This document discusses video conferencing technologies including SVC scalability modes, H.264 and RTP, video profiles, features of video conferencing systems, standards for H.323-based systems, audio codecs for comparison, high level components of a video conferencing solution, examples of such components, and deployment models. It provides information on encoding technologies, protocols, system capabilities, and implementation approaches for video conferencing systems.

1. 1
Shri Balla
2014

2. Solution
example
Pic source ‐ Internet
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3. SVC operation
Pic source ‐ Internet
UC modes
• Mode 0: Non‐Scalable Single Layer AVC Bitstream
• Mode 1: SVC Temporal Scalability • Mode 2q: SVC Temporal
Scalability + Quality/SNR Scalability
• Mode 2s: SVC Temporal Scalability + Spactial Scalability
• Mode 3: Full SVC Scalability (Temporal + SNR + Spatial)
SVC is the heart of modern VC systems
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4. 4
H.264 and RTP
RTP-H NAL Unit RTP-H NAL Unit
Each NAL unit contains –
NAL Unit Header
Payload – RBSP – Raw Byte Sequence Payload
H.264 encoder composed of 2 layers –
VCL – Video Coding Layer
NAL – Network Abstraction Layer

5. Profiles
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HD‐720p 1280x720@60fps 4096kbps
HD 960x720@60fps 4096kbps
XGA 1024x768@35fps 6144kbps
WIDE FULL HD 1920x1080@30fps 10240kbps
FULL HD 1440x1080@30fps 8192kbps
HD‐720p 1280x720@30fps 2048kbps
HD‐720p 1280x720@30fps 1472kbps
HD‐720p 1280x720@30fps 1024kbps
HD‐720p 1280x720@30fps 768kbps
HD 960x720@30fps 2048kbps
432P 720x432@30fps 1024kbps
432P 720x432@30fps 768kbps
432P 720x432@30fps 512kbps
VGA 640x480@30fps 1024kbps also 480i(720x480) VGA
640x480@15fps 896kbps
VGA 640x480@30fps 512kbps
VGA 640x480@30fps 384kbps
W288P 512x288@30fps 384kbps
CIF 352x288@30fps 768kbp

6. Features AEC
AGC
NR
Multiprotocol support
Voice activated
Continuous presence
Hot standby
Low bandwidth
Wireless whiteboard + wireless
Digital Pen
Recording
Secure media and signalling
PSTN support
Group conference (2‐16 screens)
Tele‐presence
Large conferences (250+ users)
HD on demand
BYOD
Roaming
LDAP integration
Caller list
Missed calls
Address Book
File transfer
Instant Messaging
Website integration
Desktop sharing
Scheduling meetings
Streaming
STUN/TURN support
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7. H.32x based
standards
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8. Codec
Rate
(kHz)
bitrate (kbps)
delay
frame+look
ahead (ms)
multi
-rate
PLC bit-robust
Speex
8,
16,
32
2.15-24.6 (NB)
4-44.2 (WB)
20+10 (NB)
20+14 (WB)
yes yes
iLBC 8 15.2 or 13.3
20+5 or
30+10
yes
AMR-NB 8 4.75-12.2 20+5? yes yes yes
AMR-WB
(G.722.2)
16 6.6-23.85 20+5? yes yes yes
G.722.1
(Siren7)
16 (16) 24, 32 20+20 yes yes yes
G.729 8 8 10+5 yes yes
GSM-FR 8 13 20+?
GSM-EFR 8 12.2 20+? yes yes
G.723.1 8 5.3 6.3 37.5 yes
G.728 8 16 0.625
G.722 16 48 56 64
Audio Codec
comparison
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9. High Level
Solution
Components
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10. 10
Example of
Components

11. 11
Example of
Components…

12. 12
Solution
Models

13. Adding more
bandwidth to
existing network
Converged IP
IP overlay
network
Hybrid network
13
Deployment
Models