Multimedia networking is highly important since we are witnessing massive development of audio and video applications over the Internet. The service requirements of multimedia applications differ significantly from those of traditional elastic applications such as e-mail, web browsing, and file downloading. In particular, unlike the elastic applications, multimedia applications are highly sensitive to end-to-end delay and delay variation but can tolerate occasional loss of data. So it is delay-sensitive loss-tolerant applications.
One the most famous streaming classes is streaming stored videos, like the idea of YouTube. In this class, the multimedia content is stored at the server. The term streaming means that the video doesn't have to be completely received so the receiver can play it, instead the client can start playing the video without receiving the whole file.(remember YouTube).
In order to communicate between client and server, RTSP is used to communicate between them. RSTP is public domain protocol for providing user connectivity.
On the Video above, We'll experiment with Video Streaming (Streaming Online Channel TV) over the Internet for discuss RTSP protocol in the following section.
- TCP/UDP Port Numbers : IANA port assignments Service Name and Transport Protocol Port Number Registry For Real Time Streaming Protocol (RTSP)
- "Playback Statistics" to see the network output bandwidth and packet loss rate. bandwidth and packets, respectively. The bandwidth panel illustrates how does the network bandwidth varies in time, whereas the “packets” panel provides information about packet losses. The bandwidth refers to the instantaneous total data rate received at the player.
The lost packet ratio indicates the percentage of packets sent by the server that did not reach the destination, and the late packet ratio specifies the percentage of packets that arrived at the client later than its scheduled play-out time. The RealServer and RealPlayer allow retransmission of lost packets. The “packets” panel also shows the statistics about retransmission. Record the minimum, maximum, and average bandwidth, lost packet ratio, late packet ratio, and total packet loss ratio, number of requested retransmission and number of received retransmission, and average retransmission time.