overview of the multimedia networks
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Overview of The
Multimedia NetworksHamid R. Rabiee
Mostafa Salehi, Fatemeh Dabiran, Hoda Ayatollahi
Spring 2011
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Digital Media Lab - Sharif University of Technology
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Outlines
² Course Introduction (Syllabus)
² Course Outline
² Why Multimedia Networking?
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Multimedia Networking
² Instructors: Hamid R. Rabiee, PhD ([email protected])
² Office: CE department #804 or #803 (DML)
² TAs:
² Mostafa Salehi ([email protected])
² Office: CE department #803 (DML lab)
² Hoda Ayatollahi ([email protected] )
² Office: CE department #803 (DML lab)
² Fatemeh Dabiran ([email protected])
² Office: CE department #803 (DML lab)
² Hours:
² Class hours:
² Exercise hours:
² Course web page: http://dml.ir/?page_id=346
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Course Introduction
² The course goal:
² This course is primarily concerned with the problems that arise when
carrying audio/video contents over the modern communication networks
²The course will :² Present an overview of current/future multimedia applications and
architectures
² Discuss deployment problems
² Discuss Multimedia Network Design and study solutions
² Examine emerging technologies and open research problems related to
multimedia networking
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Course Introduction
² Prerequisites:
² Signal and Systems, Multimedia Systems, Computer Networks
² Background in Computer Systems Performance Evaluation (e.g., Simulation,
Experimental, or Analytical approaches)
² Experience with Matlab and GNU/Linux.
² Simulation Tool: OpNet
² Style:
² Both slides and whiteboard
² Reading List:
² Recommended books and papers
² Slides
² Handouts
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Course Introduction
² Evaluation:
² Home works
² About 7 series of home works
²30% of the final grade
² Quiz
² About 11 prearranged
² 10% of the final grade
² Midterm written exam
² 25% of the final grade
² Final written exam
² 25% of the final grade
²Critical Reading & Presentation
² 10% of the final grade
² Projects (+)
² 10% of the final grade
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Course Outline
² Introduction
² Fundamentals of Multimedia
² Background Information similar to the ones covered in the Multimedia Systems
² Fundamentals of Next Generation Networks
² Quality of Service
² Principles (e.g. Admission Control and Shaping/Policing)
² QoS Architecture (Integrated services; Differentiated services)
²Traffic engineering (Fair Scheduling)
² Flow and congestion control (Buffer Management)
² Error Correction & concealment
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Course Outline
² Multimedia over IP (IP multicast)
² Multimedia over Overlay networks
² Multimedia Applications
² Multimedia Protocols
² Signaling Protocols (SIP, H.323), Streaming (Real-time) Protocols (RTP, RTCP)
² IP Multimedia Subsystem (IMS)
² Multimedia over Wireless/ sensor network
² Multimedia Networking Applications
² Digital TV, Voice Over IP, IPTV, Audio/video Conferencing, Interactive Multiplier
Games, Application-Level Framing, Video Servers
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Course Outline
² Multimedia Network Security
² Encryption, digital signatures, authentication, IP security
² Digital watermarking security features in multimedia compression standards,
secure media streaming
² Content Networks
² Convergence Networks
² Hot Research Topics
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Why Multimedia Networking?
² The use of IP-based Internet is growing , both in business & home usage
² Growth of networked multimedia applications on the Internet
² A balance of digital broadcasting with multimedia streaming over IP networks
² IP network, especially Internet, is becoming a very attractive channel for multimedia
communications.
² Dedicated networks and ATM are not widely available to bulk of users
² There are many applications for Internet multimedia:
² Internet telephone, Internet TV, video conferencing, network games, remote
corroboration, media rich social networks, …
² IP uses packet switching
² Suitable for unexpected burst of data without establishing an explicit connection
² Bandwidth is shared and so data can be sent at any time
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Networked Multimedia Applications
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Music
Streaming
Information
SearchMovies
StreamingFinance,
Brokerage
Digital Photos
The Internet cloud
Video Clip
Attachment
Video
Conference
VoIP
WirelessWirelessBrowsingBrowsing
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Networked Multimedia Applications
² Multimedia Extended Email
² World Wide Web
² Video Distribution Services
² Video Conferencing
² Interactive Distributed Games
² Virtual Reality
² E-Learning
² Instant Messaging
² Sometimes there may be only one media, but similar requirements:
² Image Distribution, Telephony, Radio, Jukebox Services, Document Archives
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Classes of Internet Multimedia Apps
² Streaming stored media
² Stored on server
² Examples: pre-recorded songs, famous lectures, video-on-demand
²Streaming live media² “Captured” from live camera, radio, T.V.
² 1-way communication, maybe multicast
² Examples: concerts, radio broadcasts, lectures
² Real-time interactive media
² 2-way communication
² Examples: Internet phone, video conference
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A Sample Framework of Media Delivery
Media
Encoding
Audio
VideoAnimation
Web
Server
Send Request
to Media
Server
Media
Server
Proprietary
Format
•Multicast capable
•More Robust
•Access to Storage
•Relieves Web Server
Send Stream
To Clients
•Standalone player
•Java based player
•Browser plug-in player
•Appliance
•Decode
•Buffer
•Sync.
To hear or view a media file
without downloading it
Note: P2P applications and
Services increasing
Clients
Send Request
To Servers
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Multimedia Expectations
²Multimedia Expectations from a Communication Network
² t ra f fic requirements
² limits on real-time parameters (delay, jitter)
²bandwidth and reliability
²sychronizat ion
² funct ion al requirements
²support for multimedia services such as multicasting, security,
mobility and session management
²More about media & multimedia on next session
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Main Problems in Multimedia Applications
² Supporting multimedia applications over a computer network renders the
application distributed.
² Multimedia Transmission over Wireless/Wired networks
² Convergence on Wireless, Multimedia, and Internet
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Multimedia Capability
Enhanced Mobility
Full ConnectivityMultimedia Internet
Wireless
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Main Problems in Multimedia Applications
² Multimedia data is huge
² Audio, Images, graphics, and video
² Wireless/Internet lacks performance guarantee
²Best effort service, no QoS provision by itself
² Packet loss, congestion, latency, delay jitters
² Errors in wireless links
² Internet is heterogeneous
² Varying network conditions, user preferences, device capabilities
² Question : How to Enable EFFICIENT, ROBUST, UBIQUI TOUS Delivery?
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Multimedia Networking Issues
² Media Issues
² Huge amount of data
² Different formats of media (need for
Coders & Decoders, Different
Applications, transmission protocols, ...)
² Issues for real-time transport of
streaming multimedia
² Quality of media
² Network Issues
² Availability and Performance of NW
Bandwidth
² Reliability of Transport and
Performance
² Availability of “Media-aware”
Middleware
² Availability and Performance of
Applications
² Required standards for data exchange
in heterogeneous environments
² Security and copyright Issues
² Wireless networks issues
² Integration of wired and wireless
heterogeneous networking systems
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Solutions
² Two basic Approaches
² Network-centric
² End system-based
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End-System based solutions
² End-System Based
² Compression
² Layered and scalable coding
² Base layer, enhancement layers
² MPEG: SNR, spatial, temporal scalability
² MPEG-4 fine granularity scalability (FGS), and H.264
²MPEG Scalable Video Coding (SVC)
² Media distribution
² Media synchronization
² Multimedia network protocol
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End-System based solutions
² End-system Based
² QoS Control
² Congestion Control
²Source-based rate control, Receiver-based rate control, Hybridrate control
² Rate-adaptive source encoding
² Rate shaping
² Error Control
² FEC, retransmission (ARQ), error-resilient encoding, error concealment
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Network-centric based solutions
² Network-centric
² Packet Classification
² Packet is marked based on the Type of Service
² Packet Scheduling
² choose next packet to send on link
² Integrated Services: flow based
² architecture for providing QOS guarantees in IP networks for individual application
sessions
² Differentiated Services: packet based
² Mark IP packet to specify treatment
² Multi Protocol Label Switching: flow+ packet based
² A forwarding scheme that tags packets with labels
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Sharif University of Technology, Department of Computer Engineering, Multimedia Systems Course
Next Session
Multimedia Networking
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References
² Shashank Khanvil kar, Faisal Bashi r , Dan Schonfeld, and Ashfaq Khokhar,
“ Multimedia Networks and Communication”, University of Illinois at
Chicago, 2004.
² Jenq-Neng Hwang, “Introduction to multimedia networking”, Cambridge
University Press,
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