This document outlines different classes of multimedia applications including streaming stored audio and video, streaming live audio and video, and real-time interactive audio and video. It discusses key differences compared to classic applications, noting multimedia is highly delay-sensitive but can be loss-tolerant. Each application class has different constraints around initial request to display start times and ensuring continuous playback. The document also provides an outline to cover multimedia protocols, accessing data through web servers, and conclusions.

20. Class: Streaming Stored Audio andClass: Streaming Stored Audio and
VideoVideo
The multimedia content has been prerecorded
and stored on a server
User may pause, rewind, forward, etc…
The time between the initial request and display
start can be 1 to 10 seconds
Constraint: after display start, the playout
must be continuous

21. Class: Streaming Live Audio andClass: Streaming Live Audio and
VideoVideo
Similar to traditional broadcast TV/radio, but
delivery on the Internet
Non-interactive just view/listen
◦ Can not pause or rewind
Often combined with multicast
The time between the initial request and display
start can be up to 10 seconds
Constraint: like stored streaming, after display
start, the playout must be continuous

22. Class: Real-Time Interactive AudioClass: Real-Time Interactive Audio
and Videoand Video
Phone conversation/Video conferencing
Constraint: delay between initial request and
display start must be small
◦ Video: <150 ms acceptable
◦ Audio: <150 ms not perceived, <400 ms acceptable
Constraint: after display start, the playout
must be continuous

23. Class: OthersClass: Others
Multimedia sharing applications
◦ Download-and-then-play applications
◦ E.g. Napster, Gnutella, Freenet
Distance learning applications
◦ Coordinate video, audio and data
◦ Typically distributed on CDs

24. Difference with classic applicationsDifference with classic applications
Highly delay-sensitive
◦ Packets are useless if they arrive too late
Loss-tolerant (for the most part)
◦ Packet loss can be concealed

25. OutlinesOutlines
Difference with classic applicationsDifference with classic applications
Classes of multimedia applications
◦ Requirements/Constraints
Problems with today’s Internet and solutions
Common multimedia protocols
◦ RTP, RTCP
Accessing multimedia data through a web
server
Conclusion

26. Thank You