CPET 581 Multimedia Networking Applications

Introduction

Introduction

Syllabus Topics covered in this class

Syllabus

Course materials Fundamentals of Multimedia, by Ze-Nian Li and Mark

S Drew Computer Network: A Top-Down Approach, by James

F. Kurose and Keith W. Ross Research papers

Syllabus

Grading Exams 30% Homework and Lab Assignments 30% Paper/Project/Presentation: 30% Class participation and discussion 10%

Multimedia Applications

Convergence of data, voice and video over the Internet Multimedia transmission

Download and play – ftp, nonrealtime Play while downloading – streaming multimedia, realtime

Multimedia Streaming Applications Video on demand – pre-recorded video

• Netflix - “watch instantly”• pay-per-view

Video conferencing – live video streaming VoIP (skype) Yahoo messenger, Hotmail messenger IPTV, mobile TV Mobile video calling

Questions: How do you watch TV? How do you make a phone call?

Multimedia Applications

Multimedia Streaming Applications Youtube Apple : quick time streaming Google video Streaming Video on Mobile phones …

Multimedia Applications

Compressed multimedia E.g. , A video image of resolution 512 × 512

pixels, each pixel uses 24 bits, played at 30 frames per second,

one second uncompressed video needs about 24 Mb storage

Calculation:

Not efficient for storage and transmission

Multimedia Applications

Lossy and lossless compression to reduce bit rates

Image and Video compression standard JPEG H.264/MPEG4

Design goal High quality with low bit rates

Quality of Service

Quality of Service requirement Bandwidth Packet loss Delay and jitter

Adaptive video streams Heterogeneous networks

• Network bandwidth• Capacity of the devices

Without packet loss With packet loss

How packet loss and delay affect the visual quality of video?

Protocol

Protocol UDP - unreliableTCP – reliable, not efficientRTP (Real-time transport

protocol)•Socket programming to build a

networking application

How to provide QoS

End to End transmissionNetwork support

InterServDiffServ

Network technology

Unicast via Multicast

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Server

Clients

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Server

Clients

Unicast Multicast

Multicast group

Network technology

Unicast or Multicast Content delivery network Client/Server or Peer-to-peer

Server based Network

Peer-to-Peer Network

Network technology

Peer-to-peer Network File transfer (BitTorrent) Voice-over-IP (Skype) Video streaming (PPlive)

Video streaming over wireless and mobile network Wi-Fi WiMax Sensor network

Multimedia Networking Techniques Covered

at different layers of the network model application layer, transport layer and network layer

With different network architectures, client-server and peer-to-peer

at different locations of the network end host, proxy server and network router

at different sides of an end-to-end application the client side and the server side

at different communication networks, wired networks, and wireless and mobile networks

with different transmission schemes unicast, multicast and broadcast