Introduction. N. C. State University. CSC557 Multimedia Computing and Networking. Fall Lecture # 01
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1 Introduction N. C. State University CSC557 Multimedia Computing and Networking Fall 2001 Lecture # 01
2 Class Website 2
3 What is "Multimedia"? 3 Example: a Realvideo broadcast
4 13 1 Audio capture Video capture 2 Compre ssion Method Audio playback Video playback 11 Decompre ssion Method
5 1 Camera and microphone convert analog optical and acoustic signals into analog electrical signals Video capture and audio capture (sound) cards convert into (uncompressed) digital signals with a specific quality level Compression hardware+software compresses the digital representation Compressed digital information is combined into a single file and stored File is transmitted by ftp over a network to a streaming media server and stored. Media server retrieves files on request and delivers them to network. Client machine contacts streaming media server and requests media playback. Server agrees and client+server constantly monitor the quality of transmission and playback. Routers in network provide requested quality of service if possible. Client machine receives streaming data and uncompresses it. Client machine buffers audio + video for playback. Client machine sends digital data to video card and sound card, which convert digital data into analog electrical signals. Camera and microphone convert analog electrical signals back into analog optical and acoustic signals
6 Some Applications 6 Person-to-person communication Education and training Entertainment Games News Marketing, advertising, sales Assisting the handicapped Remote guidance and exploration Data analysis and presentation
7 Converging Industries 7 Alliances, mergers, and takeovers Some examples of industries Publishing Recording (music) Education Movies, video, TV Consumer electronics Computer software and hardware Networking equipment vendors Network service providers (telephone, internet, cable TV, broadcast TV, wireless,...)
8 Multimedia 8 Applications Content creation and storage Access and delivery Hardware Software
9
10
11 Converged Company #1: AOL Time Warner billion $ in revenues Businesses Interactive Services and Properties (America Online) TV Networks Publishing (Time Inc.) Music (Warner Music Group) Films (Warner Bros., New Line Cinema) Cable Systems (Time Warner Cable) Statistics 130 million subscriptions (AOL, HBO, Time, TW Cable) 268 million magazine readers CNN reaches global audience of 1 billion AOL has 30 million members ICQ has 85 million registrants
12 AOL-T-W: Cable Systems 12 Cable TV delivery Digital video and music Video on demand Local cable news channels Roadrunner Internet service
13 AOL-T-W: Publishing 13 Time Inc. Time Warner Trade Publishing More than 60 magazines Several book publishers Audiobooks Direct marketing of CDs
14 AOL-T-W: Film 14 Warner Brothers Warner Brothers TV Castle Rock Entertainment Looney Tunes, Hanna-Barbera Warner Home Video Warner Brothers Studio Stores DC Comics
15 AOL-T-W: Music 15 Atlantic, Elektra, London, Warner Bros. Music distribution CD and DVD manufacturing
16 AOL-T-W: Networks 16 Turner Broadcasting, TBS, TNT, Cartoon Network, Turner Classic Movies... CNN Atlanta Braves, Atlanta Hawks, Atlanta Thrashers, Goodwill Games HBO, Cinemax, HBO productions WB television network, Kids WB
17 AOL-T-W: Interactive Services AOL, Compuserve Netscape.com, Netscape browser AOLTV (interactive TV) AOL Plus (multimedia content: video, audio, games) AOL mobile services ( , messaging) AOLbyphone Web services and info (Digital City, Mapquest, Moviefone) Messaging (AIM, ICQ) Winamp, Spinner (streaming media) Alliance with NTT DoCoMo mobile service
18
19 Converged Company #2: Sony billion $ in revenue Electronics group 65% of revenues Audio stereos, recorders, personal stereos Video television sets, cameras, VCRs/VTRs, DVD-video players, tapes Computing and communications displays, PCs, PDAs, peripherals, media, receivers, telephones, car navigation Electronic components semiconductors, memory, LCDs, CRTs, batteries One example product: Airboard portable, wireless, convergence of TV and Internet
20 Sony: Other 35% 20 Games: game consoles and software (Playstation) Music: Columbia, Sony Film and TV: Columbia, Sony Insurance and finance
21 Course Objectives 21 Learn about Audio, image and video 1. perception 2. compression 3. processing Playback and control of audio and video on computers Transport of audio and video across the Internet
22 and Non-Objectives 22 But not about The use of commercial tools for creative manipulation of digital media (well, maybe a little bit) The legal / political / commercial aspects of using and protecting digital media Analog devices (cameras, speakers, ) User interfaces Graphics Speech recognition Advanced topics in signal and image processing
23 What We Study 23 Basic signal processing Common compression techniques Perception and processing of sound Audio and voice compression Music (MIDI) Perception and processing of images Image compression (JPEG) Video standards
24 ( continued) 24 Video compression (MPEG) QoS issues, jitter buffers, playback Packet scheduling, dropping, and shaping in routers RSVP and Integrated Services Differentiated services (DiffServ) RTP, RTCP, RTSP SIP, MGCP, and VoIP MPLS support for QoS
25 Readings 25 Lecture notes and material on web (links provided) At the library, on reserve: Crowcroft: Internetworking Multimedia, TK C Huston: Internet Performance Survival Guide, TK I57 H Thomas: IPng and the TCIP/IP Protocols, TK T Keshav: An Engineering Approach to Computer Networking, TK K48,1997 Stevens: Internetworking with TCP/IP, vol. III, TK C Davie: MPLS Technology and Applications, TK I57 D Durham: Inside the Internet's Resource Reservation Protocol, TK D Hersent: IP Telephony, TK H Collins: Carrier Grade Voice Over IP, TK C Douskalis: Internet Telephony, TK D
26 ( continued) 26 Gibson: Digital Compression for Multimedia, QA D Rao: Techniques and Standards for Image, Video, and Audio Coding, TK R Haskell: Digital Video: An Introduction to MPEG-2, TK H Mitchell: MPEG Video Compression Standard, TK6680.M Crane: A Simplified Approach to Image Processing, TA1637.C McClellan: DSP First: A Multimedia Approach, TK M Goldberg: A Practical Handbook of Speech Coders, TK7882.S65. G Barnwell: Speech Coding: A Computer Laboratory Textbook, TK7882.S65 B37, 1996 Gibson: Multimedia Communications, QA M Fluckiger: Understanding Networked Multimedia, QA F Buford: Multimedia Systems, QA M Steinmetz: Multimedia: Computing, Communications, Applications, QA S Braut: The Musician's Guide to MIDI, MT723.B Possibly some articles handed out
27 Prerequisites 27 CSC/CPE/EE undergraduate course background Programming
28 Getting Help 28 Office hours Message board The TA
29 Exams, Homeworks 29 The calendar
30 What's Different About Multimedia? 30 Convergence of many technologies and markets
31 Why Should You Care About This Subject? 31 (your answer here)
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