Streaming Video: Instructional Applications and Considerations

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Streaming Video Instructional Applications and
Considerations

• Faculty Development Institute
• Summer 2000

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The Quest for Scalable and Effective
Instructional Delivery Systems
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Streaming Video Project Objectives

• 1 Be on the cutting edge not the bleeding edge

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Streaming Video Defined

• One way compressed digital distribution
• Live or on demand
• Point-to-point
• Multicast

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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

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Streaming Video Project Objectives

• Campus
• Incorporate into class presentations
• Lecture review
• Out of class video assignments

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Streaming Video Project Objectives

• Continuing Education on-demand seminars
• Faculty and staff training
• University marketing

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Streaming Video Evaluations

• 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

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Streaming Tests

• Real Networks G-2
• 3CX
• Cisco IPTV
• Cam-Vision (MPEG II)
• IBM Video Charger
• FVC I -Studio
• Quicktime
• Microsoft Media Technology (ASF)

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Hardware/Software Needs

• Network
• Servers
• User Workstations
• Application set

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Quality of Service (QoS)

• Ability to guarantee timely delivery of data
• Important in Video
• Video needs relatively large bandwidth
• Cant tolerate delay
• Data loss effects video and audio
• No time to resend
• Need priority routing

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IP - Internet Protocol

• PROS
• Its Everywhere
• Cheap
• Well known
• Flat Rate Pricing (Usually)

• CONS
• No QoS
• Subject to information loss
• Relies on public network

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Video Quality

• What quality is needed
• Based on Bandwidth and QoS
• Bandwidth Quality
• Frame rate
• Picture size (pixels)
• Picture quality
• Compression loss

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Server Network

• Usually only part of network you control
• Must support all streams individually
• Private modem pool?
• Intranet
• Extra capacity needed

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Transport Network

• Public networks
• Intranet
• Private

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User Network (local ISP)

• POTS and modems
• ISDN
• DSL, Cable modems, etc.
• Intranet

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Acquisition

• 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

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Storage

• Large amounts required
• High speed access
• Expandable disk arrays
• Server(s) to manage storage access
• Network

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Post Production

• Adding links
• Defining segments
• Cataloging
• Testing

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Cataloging

• How to find the info one wants
• Only full programs or clips within programs
• With application or external database
• Web and other access methods

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Retrieval/Broadcast

• Security (who gets what)
• Large delay on live feeds (20-30 seconds)
• Streaming Server(s)
• Network
• Workstation software/hardware

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Storage Requirements

• Low bandwidth less than 1 mb per minute
• High bandwidth 5 mb plus per minute
• TV Broadcast 45 mb per second