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Multimedia Over IP: RTP, RTCP, RTSP. “Computer Science” Department of Informatics Athens University of Economics and Business. Λουκάς Ελευθέριος. Problem & Solution. Problem: Multimedia Networking is not a trivial Task High bandwidth requirements Real-time, bursty traffic Solution:

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Multimedia over ip rtp rtcp rtsp

Multimedia Over IP: RTP, RTCP, RTSP

“Computer Science”

Department of Informatics

Athens University of Economics and Business

Λουκάς Ελευθέριος


Problem solution
Problem & Solution

  • Problem:

    Multimedia Networking is not a trivial Task

    • High bandwidth requirements

    • Real-time, bursty traffic

  • Solution:

    • Expensive solution – ATM networks

    • Rational solution – Internet


Rational solution internet
Rational Solution – Internet

  • Issues must be solved

    • Enough bandwidth

    • Protocol support multicast reduce traffic

    • Resource reservation (real-time applications)

    • Guarantees for timing issues (packet switch network)

  • Integrated Service Model

    • RSVP

    • RTP

    • RTCP

    • RTSP

Working foundation for real time services


Content
Content

  • Real-time Transport Protocol (RTP)

  • Real-time Control Protocol (RTCP)

  • Real-time Streaming Protocol (RTSP)


Real time transport protocol rtp
Real-time Transport Protocol (RTP)

  • IP-based protocol

  • Real-time data transport

  • Run on top of UDP

    • Support multicast

    • Delay is better

      than reliability

  • Multicast/Unicast

  • No QoS guarantees


Rtp packet format
RTP Packet Format

  • Payload Type (7 Bits)

    • Multimedia data type

  • Sequence Number (16 Bits)

    • Frame re-construction

    • Error detection

  • Timestamp (32 Bits)

    • Play out data in correct rate

    • Synchronize different streams (audio, video data)

  • Source Identification (32 Bits)

    • Who is talking… (conference)


Rtp session
RTP Session

  • RTP Session: IP address + RTP port + RTCP port

  • RTP session sending/receiving RTP data group of

    participants

  • Each session is a pair of transport addresses

Audio

Audio

Video

Video


Content1
Content

  • Real-time Transport Protocol (RTP)

  • Real-time Control Protocol (RTCP)

  • Real-time Streaming Protocol (RTSP)


Real time control protocol rtcp
Real-time Control Protocol (RTCP)

  • Control Protocol-conjunct with RTP

  • Feedback for data quality, information for memberships

  • Report PDUs between sources/destinations

    • receiver reception report

    • sender report

    • source description report

  • Reports contain statistics

    • the number of RTP-PDUs sent

    • number of RTP-PDUs lost

    • inter-arrival jitter

  • Used by application to modify sender transmission

    rates and for diagnostics purposes


Rtcp message types
RTCP Message Types

  • Recevier Reports (RR)not active senders

    • Feedback of data delivery

    • Packet lost, jitter, timestamps (RTT)

  • Sender Report (SR)  active senders

    • Intermedia synchronization, number of bytes sent

  • SDES, BYE, APP


Rtcp services
RTCP Services

  • QoS monitoring and congestion control

    • Feedback for quality of data

  • Source identification

    • Canonical Namesunique identifiers

  • Inter-media synchronization

    • Sender/ Receiver

  • Control information scaling

    • Limit the control traffic


Rtp features
RTP Features

  • End-to-end delivery service for real-time data

    • No mechanism to ensure timely delivery

    • Depends on RSVP to reserve resources

  • No reliability, No flow/congestion control

    • Timestamps, sequence number

    • Implemented with applications

  • RTP/RTCP reports provide flow/congestion control

  • Is not complete, is open to add new formats


Content2
Content

  • Real-time Transport Protocol (RTP)

  • Real-time Control Protocol (RTCP)

  • Real-time Streaming Protocol (RTSP)


Real time streaming protocol rtsp
Real-time Streaming Protocol (RTSP)

  • Client-Server multimedia presentation protocol

  • Support streaming over IP network

  • Work with lower–level protocols (RTP, RSVP)

  • Network Remote Control (PLAY, PAUSE, STOP)

  • Transport methods: Unicast /Multicast

  • RTSP Operations

    • Receive media from server

    • Invite media server to conference

    • Add media to an existing presentation


Rtsp overview

Web Server

web browser

HTTP

presentation descriptor

Presentation

descriptor

Web Server/Media server

RTSP

media player

pres. desc,streaming commands

RTP/RTCP

audio/video content

RTSP Overview



Rtsp session

RTSP

server

TCP

get UDP port

data

source

UDP

RTCP

media server

media player

RTSP Session

Default port 554

RTSP SETUP

RTSP OK

RTSP PLAY

RTSP

client

RTSP OK

RTSP TEARDOWN

RTSP OK

choose

UDP port

RTP VIDEO

AV

subsystem

RTP AUDIO


Rtsp features
RTSP Features

  • Application level protocol

  • Syntax and operations similar to HTTP

  • Use methods (SETUP, TEARDOWN)

  • Servers & clients can issue requests

  • Support multiple system platforms



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