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Media Streaming
 

Media Streaming

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    Media Streaming Media Streaming Presentation Transcript

    • Media Streaming 12
    • What is Streaming Media?
      • The delivery of audio/video/data between a server and a client (user), as a continuous digital stream
      • Eliminates waiting for an entire file to download
      • Content is converted to digital files sent over the internet as data packets.
      • Playback begins as soon as first packets arrive or as requested by the end user
      • No impact on end-user’s computer
      • Leading architectures: RealMedia, Windows Media, QuickTime
    • It’s a Challenge
      • Uncompressed digital video produces data at the rate of 27 MB/sec (1.6 GB/min)
      • A challenge to store
      • A challenge to transport
    • Factors in Architecture Selection
    • Streaming Media Formats
      • Major player formats
        • Real Networks
          • Real Media Player – RM
        • Microsoft
          • Windows Media Player – WMV
        • Apple
          • Quicktime Player – MOV
      • Other formats
          • Audio downloads – MP3
          • Capture and editing - AVI
          • Flash and animation - SWF
          • CD audio playback – CDA, WAV
    • Things to Consider
      • Identify your user audience
        • Player compatibility
          • Are they using PC or Mac
          • Offices, Dorms, Computer Labs, Homes
          • Wireless and other mobile devices
        • Internet Connection
          • Low speed – 28kbps to 80kbps
          • High speed – 80kbps to 300kbps
          • Broadband – 300kbps to 1.0mbps
        • Audience members
          • Staff, Dept. Admins, Managers, Directors
          • Anonymous users on WWW
    • Things to Consider
        • Media delivery
          • On-Demand
          • Live Webcasting
          • CD-ROM, DVD
        • Network
          • User connectivity
          • Firewalls, multicast enabled routers
        • Other
          • Password restrictions
          • E-Commerce
          • Media reports on viewer usage
    • On-Demand content and live broadcasts
      • Streams on demand
        • File-based Streaming
        • Available to users at any time, and are sent on demand.
      • Live Streaming
        • Live broadcast event
        • Encoder…
    • Streaming Media Options
      • Encoding
        • Choosing a format
          • Real Media
          • Windows Media
          • Quicktime
        • Determine a window size
        • (Width x Height in pixels)
          • 160x120
          • 240x180
          • 320x240
          • Even larger
    • Streaming Media Options
      • Encoding
        • Bitrate selection
          • Single rate - 28k, 56k, 120k, 200k, 400k
            • One stream per bitrate
            • One encoded file for each user’s connect speed
            • One URL for each connect speed
          • Multirate – (28k-56k-200k)
            • Real - SureStream
            • Windows - Intelligent Stream
            • Quicktime - Alternate Movies
            • One encoded file can reach multiple connect speeds
            • Server finds optimum connect speed and adjusts as network bandwidth usage changes
            • Only one url needed for all connect speeds
            • Larger file size for archive media
    • Streaming Media Options
      • Authoring
        • Include powerpoint slides sync’d to video
        • Insert graphics, images, logos
        • Add URL links to other sites or content
        • Create a URL to play only parts of the media
        • Create a playlist within one URL to stream multiple clips or media files
        • Set player commands, end-user controls
        • Pop-up or embedded player
    • Streaming Media Options
      • Indexing
        • Assign keyframes to your content media
        • Allows you to create smaller segments of your media and store them as clips
        • Add keywords to clips for users to search your media from a website
        • Convert speech, closed captioning and ppt slides to text for searching
        • Save clips in a playlist and share them with other users
    • Streaming Media Options
      • Webcasting
        • Live presentations over the internet
        • One multicast stream to many users
        • Include powerpoint or other rich media
      • Hosting
        • On demand playback of archived media
        • Multiple streaming server platforms
        • Unlimited streams
        • Low storage costs
        • No impact on your own network
        • No hardware resources to maintain
    • Combining Media Limitations
      • Web browsers are not designed to fully support multimedia features
      • Limited coordination of media elements
    • The Problem
      • Lots of Bits
        • Images, audio and video are beyond Internet design specs
        • Results in space/ time constraints at:
          • the server
          • the network( s)
          • the client
      • Not All Bits are Equally Important
        • Time between samples often more important than bits in sample,
        • for example lip synchronization (but not always...)
      • Content may be Distributed Across Network
        • Need to synchronize presentation
      • Objectives
        • Add synchronization to the Web
        • Allow interoperability
        • Use declarative format, preferably text — thus XML
    • Solution
      • Use of a single timeline for all media
      • Creation of time-based multimedia delivery over the web
      • Synchronization
      • Coordination
    • What Is SMIL?
      • SMIL stands for Synchronized Multimedia Integration Language
      • SMIL is pronounced "smile"
      • SMIL is a language for describing audiovisual presentations
      • SMIL is easy to learn and understand
      • SMIL is an HTML-like language
      • SMIL is written in XML
      • SMIL presentations can be written using a text-editor
      • SMIL is a W3C standard
        • SMIL 2.0 August 2001
        • http://www.w3.org/TR/smil20/
    • What Is SMIL?
    • A Simplified SMIL Example
      • <smil>
      • <body>
      • <seq repeatCount=&quot;indefinite&quot;>
      • <img src=&quot;image1.jpg&quot; dur=&quot;3s&quot; />
      • <img src=&quot;image2.jpg&quot; dur=&quot;3s&quot; />
      • </seq>
      • </body>
      • </smil>
    • What Can SMIL Do?
      • SMIL can be used to create Internet or Intranet presentations
      • SMIL can be used to create slide show presentations
      • SMIL has been described as the Internet answer to PowerPoint
      • SMIL presentations can display multiple file types (text, video, audio...)
      • SMIL presentations can display multiple files at the same time
      • SMIL presentations can display files from multiple web servers
      • SMIL presentations can contain links to other SMIL presentations
      • SMIL presentations can contain control buttons (stop, start, next, ...)
      • SMIL has functions for defining sequences and duration of elements
      • SMIL has functions for defining position and visibility of elements
    • SMIL Files
      • A SMIL file contains all the information necessary to describe a multimedia presentation
      • SMIL files are stored with the extension *.smil
      • A SMIL file contains the following:
        • The layout of the presentation
        • The timeline of the presentation
        • The source of all multimedia elements
    • How to Play a SMIL File?
      • You will need a SMIL player. Different SMIL players can be found
        • RealOne Platform by RealNetworks has full support for SMIL 2.0
        • SMIL Player by InterObject supports the SMIL 2.0 Basic Profile
      • With Internet Explorer 5.5 or later, SMIL elements can be inserted into HTML files
      • This way any SMIL presentation can run over the Internet as standard HTML files
    • SMIL in HTML
      • Adding References
        • Adding a &quot;time&quot; namespace definition to the <html> tag
        • Adding an <?import> element to import the &quot;time&quot; namespace
        • Adding a <style> element to define the class &quot;time&quot;
      <html xmlns:time=&quot;urn:schemas-microsoft-com:time&quot;> <head> <?import namespace=&quot;time&quot; implementation=&quot;#default#time2&quot;> <style>.time {behavior: url(#default#time2)}</style> </head> <body> <time:seq repeatCount=&quot;indefinite&quot;> <img class=&quot;time&quot; src=&quot;image1.jpg&quot; dur=&quot;3s&quot; /> <img class=&quot;time&quot; src=&quot;image2.jpg&quot; dur=&quot;3s&quot; /> </time:seq> </body> </html>
    • SMIL Timing
      • time formats:
        • hh:mm:ss.f
        • number [h|min|s|ms]
        • wallclock (YYY-MM-DDThh:mm:ss+zone)
      • Duration
        • The duration ( dur =&quot;5s&quot;) attribute
      • When To Start?
        • The begin ( begin =&quot;2s&quot;) attribute
    • SMIL Sequence
      • <seq> - the most common SMIL element - defines a sequence
      • The <seq> element can have a number of attributes:
        • begin, dur, repeatCount
      <html xmlns:t=&quot;urn:schemas-microsoft-com:time&quot;> <head> <?import namespace=&quot;t&quot; implementation=&quot;#default#time2&quot;> <style>.t {behavior: url(#default#time2)}</style> </head> <body> <t:seq repeatCount=&quot;indefinite&quot;> <h2 class=&quot;t&quot; dur=&quot;1s&quot;> I will display for one second</h2> <h2 class=&quot;t&quot; dur=&quot;2s&quot;> I will display for two seconds</h2> <h2 class=&quot;t&quot; dur=&quot;3s&quot;> I will display for three seconds</h2> </t:seq> </body> </html>
    • SMIL in Parallel
      • Objects inside the <par> element will be played at the same time
        • Attributes: begin , dur , endsync = &quot;first&quot;|&quot;last&quot;|id(clip), repeatCount
      <html xmlns:t=&quot;urn:schemas-microsoft-com:time&quot;> <head> <?import namespace=&quot;t&quot; implementation=&quot;#default#time2&quot;> <style>.t {behavior: url(#default#time2)}</style> </head> <body> <par> <t:audio src=&quot;liar.wav&quot; repeatCount=&quot;indefinite&quot; type=&quot;wav&quot; /> <t:seq repeatCount=&quot;indefinite&quot;> <h2 class=&quot;t&quot; dur=&quot;1s&quot;> I will display for one second</h2> <h2 class=&quot;t&quot; dur=&quot;2s&quot;> I will display for two seconds</h2> </t:seq> </par> </body> </html>
    • SMIL Transitions
      • IE 6 supports transitions based on the SMIL 2.0. Transitions are implemented with the element <transitionfilter>
        • Attributes: type, begin, mode, from, to
      • Transition Filters
        • fade, barnDoorWipe, barWipe, clockWipe, ellipseWipe, fanWipe, irisWipe, pushWipe, slideWipe, snakeWipe, spiralWipe, starWipe
      <t:transitionfilter targetelement=&quot;keyb&quot; type=&quot;clockWipe&quot; begin=&quot;keyb.begin&quot; dur=&quot;2s&quot; /> <img id=&quot;keyb&quot; class=&quot;t&quot; src=&quot;pic_keyb.jpg&quot; dur=&quot;4s&quot; width=&quot;128&quot; height=&quot;107&quot; />
    • SMIL Media Elements
      • <animation> <audio> <brush> <img> <param> <ref> <text> <textstream> <video>
      • Attributes: erase src type
      <html xmlns:t=&quot;urn:schemas-microsoft-com:time&quot;> <head> <?import namespace=&quot;t&quot; implementation=&quot;#default#time2&quot;> </head> <body> <t:video src=&quot;http://www.ananova.com/about/vap_windows_check.wmv&quot; repeatCount=&quot;indefinite&quot; type=&quot;wmv&quot; /> </body> </html>