Audio and video streaming

Audio and Video StreamingAudio and Video Streaming

Presented by: Thanh LyLiqin ZhangRonald TogelangHector Frausto

AGENDA

• Introduction- D:\Introduction.avi

• Audio Streaming Overview• Video Streaming Overview• Audio Streaming Demonstration• Video Streaming Demonstration• Questions and Answers

AUDIO STREAMING AUDIO STREAMING OVERVIEWOVERVIEW

Audio File Features Audio Streaming Concept Audio Streaming Advantages Audio Streaming Applications Audio Streaming Format Audio Streaming Products

Audio File FeaturesAudio File Features

Audio file is a record of captured sound that can be played back– e.g. .WAV File

Audio files are compressed for storage or faster transmission

Requires high bandwidth to transfer across the network

LAN, Intranet, Internet

Audio Streaming ConceptAudio Streaming Concept

.WAV Live Broadcast

.ASF

Real Producer.RM

Windows Media Encoder Real Producer 7.0

PC

Audio FormatPC

Windows MediaStreaming Software

Audio Streaming ConceptAudio Streaming Concept

Analog-to-Digital modulation Streaming audio technologies relies on:

Sound sequencesCompression schemes

Compression schemes (encoding) decreases the audio’s bandwidth requirements:Lowering the audio’s sampling rateFiltering high frequenciesPerforming other waveform

Audio Streaming AdvantagesAudio Streaming Advantages

Real time audio content. Low bandwidth media used. No waiting for downloading audio file. Internet users can enjoy a live online program.

Audio Streaming ApplicationsAudio Streaming Applications

Long-distance or automated training Seminars Concerts Speeches Music samples Online corporate messages Hear the news / Radio

Audio FormatsAudio Formats

Microsoft Windows Media Formats– .avi, .asf, .asx, .rmi, .wav

Moving Pictures Experts Group (MPEG)– .mp3

Musical Instrument Digital Interface (MIDI)– .mid, .rmi

Apple Quick Time, Macintosh AIFF Resource– .qt, .aif, .aifc, .aiff, .mov

UNIX Formats– .au, .snd

Audio Streaming ProductsAudio Streaming Products

Window Media Technologies (Microsoft) RealSystem G2 (RealNetworks) Shockwave Streaming Audio (Macromedia) IBM Bamba (IBM) Streamworks (Xing Technology) Media Player (Netscape)

Windows Media TechnologiesWindows Media Technologiesby Microsoftby Microsoft

Leading digital media platform. Windows Media Technologies consist of :

– Windows Media Player– Windows Media Services– Windows Media Tools– Windows Media SDK

Free download at http://www.microsoft.com/windows/windowsmedia/

Windows Media TechnologiesWindows Media Technologies

Windows Media Audio codec provides FM-radio-quality sound at half the bit rate of MP3

Integration with other Microsoft products (Windows NT Server, Microsoft Site Server, Microsoft BackOffice)

Digital rights management Advanced Compression Technology Broadcasting

WMT AdvantagesWMT Advantages

Wide bandwidth range Intelligent streaming Multiple bit rate encoding High scalability Built-in multicast service Seamless stream switching Easy Internet Radio Distribution

Real NetworksReal Networks

High quality streaming audio at all bandwidths on both the Internet and corporate Intranets.

Support realtime and on-demand, all sounds (stereo and mono)

Take advantage of key features of Window 2000 (load balancing, clustering, stability)

Operating systems as Window NT, Linux, Sun Solaris

Real System G2 Products & Real System G2 Products & AdvantagesAdvantages

RealPlayer 7– Over 150 live radio stations built-in, superb

audio RealProducer 7

– Streaming Software; Efficient encoding; Reach the widest possible audience; choice of operating systems

RealPresenter G2– Live/recorded capability; Presentation Manager

RealSystem G2 Products & Advantages

RealSlideshow 2– Combine pictures with music or speech,

customize the layout of presentation RealServer 7

– 60 simultaneous sessions of live or on-demand streaming; Near CD quality Internet audio

Free download at:– http://www.realnetworks.com/products/

Video StreamingVideo Streaming

Video Streaming Objective Streaming Advantages Video Streaming Architecture Compression and Decompression-codec MPEG 1-4 Introduction Major Products and Features Comparison

Video Streaming ObjectiveVideo Streaming Objective

The object is to overcome the negative effects of physical distance and network technology limitation.

Streaming AdvantagesStreaming Advantages

Reduce setup time Reduction in client storage requirement Video can be viewed in real time Transmission signals over low bandwidth facilities

Video Streaming ArchitectureVideo Streaming Architecture

Content Creation/Capture Content Management Content Formatting (Compression) Delivery Distribution Presentation (Viewing) View Control

Video CaptureVideo Capture

Converting analog to video signals– A special video capture card to convert the

analog signals to digital form and compresses the data.

– Also digital video devices that can capture images and transfer to a computer

Content ManagementContent Management

Critical in video server The purpose including create, collect, catalog,

organize, store, and access to massive multimedia information database

Video Input FormatsVideo Input Formats

AVI ActiveMovie Cinepak Indeo motion-JPEG

MPEG QuickTime RealVideo Video for Windows XGA

Video FormatsVideo FormatsAVI & ASFAVI & ASF

Developed by Microsoft AVI (Audio Video Interleaved)

- limited to 320x240 resolution

- 30 frames per second ASF (Advanced Streaming Format)

- Has been submitted to ISO for standardization

- Expected to replace AVI format

CodecCodec(Compressor/Decompressor)(Compressor/Decompressor)

Coding techniques to compress video data The newest codec change their sampling rate as

they run Choice of codec is the biggest factor to determine

the bandwidth needed to connect the server and receive content

Many of the codecs follow international standards

Content CompressionContent Compression

MPEG (A working group of ISO)- The most common standard for video

compression and file formats- Generally produce better quality video than other

formats- High compression rate- MPEG1, MPEG2 and MPEG4

MPEG-1MPEG-1

MPEG-1 was designed for coding progressive video at a transmission rate of about 1.5 million bits per second.

It was designed specifically for Video-CD and CD-i media.

MPEG-1 audio layer-3 (MP3) has also evolved from early MPEG work.

MPEG-2MPEG-2

MPEG-2 was designed for coding interlaced images at transmission rates above 4 million bits per second.

MPEG-2 is used for digital TV broadcast and

DVD. An MPEG-2 player can handle MPEG-1 data as

well.

MPEG-3MPEG-3

A proposed MPEG-3 standard, intended for High Definition TV (HDTV), was merged with the MPEG-2 standard when it became apparent that the MPEG-2 standard met the HDTV requirements.

MPEG-4MPEG-4

An MPEG-4 standard is in the final stages of development and release.

It is a much more ambitious standard and addresses speech and video synthesis, fractal geometry, computer visualization, and an artificial intelligence (AI) approach to reconstructing images.

Major ProductsMajor Products

Microsoft Windows Media Technologies

http://www.microsoft.com/windows/windowsmedia/

RealSystem G2

http://www.realnetwork.com

ComparisonComparisonWMT –vs- RealSystem G2WMT –vs- RealSystem G2

Head to head comparison

Feature Comparison

More Information http://www.microsoft.com/windows/windowsmedia/

ComparisonComparisonWMT –vs- RealSystem G2WMT –vs- RealSystem G2

Cost Analysis

- Prepared by Approach, Inc., Key findings

- Both streaming products results in positive

returns on investment

- Microsoft solution is more economical than the

RealNetwork solution Download in Word format

Audio Streaming ArchitectureAudio Streaming Architecture

Creating Audio File Demonstration of Streaming Software Demo of Streaming Process

– Windows Media Encoder – RealProducer 7 Basic

Play the Audio File

Creating Audio FileCreating Audio File

Record From File– Audio files located in your hard drive

Record Form Media Device– Media device such as Microphone, CD Player,

PC Camera, etc. Live Broadcast

– Broadcast live media stream from your computer

Installation of Streaming Installation of Streaming SoftwareSoftware

Windows Media Tools– Windows Media Encoder

RealSystems G2– RealProducer 7 Basic

Windows Media TechnologiesWindows Media Technologies

http://www.microsoft.com/windows/windowsmedia

Download Windows Media ToolsDownload Windows Media Tools

RealSystem G2RealSystem G2Download RealProducerDownload RealProducer

http://www.realnetworks.com/products/producer/

Playing Audio FilePlaying Audio File

Windows Media Player RealPlayer

Windows Media Player 6.4Windows Media Player 6.4


Download RealPlayerDownload RealPlayer

http://www.real.com/player/index

Real Player 7.0 BasicReal Player 7.0 Basic

Video Streaming PresentationVideo Streaming Presentation

• Active Streaming Format (ASF)

- MS Defacto standard for streaming video.• Real Media (RM)

- Real’s standard for streaming video


• Codec selections from Real Media.

Video StreamingVideo Streaming• Codec Selections from Windows Media.


Streaming with Real Producer.

• Real Producer.

- C:\Program Files\REAL\RealProducer\realprod.exe


Streaming with Windows Media Encoder .

• Windows Media.

- C:\Program Files\Windows Media Components\Tools\NsRex.exe


• Using Windows Media Player.

- C:\Program Files\Windows Media Player\mplayer2.exe


• Streamed file size comparison.

- C:\WINDOWS\EXPLORER.SCF

• Unstreamed *.AVI file = 155,290 KB• RealMedia Streamed file *.RM = 483 KB• Windows Media Streamed file *.ASF = 1,283 KB

Video Streaming StatisticsVideo Streaming Statistics

Video Streaming StatisticsVideo Streaming Statistics


• Live feed Video Capture.

- C:\Program Files\Logitech\Logitech QuickCam\QuickCam.exe

• Stream from live feed.

- C:\Program Files\REAL\RealProducer\realprod.exe

- C:\Program Files\Windows Media Components\Tools\NsRex.exe

Audio/Video Streaming SummaryAudio/Video Streaming Summary

Capture Audio/Video– Create your file

Install the streaming software– Windows Media Tools

http://www.microsoft.com/windows/windowsmedia/– RealProducer 7 Basic

http://www.realnetworks.com/products/

Audio/Video Streaming SummaryAudio/Video Streaming Summary

Play the Audio Stream File

– Windows Media Player 6.4


– RealPlayer 7 Basic

http://www.real.com/player/index

Questions and AnswersQuestions and Answers