Transcript The Transformation of Distance Education

Streaming Video:
Instructional Applications and Considerations
Faculty Development Institute
Summer 2000
The Quest for Scalable and
Effective Instructional
Delivery Systems
Streaming Video:
Project Objectives
#1
Be on the cutting edge not
the bleeding edge
Streaming Video Defined
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One way compressed digital distribution
Live or on demand
Point-to-point
Multicast
Streaming Video:
Project Objectives
• Distance Learning
– Live streaming to the desktop
– Anytime, anyplace video-on-demand
– Use video-on-demand to replace videotape
backup
– Video-on-demand as supplement to web-based
courses
Streaming Video:
Project Objectives
• Campus
– Incorporate into class presentations
– Lecture review
– Out of class video assignments
Streaming Video:
Project Objectives
• Continuing Education on-demand seminars
• Faculty and staff training
• University marketing
Streaming Video Evaluations
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High and Low Bandwidth Tests
Encoding methods
Storage requirements
Impact on campus local area network
Reliability over wide area network
Post-production capabilities
Support requirements
Streaming Tests
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Real Networks G-2
3CX
Cisco IPTV
Cam-Vision (MPEG II)
IBM Video Charger
FVC I -Studio
Quicktime
Microsoft Media Technology (ASF)
Hardware/Software Needs
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Network
Servers
User Workstations
Application set
Quality of Service (QoS)
• Ability to guarantee timely delivery of data
• Important in Video
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Video needs relatively large bandwidth
Can’t tolerate delay
Data loss effects video and audio
No time to resend
Need priority routing
IP - Internet Protocol
• PROS
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It’s “Everywhere”
Cheap
Well known
Flat Rate Pricing
(Usually)
• CONS
– No QoS
– Subject to information
loss
– Relies on public
network
Video Quality
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What quality is needed
Based on Bandwidth and QoS
Bandwidth = Quality
Frame rate
Picture size (pixels)
Picture quality
Compression = loss
Server Network
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Usually only part of network you control
Must support all streams individually
Private modem pool?
Intranet
Extra capacity needed
Transport Network
• Public networks
• Intranet
• Private
User Network (local ISP)
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POTS and modems
ISDN
DSL, Cable modems, etc.
Intranet
Acquisition
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Start with best quality
Live and/or for storage
Classroom feeds and Multimedia
Streaming speeds and formats must be
decided before acquisition
• Encoder Server/workstation
• Possible local temporary storage
• Send to archive storage by network
Storage
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Large amounts required
High speed access
Expandable disk arrays
Server(s) to manage storage access
Network
Post Production
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Adding links
Defining segments
Cataloging
Testing
Cataloging
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How to find the info one wants
Only full programs or clips within programs
With application or external database
Web and other access methods
Retrieval/Broadcast
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Security (who gets what)
Large delay on live feeds (20-30 seconds)
Streaming Server(s)
Network
Workstation software/hardware
Storage Requirements
• Low bandwidth less than 1 mb per minute
• High bandwidth 5 mb plus per minute
• TV Broadcast 45 mb per second