VOD Video On Demand

1
VOD - Video On Demand

• Users can request a video and watch immediately
• Motion video most common
• Levels of interaction can vary
• Protocols/formats not specified
• Servers can be public or private

2
VOD - Examples

• VOD can be used in a number of applications
• Movie rental / purchase
• News / Tv-shows
• Education and distance learning

3
Comparision with Pay-Per-View

• VOD can offer a wider choice of movies to be
  viewed at any time, while PPV typically is
  broadcasted at scheduled times.
• PPV has lower costs of distribution, since each
  user doesn't require a unique stream.

4
Comparision with VHS-rental

• VOD doesn't require any physical exercise, and is
  delivered instantly.
• VOD can only offer the same controlls as VHS if
  each user have an unique stream.
• Random jumps to scenes can then be made
  instantly.
• VOD isn't limited to VHS's low quality.
• VHS doesn't rely on a server, but on the
  rentalshop.

5
Examples of usage

• Most news sites offers short videoclips, a kind
  of VOD.
• The popular movie-swapping between friends can be
  seen as VOD.
• Some universities record and store lectures to
  make them publicly available, for instance LTU.

6
Structure of centralized system
ISP internal network
7
Conclusion

• Very convenient solution for the end user.
• As of today it requires expensive resources and a
  fast and reliable network.
• Prices have to be kept down.
• VOD is growing more and more each day, but havn't
  had it's big breakthrough yet.