Keep SMILing

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    Keep SMILing - Presentation Transcript

    1. Keep SMILing Institutional Web Management Workshop 10 th June 2006 Adrian Stevenson Internet Services, University of Manchester
    2. Keep SMILing
      • What is SMIL?
      • How do you create a SMIL presentation?
      • Accessibility
      • Non-standard SMIL
      • Issues
      • References
    3. SMIL
      • W3C Specification
      • ‘ Synchronized Multimedia Integration Language’
      • “ … enables simple authoring of interactive audiovisual presentations”
      • SMIL presentations can integrate audio and video with images, text or many other media type
      • Syntax and structure similar to HTML
      • SMIL 2.1 released Dec 05
      • SMIL 1.0 released 1998
      • Examples
        • Customers, Suppliers and the Need for Partnerships – Stephen Emmott
        • State of the Web 2005 – Molly Holzschlag
    4. Creating a SMIL presentation
      • Record audio
      • Process audio
      • Create the image files
        • Assuming based on a Powerpoint presentation
      • Write SMIL code
      • Add accessibility features
      • Add other optional features
    5. Recording
      • Digital Recording device of some kind
        • Computer
          • Sound card
          • Microphone
          • Software – Audacity, Steinberg Wavelab
        • Mp3 player with recording capability
        • Professional audio device
      • Possible problems
        • Speaker moves about
        • High level of background noise
        • Interference
    6. Audio Processing
      • Slide change timings
      • Editing – pauses, coughs
      • Equalisation
      • Amplification
      • Pitch change
      • Volume Compression
      • Filtering
        • Noise reduction (Steinberg Cleanup)
      • File Compression (typically to mp3)
    7. Process Powerpoint slides
      • Export from Powerpoint
        • ‘ Save as’ PNG – every slide
        • Can look a bit messy:
        • http://www.ukoln.ac.uk/web-focus/events/workshops/trieste-2005/talk-2a/
      • Process image files in graphics program such as Macromedia Fireworks
    8. Write the SMIL Code
      • SMIL tag and namespace, head and body section
      • <smil xmlns=&quot;http://www.w3.org/2001/SMIL20/Language&quot;> <head> . ..optional section with all header markup... </head>
      • <body> . ..required section with all body markup... </body> </smil>
    9. <head> section
      • Defines appearance of the playback window
      • Simple layout:
      • <head>
      • <layout>
      • <root-layout height=&quot;450&quot; width=&quot;600&quot; background-color=&quot;black&quot;/>
      • <region id=&quot;main&quot; title=&quot;Main&quot; width=&quot;600&quot; height=&quot;450&quot; fit=&quot;fill&quot;/>
      • </layout>
      • </head>
    10. <body> section
      • Arrange the sequence and timing of elements.
      • Two basic tags are:
        • <par> plays media in simultaneously (in parallel)
        • <seq> plays media in sequence
      • Eg:
      • <body>
      • <par>
      • <audio src=&quot;intrometadata.mp3&quot; />
      • <img id=&quot;image_1&quot; src=&quot;Slide1.jpg&quot; region=&quot;main&quot; begin=&quot;0&quot; dur=&quot;5:02&quot; />
      • <img id=&quot;image_2&quot; src=&quot;Slide2.jpg&quot; region=&quot;main&quot; begin=&quot;5:02&quot; dur=&quot;59&quot; />
      • <img id=&quot;image_3&quot; src=&quot;Slide3.jpg&quot; region=&quot;main&quot; begin=&quot;6:01&quot; dur=&quot;26&quot; />
      • </par>
      • </body>
      • Example
    11. More SMIL code
      • <smil xmlns=&quot;http://www.w3.org/2001/SMIL20/Language&quot; xml:lang=&quot;en&quot;>
      • <head>
      • <layout>
      • <root-layout height=&quot;450&quot; width=&quot;750&quot; background-color=&quot;white&quot;/>
      • <region id=&quot;main&quot; title=&quot;Main&quot; width=&quot;600&quot; height=&quot;450&quot; fit=&quot;fill&quot;/>
      • <region id=&quot;nav&quot; title=&quot;Navigation&quot; width=&quot;150&quot; height=&quot;450&quot; left=&quot;600&quot;/>
      • </layout>
      • </head>
      • <body>
      • <par>
      • <audio src=&quot;emmott.mp3&quot; />
      • <img id=&quot;image_1&quot; src=&quot;Slide1.jpg&quot; region=&quot;main&quot; begin=&quot;0&quot;/>
      • <img id=&quot;image_2&quot; src=&quot;Slide2.jpg&quot; region=&quot;main&quot; begin=&quot;1:25&quot; />
      • <img id=&quot;image_3&quot; src=&quot;Slide3.jpg&quot; region=&quot;main&quot; begin=&quot;2:06&quot; />
      • <textstream src=&quot;nav.rt&quot; region=&quot;nav&quot; begin=&quot;0s&quot; />
      • </par>
      • </body>
      • </smil>
      Example
    12. Accessibility
      • ‘ alt’ and ‘longdesc’ text attributes
      • <body>
      • <par>
      • <audio src=&quot;emmott/emmott.mp3&quot; alt=“recording of a talk by Stephen Emmott called Customers, Suppliers, and the Need for Partnerships&quot; longdesc=&quot;emmott/emmott.txt&quot;/>
      • <img id=&quot;image_1&quot; src=&quot;emmott/Slide1.jpg&quot; region=&quot;main&quot; begin=&quot;0&quot; alt=&quot;Customers, Suppliers, and the Need for Partnerships title slide&quot;/>
      • <img id=&quot;image_2&quot; src=&quot;emmott/Slide2.jpg&quot; region=&quot;main&quot; begin=&quot;1:25&quot; alt=&quot;Copyright and credits slide&quot;/>
      • … .
    13. Accessibility
      • Captioning
        • Makes SMIL accessible to those with difficulty or who are unable to hear
        • SMIL audio track improves accessibility for those with visual impairments
        • Requires a transcription of the spoken content (plus any important non-spoken sound), and associated a timestamp
      • Add a textstream to the SMIL code:
        • <textstream src=&quot;emmott/transcript.rt&quot; region=&quot;text&quot; begin=&quot;0s&quot;/>
      • Example
    14. <switch>
      • SMIL <switch> tag allows the player to select from multiple options
      • E.g. different audio or text tracks based on user’s language preferences
      • Seven test attributes including:
        • System-language
        • System-bit-rate
      • <switch> selects the first item that matches the user’s system attributes
        • For selection based on connection speed, order the elements from highest to lowest speed
    15. <switch>
      • <switch>
      • <audio src=&quot;192k.mp3&quot; system-bitrate=192000&quot;/>
      • <audio src=&quot;128k.mp3&quot; system-bitrate=&quot;128000&quot;/>
      • <audio src=&quot;basic.mp3&quot; system-bitrate=&quot;28800&quot;/>
      • </switch>
      • <switch>
      • <audio src=&quot;french.mp3&quot; system-language=&quot;fr&quot;/>
      • <audio src=&quot;german.mp3&quot; system-language=&quot;de&quot;/>
      • <audio src=&quot;english.mp3&quot; system-language=&quot;en&quot;/>
      • </switch>
    16. More SMIL
      • Metadata
      • Hyperlink elements
        • <a href=&quot;http://www.apple.com/&quot; show=&quot;new&quot; >
        • <img src=&quot;poster.jpg&quot; region=&quot;r1&quot; dur=&quot;00:05&quot; />
        • </a>
      • Complex timing controls
      • Slide transition effects
        • Fade-in’s, Cross fades, Transparency
      • Zoom
      • Animation
      • Pre-fetch
    17. Non-standard SMIL
      • Real Player Navigation
        • Example
      • <textstream src=&quot;nav.rt&quot; region=&quot;nav&quot; begin=&quot;0s&quot; /> added to SMIL file
      • Textstream .rt file:
        • <window>
        • <time begin=&quot;0:00.0&quot;/>
        • <clear/>
        • <p>Menu</p>
        • <a href=&quot;command:seek(0:0)&quot; target=&quot;_player&quot;>Introduction</a><br/>
        • <a href=&quot;command:seek(1:25)&quot; target=&quot;_player&quot;>Copyright and credits</a><br/>
        • ……
        • </window>
    18. Issues
      • Technical Issues
        • File path problem
        • Users have different SMIL players (or no SMIL player)
          • Mixed media problem
        • Difficult to capture complex elements of a presentation
        • No control over users audio and video settings
        • Large files sizes
      • Non-Technical Issues
        • Time consuming
        • IPR
    19. Some references
      • W3C SMIL Page http://www.w3.org/AudioVideo/
      • W3C Accessibility Features of SMIL http://www.w3.org/TR/SMIL-access/
      • Synchronized Multimedia On The Web - Larry Bouthillier http://www.webtechniques.com/archives/1998/09/bouthillier/
      • SMIL Scripting for Quicktime http://developer.apple.com/documentation/quicktime/Conceptual/QTScripting_SMIL/index.html
      • SMIL del.icio.us http://del.icio.us/bias/SMIL

    + Adrian StevensonAdrian Stevenson, 3 years ago

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