Internet, the World Wide Web and Issues in Delivering Multimedia Content on the Net

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Internet, the World Wide Web and Issues in
Delivering Multimedia Content on the Net
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Background

• Internet was born 1960s
• US DoD, create a non-centralized network designed
  to survive partial nuclear war and still function
  when parts of the network were down or destroyed
• ARPANET (Advanced Research Projects Agency
  Network) with the aim of providing a secure and
  survivable communications network for
  organizations engaged in defense-related research

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Background

• 1969, first attempted to implement a long
  distance networked computers
• 4 computers linked by 50Kbp circuits
• UCLA
• Stanford Research Institute (SRI)
• UC Santa Barbara
• University of Utah in Salt Lake City
• Telephone connection

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Background

• Standard protocols IP (Internet Protocol)
• 1977 TCP/IP (Transmission Control Protocol /
  Internet Protocol)
• Allowed users to link various branches of other
  complex networks directly to the ARPANet, which
  soon came to be called the Internet
• MiliNet (dedicated to military research
  establishment) and dropped the ARPAnet
• ARPAnet grew, 1985 National Science Foundation
  (NSF) establish Internet access across the United
  States

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Background

• Internet global network of computers connected
  together using the TCP/IP technology
• Web (Encyclopedia Britannica 2002)
• WWW, (byname THE WEB), is the leading
  information retrieval service of the Internet
  (the worldwide computer network). The Web gives
  users access to a vast array of documents that
  are connected to each other by means of hypertext
  or hypermedia links-i.e. Hyperlinks, electronic
  connections that link related pieces of
  information in order to allow a user easy access
  to them

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Background

• How multimedia could help in utilizing the
  Internet
• Global exchanges of information, which could
  contain media rich, content, i.e. electronic
  mails enhanced by audio and video and
• Creation of new environments for business,
  education, entertainment and delivery of news of
  information.

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Delivering Multimedia Content on the Web

• Content of Internet has transformed form
  text-based environment to graphics, animation,
  audio and video
• Graphics format used GIF, JPEG and GIF
• Streaming technology and compression techniques
  help speed up the download time

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Audio and Video Streaming

• The audio file is broken up into small pieces
  (streams) and then sent from the sever to the
  clients machine
• Browser on the clients machine uses a helper
  application (like RealAudio) to re-assemble the
  audio stream
• Advantage
• No waiting time (or very little) from the time
  the mouse is clicked until the time the sound
  start playing
• RealAudio producer to broken the audio file into
  streams ready for broadcasting over the Internet

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Compression

• Audio
• MIDI
• A musical score, such as notes and what
  instrument will play these notes
• MPEG (MP3)
• Deletes the redundant information that human
  hearing could not pick up, reducing the file size
  up to 12 times
• Video
• MPEG
• Remove spatial redundancy within the video frame
  and temporal redundancy between frame

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SMIL

• The Synchronised Multimedia Integrated Language
  (SMIL, pronounced smile) enables simple
  authoring of interactive audiovisual
  presentations. SMIL is typically used for rich
  media / multimedia presentations which integrate
  streaming audio and video with images, text or
  any other media type. SMIL is an easy-to-learn
  HTML-like language, and many SMIL presentations
  are written using a simple text-editor W3C
• XML-based language that allows control over the
  what , where, and when of media elements in a
  multimedia presentation.

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SMIL

• Functionality
• Timing
• Time manipulations
• Animation
• Content control
• Layout
• Linking
• Media objects
• Meta information
• Structure and
• transitions

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SMIL

• mechanism used to enable the clients
  browser to make informed decision about the
  presentation
• To check the internet connection of a client
• Tutorial
• http//www.helio.org/products/smil/tutorial/

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Mobile Multimedia Technology

• Emergence of multimedia computer systems
  integrated into the telecommunications and
  networking infrastructures and offer access to
  services and applications using combinations of
  data, text, voice, video to anybody, anytime,
  anywhere
• 1980s Advanced Mobile Phone Systems
• First generation of cellular systems in U.S.
• Speech transmission
• NMT (Nordic Mobile Telephone System)
• Europe, use FM Modulation

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Mobile Multimedia Technology

• GSM (Global System for Mobile Communications)
• 2nd generation of mobile communication
• 13.8kbps
• Based on circuit switching
• Once the connection established, the user has the
  exclusive access to certain amount of bandwidth
  until the connection terminates
• Voice calls, send and receive data
• 2.5G, improved data capabilities, and
  always-on-connection

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Mobile Multimedia Technology

• i-mode
• NTTDoCoMo largest cellular operator inJapan
• Wireless technology offering wireless web
  browsing and email from mobile phones
• Access internet via their wireless phones
• Based on packet data transmission

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Mobile Multimedia Technology

• 3rd generation (2005)
• Higher data rates (Mbps) intended for
  applications other than voice such as mobile
  games
• Support full-motion video, video conferencing and
  advanced data services with full Internet access
• Universal Mobile Technology Services (UMTS), 2Mbps

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Mobile Multimedia Technology

• Bluetooth
• A short-range radio technology designed to
  simplify peer-to-peer connectivity
• Enables mobile phones, printers, PCs and PDAs to
  communicate directly with each other at high
  speeds without the need for a network server or
  cables
• Uses radio transmission, transfers voice and data
  in real time
• Operates in the 2.4Ghz frequency band (problem in
  France!)

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Mobile Multimedia Technology

• Application areas
• M(Mobile)-commerce shopping, ticket purchases,
  reservations, and comparison shopping
• Finance statements, funds transfer, and shares
  trading
• M-billing notification, presentation, and
  payment of bills
• Enterprise Access inventory, shipment/sales
  updates, and email access
• M-care customer service, payment status, and
  other backroom operations
• Entertainment games, gambling, and interactive
  multi-player events
• Messaging communication and collaboration
• Traveling scheduling, reservations and advisories

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