Web Multimedia
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Web Multimedia






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    Web Multimedia Web Multimedia Presentation Transcript

      • It’s as large as life,
      • and twice as natural!
      • - Lewis Caroll, Through the Looking-Glass
      • Multimedia is simply multiple forms of media integrated together. Media can be text, graphics, audio, animation, video, data, etc. An example of multimedia is a web page on the topic of Mozart that has text regarding the composer along with an audio file of some of his music and can even include a video of his music being played in a hall.
      • To make the presentation as natural-looking as possible by combining text, graphics, sound, animation and video in a meaningful way.
      • Because multimedia enables us to learn in a real world context.
      • Because multimedia allows us to
      • tailor our learning.
      • Because multimedia technologies
      • eliminate communication barriers.
        • Like multimedia
        • Hate waiting
        • Hate obsolete formats
        • Find it a hurdle to download and install plug-ins
      • Don’t stream lengthy media
      • Don’t simply translate analog to digital
      • Use text and media sparingly
      • Tailor your content for web delivery
      • If you can, use:
              • Audio only
              • Slide shows, or
              • Video
      • A good way to deliver multimedia
      • Audio synchronized with still images
      • Slideshows can be turned into video
      • Still images with sound compresses better than video
      • Movie frame rate can be low
      • Can devote more data to image quality and size
      • Most challenging medium
      • Uncompressed video is too heavy
          • 1 second NTSC video = 27MB
      • Scaling and compression needed
      • High compression = poor quality video
      • Shoot close-ups – they compress efficiently and look good at low resolution and frame rates
      • Lack interface controls
      • No easy way to stop looping animation
      • Lack means to replay non-looping animation
      • Do not perform interframe compression
      • Acts as a distraction
      • Disrupt users’ concentration from primary contents
      • Simple animation on website’s main page
      • Right amount of visual interest
      • Non-distracting from primary contents
      • Subtle animation – rollover, mouseover
      • Useful to illustrate concepts and procedures
      • Animation preferably on a secondary window to minimize distraction
      • Files should be small enough to be accessible to broadest possible audience
      • Sufficient quality to be worth the effort
      • Balance quality against accessibility
      • Know characteristics of different media
      • Know limitations of delivering media
      • Be ready to compromise
      • Characteristics of analog source
        • CD-quality audio = 44.1 KHz
        • Sound = 16-bit stereo
        • Video = 640 x 480 pixels
        • Frame rate = 30 frames per second (fps)
        • Full capture needs enormous amounts of disk storage
      • Eliminates redundant data
      • Removes less important data to shrink file further
      • Uses algorithms or “codecs” which handle compression and decompression when played
      • Codecs use lossy compression
      • Multiple compression = low video quality
      • Continuous sending of data to user
      • Entire file is not downloaded
      • Content stored in media server which determines client’s data capacity
      • Server adjusts data streaming accordingly and sends just enough data to the client