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Multimedia in Web

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Flash. Viewer Capacity Consideration. Bandwidth. Speed test at http://sea. ... Plug-Ins: e.g. Flash Player. Browser. Experience. Find types of images used ... – PowerPoint PPT presentation

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Title: Multimedia in Web


1
Multimedia in Web
  • Introduction

2
Multimedia Elements in Web Page
  • Images
  • Voice
  • Music
  • Animation
  • Video
  • Text Numbers

3
Digitalization
  • Contents ? Numbers (0s 1s)
  • For computers and the Internet
  • Different media originated and developed
    differently, e.g. sound image ? Different
    formats
  • Accessibility http//www.w3c.org/WAI/

4
Pixels
  • Picture element
  • Values in color and brightness

5
Role of Bandwidth
  • Volume of data can transmit in one second
  • 56K (Dial-up)
  • ISDN 128 Kbits/sec
  • DSL and Cable (Broadband) 512 Kbits/sec
  • T1 1.5 Mbits/sec
  • Ethernet 10-100 Mbits/sec

6
Data Compression
  • Digitalization ? Compression ? Decompression
  • Codecs Compression Decompression
  • Removing repetition
  • e.g. 405 405 405 405 405 ? 405 X 5

7
  • Averaging e.g. 378 379 378 376 ? 378 X 4
  • Range Reduction e.g. 8 bit (256) ? 6 bit (64)
  • Sound loudness can be expressed in 256 levels
    or 64 levels.

8
File Formats
  • Images
  • GIF
  • JPEG
  • PNG
  • Sound
  • AIF (Audio Interchange File)
  • QuickTime

9
  • Video
  • QuickTime (mov)
  • Window Media
  • RealVideo
  • Animation
  • Flash

10
Viewer Capacity Consideration
  • Bandwidth
  • Speed test at http//sea.speakeasy.net/
  • Screen size resolution
  • 640 X 480 pixel screen
  • Processor
  • Video System, Ram, BUS
  • Firewall
  • Plug-Ins e.g. Flash Player
  • Browser

11
Experience
  • Find types of images used
  • Go to http//www.moma.org/
  • Right-click on images ? Properties
  • Movies
  • http//www.atomfilms.com/
  • http//www.ifilm.com/
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