IP Video Communication Issues & Solutions Amir Zmora, RADVISION

Amir Zmora, RADVISION

State of IP Video Communication

From Picturephone to Telepresence

This is Telepresence Matt Harding dancing over Telepresence @ Yahoo headquarters

Matt Harding dancing over Telepresence @ Yahoo headquarters

Evolution of Video Standards

H.26x Lifecycle Status H.264 H.263 H.261

Who is to Blame? The network Bandwidth Packet Loss Burstiness

The network

Bandwidth

Packet Loss

Burstiness

Packet Loss

Packet Loss Random Noise Artifacts

Insufficient Bandwidth Trails

High Compression Rate Blockiness Effect

Advanced Video Coding Technologies Focus on Quality of Experience

P-Frame Dependency Result – Packet loss has dramatic effect on quality of experience 1 2 3 4 5

Multi Description Coding Splitting one source of information to multiple entities Each decodable The more the merrier – Quality Example – splitting of PCM stream

Splitting one source of information to multiple entities

Each decodable

The more the merrier – Quality

Example – splitting of PCM stream

Scaled Video Coding (SVC) Uses MDC concept H.264 Annex G Spatial - Change of frame size (resolution) Temporal - Change of frame rate Fidelity / SNR - Change of quality Object - Selection of “Region of interest”

Uses MDC concept

H.264 Annex G

Spatial - Change of frame size (resolution)

Temporal - Change of frame rate

Fidelity / SNR - Change of quality

Object - Selection of “Region of interest”

Spatial Scalability

Temporal Scalability Hierarchal P Structure

Hierarchal P Structure

Signaling layered decoding dependency 96 97 98 99 100 101 OR OR AND L1 L2 L3

Error Resilience – Protecting only what Matters Forward Error Correction Retransmission Video Fast Update

Forward Error Correction

Retransmission

Video Fast Update

Error Resilience MDC: Hierarchical P-Structure

Putting it All Together