streaming video
TRANSCRIPT
Streaming Video
Ira Goldstein
December 8, 2006
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Agenda
• Non Technical
• Streaming Defined
• Technologies
• Size/Bandwidth
• Content
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Streaming Video Defined
• Sequence of “moving images”• Via the Internet• Displayed by the viewer as it
arrives• Does not have to wait to download• Needs a player
– Can be either an integral part of a browser or downloaded software
• Usually lower than DVD quality
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Other Definitions
• Video on Demand (VoD)– Similar to streaming video
• Encoding – The process of preparing video for
streaming
• Broadband– High speed Internet connection
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Other Definitions (cont.)
• Resolution– The detail an image holds
• Pixel– Picture Element– Single point in a graphic image
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Technology
• RealSystem G2 from RealNetwork
• Microsoft Windows Media– NetShow Services– Theater Server
• Apple QuickTime
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Live or Memorex®?
• On Demand– Prerecorded
video– Catalog– Static– Pause-Rewind-
Fast Forward– Buffered
• Scheduled– Live or recorded– Broadcast– Multicast
• Sending the same stream to multiple users at the same time.
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Why Use Digital Media?
• Wealth of material– Libraries (Subscriptions)– News– Student Produced
• On demand– Teachable moment
• Increases use of resources
• Technology has matured
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Bandwidth Factors
• Mixed with “regular” traffic– Congestion and delays– T1 is not fast (Broadband)
• Resolution– Not Size– Can Zoom
• Frame Rate
• Number of users
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Bandwidth Factors
• Mixed with “regular” traffic– Congestion and delays– T1 is not fast (Broadband)
• Resolution– Not Size– Can Zoom
• Frame Rate
• Number of users
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640 x 480
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320 x 240
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160 x 120
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160 x 120 Zoomed
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640 x 480
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Bandwidth Factors
• Mixed with “regular” traffic– Congestion and delays– T1 is not fast (Broadband)
• Resolution– Not Size– Can Zoom
• Frame Rate
• Number of users
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Frame Rate
• Frames Per Second
• Flickering
• Smooth Motion
• 30 – 15 – 10
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Bandwidth Factors
• Mixed with “regular” traffic– Congestion and delays– T1 is not fast (Broadband)
• Resolution– Not Size– Can Zoom
• Frame Rate
• Number of users
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Number of Users
• Typical– 300k-400k per stream– Includes audio
• About 4 users on a T1
• Simultaneous Use
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Content
• PowerMedia Plus (Discovery)– www.powermediaplus.com
• United Streaming (Discovery)– www.unitedstreaming.com
• Digital Curriculum (Discovery) – www.digitalcurriculum.com
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Content (cont.)
• NASA TV– www.nasa.gov/multimedia/nasatv/
• National Geographic– video.nationalgeographic.com/video/
• Annenberg – www.learner.org/channel/
broadband/video.html
• ABC News– http://abcnews.go.com/Video/
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Demo
• Recorded– http://www.powermediaplus.com/pla
yer.asp?mediaID=11661
• Live– http://www.nasa.gov/multimedia/nas
atv/
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Questions & Answers
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