Upload
silas-harper
View
216
Download
0
Tags:
Embed Size (px)
Citation preview
The Way ForwardFactors Driving Video Conferencing
Dr. Jan Linden, VP of Engineering
Global IP Solutions
Globalization of business operations/Improved business economics
Increased productivity from face-face meetings without time lost traveling
Reduced travel costs
Corporate Greening
Unified Communications and Collaboration
Integration of P2P communications across multiple platforms
Video is a key component
Increased accessibility and affordabilityIncreased accessibility and affordability
Market Trends
5
6
Technology Trends
Migration from ISDN to IP Networks– Easier access– Less expensive
Increased availability of software platforms– Eliminates need for dedicated hardware– Provides greater flexibility and mobility– More cost effective
Improvements in capture devices– Higher quality - Up to HD resolution
– Greater accessibility - USB Cameras, Built-in Cameras
Technology Challenges
IP Networks Latency, jitter and
packet loss Bandwidth
Codec Design Many video codecs
focus on streaming vs. real-time media
Bit rate is an important factor in codec selection. The bit rate is determined by:
Frame rate, ResolutionQuality
Technology Challenges
7
Technology Challenges
Lip Synchronization– Audio and video out
of sync very annoyin
– People notice 80 – 130 ms out of sync
– Too early audio more annoying than the reverse
Device – Biggest issue in PC
multimedia is the unknown delay of the web camera
• Often 100 ms or more
– Better cameras can be connected for improved quality
• Attractive in fixed installations
Environment– Light is crucial to high quality video
Technology Challenges
8
IP Networks– No need for dedicated
bandwidth if solution includes high performance:
• Bandwidth management
• Robust codec framework
– Low latency achieved by efficient jitter buffer
Audio– The audio quality is crucial
for great total experience– Robust and bit-rate adaptive
codecs necessary• Efficient use of the total
available bandwidth
Recommendations
9
Recommendations
Codec Design– Codec frameworks designed
specifically for real-time conferencing
– Scalable Video Coders• Support for multiple
platforms on disparate networks
• Allow for each user to experience maximum possible quality
Devices– Profiling of cameras to
obtain best quality and delay• The range of quality is
significant
– When possible/necessary use high end camera rather than USB camera
10
11
Recommendations
Network throughput decreasing will NOT lead to POOR quality VideoGraceful degradation, gradually lowering frame rate, bit rate or image size
AdvancedAuto-
Adjustment
Channel throughput
Sending frame rate
Video Resolution
Image size
Quality preferences
Network condition
CPU utilization
Resolution
Camera capture rate
Rendering
Frame rate
Best Audio Video
Quality
GIPS VoiceEngine Multimedia
Lip sync
Audio/Video optimization
BandwidthUtilization
Traffic Shaping