

Immersive Experience Camera Angle, Display Size, Spatial Audio, Position Camera on top, Geometry High Quality Audio/Video HD Audio Video, Low Latency, jitter, lip sync Ease of Use Hide technology from UI Reliability: Dedicated Network, Dedicated Support Feels like Private Jet – Costs Like one too

Do You Need Telepresence

Yes, your CEO asked for it Private Jet in VTC For the rest of us HD Camera on top of screen Full screen video on a larger screen Quad Core Machine Good lighting Good Microphone Good speaker $3000 price tag