Podcasting & SMIL
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Podcasting & SMIL



Given at ALT-C 2006 with Brian Kelly and Scott Wilson

Given at ALT-C 2006 with Brian Kelly and Scott Wilson



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Podcasting & SMIL Podcasting & SMIL Presentation Transcript

  • Podcasting & SMIL
    • ALT-C 2006
    • Adrian Stevenson
    • Internet Services
    • University of Manchester
          • Some slides in this presentation are based on original presentations produced by the JISC-funded QA Focus project provided by UKOLN and AHDS
  • RSS
    • What is RSS?
      • “ RSS is a format for syndicating news and the content of news-like sites, including major news sites like Wired, news-oriented community sites like Slashdot, and personal weblogs” – from xml.com
    • What does RSS stand for?
      • Several different views:
        • Netscape called it Rich Site Summary (v 0.92)
        • W3C felt it should be based on RDF/XML to provide extensibility and called it RDF Site Summary (v 1.0)
        • Dave Winer (& others) valued its simplicity and developed an alternative called Really Simple Syndication (v 2.0)
  • RSS Viewers
    • Ways of accessing RSS feeds:
      • Blog – eg. bloglines
      • Web pages
      • Bookmark interfaces –Mozilla Firefox ‘live’ bookmarks
      • Browser plug-ins - Sage
      • Email clients - Outlook Express, Mozilla Thunderbird
      • Mobile Phone
  • Podcasting - What is it?
    • RSS and Podcasting:
      • Podcasting is an application of RSS 2.0:
        • It is simply the syndication of audio, typically mp3 files, instead of text (RSS news feeds)
        • You can schedule the download of the mp3 files and listen to them offline e.g. on a portable mp3 player such as an Apple iPod
      • Very easy for the end user and relatively easy for the publisher
      • Can be difficult to do well –it helps to have some sound recording skills
    • Many Podcast directories http://www.podcastalley.com/ , BBC
  • Accessing a Podcast
    • To access a Podcast:
    • Install Podcast software e.g. iTunes, Juice, Jager, Blogmatrix, …
    • Add the URL of RSS file to the podcast software
      • IWMW 2006
      • BBC Film reviews
    • Various configuration options are usually available
      • Scheduling for downloads
      • The download location of mp3 file
    • Transfer files to portable mp3 player such as an iPod (using e.g. iTunes, Winamp)
  • Podcasting and [e-]Learning
    • The University of Bath provides a highly-regarded e-learning Blog, Auricle
      • http://www.bath.ac.uk/dacs/cdntl/pMachine/morriblog.php
    • Auricle has now added some Podcasts:
      • Skype interviews
    • Stanford ITunes very successful
    • However, Podcasting still fairly new to HE sector
  • Creating a Podcast
    • Make the recording:
      • Eg. Using audio recording software e.g. Audacity
      • Best to use good quality microphone and a PC
      • Recording usually delivered as mp3 file
    • Upload the recording to a web server and create an RSS file for the recording
    • Possible problems
      • Speaker moves about
      • High level of background noise
      • Interference
  • Audio Processing
    • Editing – pauses, coughs
    • Equalisation
    • Amplification - normalisation
    • Pitch change
    • Volume Compression
    • Filtering
      • Noise reduction (Steinberg Cleanup)
    • File Compression (typically to mp3)
  • Creating a Podcast (2)
    • Early adopters approach – copy & edit an existing RSS file
    <item> <title>Podcast 1 For IWMW 2006</title> <link>http://www.ukoln.ac.uk/…podcasts/podcast-iwmw-2006-01.mp3</link> <guid>http://www.ukoln.ac.uk/…/ podcasts/#podcast-01</guid> <description>This introductory Podcast describes what a Podcast is and …. ( 2.5 minute long MP3 recording, ~1.6 MB).</description> <enclosure url=&quot;http://www.ukoln.ac.uk/ …/podcasts/podcast-iwmw-2005-01.mp3&quot; length=&quot;1575770&quot; type=&quot;audio/mpeg&quot;/> <pubDate>Sun, 12 Jun 2006 ...</pubDate> </item> <channel> <title>IWMW 2006 Podcasts</title> <link>http://www.ukoln.ac.uk/web-focus/events/podcasts/podcasts.xml </link> <description>Podcasts About IWMW 2006</description> <language>en-gb</language> <copyright>Creative Commons - Attribution and Share-alike</copyright> <pubDate>Wed, 15 Jun 2006 10:00:00 GMT</pubDate>
  • Creating a Podcast (3)
    • Some software now available
  • Podcasting Usage Scenarios
    • Podcasting is not a replacement for the ‘real thing’ – the live lecture theatre experience
    • But it means you can …
      • access lectures, conference presentations etc. after the event – Stanford ITunes. Some examples now in the UK.
      • Provide some support in case of problems (e.g. couldn't attend talk), conflicts (parallel sessions), …
      • Provide a 'taster', helps in marketing, addresses additional areas (e.g. social activities), …
      • Keep informed of developments elsewhere
  • SMIL
    • W3C Specification
      • ‘ Synchronized Multimedia Integration Language’
    • SMIL presentations can integrate audio and video with images, text or 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
  • Creating a SMIL presentation
    • Record and process audio
    • Create the image files
      • Assuming based on a Powerpoint presentation
    • Write SMIL code
    • Make SMIL code accessible
    • Add other optional features
  • 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
  • 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 Demo
  • 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;/>
    • … .
  • 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
  • Issues
    • Technical Issues
      • Not many SMIL editors
      • Audio recording quality
      • Users have different SMIL players (or no SMIL player)
        • Mixed media problem
      • Difficult to capture complex elements of a presentation
      • No control over a users audio and video settings
      • Large files sizes (can be solved by streaming)
    • Non-Technical Issues
      • Time consuming – Flash and Quicktime easier?
      • IPR
  • SMIL Usage Scenarios
    • A SMIL presentation is not a replacement for the ‘real thing’ – the live lecture theatre experience
    • But it means you can …
      • access lectures, conference presentations etc. after the event – eg. IWMW and this ALT-C workshop today
      • Provide some support in case of problems (e.g. couldn't attend talk), conflicts (parallel sessions), …
      • Provide a 'taster', helps in marketing, addresses additional areas (e.g. social activities), …
  • 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