Multimedia Network Networking Issues

Knowledge assumed prior to starting this module

TCP streams are decomposed into packets for sending
UDP is unreliable
When packets are sent from one host to another the amount of time for the packet to arrive will vary, sometimes significantly. Packets may also be lost, which in the case of TCP means that data will be retransmitted and a delay will result.
The concept of buffering
Knowledge and understanding surrounding bandwidth and latency.

To be able to compare and contrast the delivery and playback requirements between
- Complete download and play
- Streaming of stored media (e.g. a movie or song)
- Live media (e.g. live sporting event or radio broadcast)
- Real-time interactive media stream (e.g. Video or telephone call)
Issues associated with streaming of data
- lost or late data
- playing back at the proper rate

Controlling the stream (i.e. starting stopping positioning)
Requirements of the stream, i.e how timestamps and sequence numbers are used to ensure proper playback
Handling lost or out of order data

Pre-class Activities
- Invention exercise - design a streaming protocol to handle playback
In Class Activities
Post Class Activities

Multimedia streaming assignment from Kurose and Ross The multimedia chapter of Kurose and Ross (Chapter 7 in 4th edition) has a programming assignment that uses RTP and RTSP. The text directs one to a website for the full assignment and supporting materials but I wasn't able to find them. However, the link at the start of this bullet has them. (In cast the above website disappears, I have "archived" its contents in the file RTP.tar.gz.
RFC 4566 SDP - Session description protocol.
Java Media Framework
SIP - Session Initiation Protocol
H.323 - ITU 323 incorporates both call signal and multimedia transport on packet switched networks
- H.323 on Wikipedia
- T-REC-H.323-200912-IPDF-E.pdf copied from the ITU. Additional information can be found at: http://www.itu.int/rec/T-REC-H.323/en/
RTSP - Real time streaming protocol - Protocol between client and server that controls the streaming of the multimedia data, but it does not specify how the multimedia is actually streamed, that is handled by a different protocol. Typically RTP.
RTP - Realtime Transport Protocol - A protocol that specifies the packet format and semantics of sending/receiving streaming multimedia data on an IP network

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
gz	RTP.tar.gz	r1	manage	41.4 K	2011-06-24 - 00:28	DonaldActon	Multimedia RTP assignment
pdf	T-REC-H.323-200912-IPDF-E.pdf	r1	manage	3759.3 K	2011-06-24 - 18:24	TWikiGuest	ITU H.323 Recommendation

Topic revision: r9 - 2011-06-25 - DonaldActon