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Streaming Overview Final.ppt
 

Streaming Overview Final.ppt

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    Streaming Overview Final.ppt Streaming Overview Final.ppt Presentation Transcript

    • Audio and Video Streaming By Nanda Ganesan, Ph.D. © Nanda Ganesan, All rights reserved
    • AUDIO STREAMING OVERVIEW
      • Audio File Features
      • Audio Streaming Concept
      • Audio Streaming Advantages
      • Audio Streaming Applications
      • Audio Streaming Format
      • Audio Streaming Products
    • Audio File Features
      • Audio file is a record of captured sound that can be played back
        • The WAV File is an example
      • Audio files are compressed for storage and faster transmission
      • Requires high bandwidth to transfer across the network and the Internet
    • The Wav File Format
      • The wav file format is also known as the basic file format
        • Somewhat similar to the .bmp format for images
      • Requires the highest storage compared to other compressed and streamed file formats
        • Example: rm, wma etc.
    • Audio Streaming Concept .WAV .ASF, .WMA Real Producer . RM Windows Media Encoder or Real Producer  PC Audio Format  PC Windows Media Streaming Software
    • Audio Streaming
      • Step1: Digitize audio
        • PCM
      • Step 2: Compress the digitized audio
        • Lowering the audio’s sampling rate
        • Filtering high frequencies
        • Performing other waveform transformation
      • Ensure the continuous streaming of audio packets
    • Pulse Code Modulation Values
      • Sampling Frequency
        • 11,000 Hz for example
      • Sampling depth
        • 8 bits for example
      • Channels
        • Mono or stereo
    • Streaming Process Digitize (PCM) Audio Digitized audio Streaming Software Streamed audio
    • Audio Streaming Advantages
      • Low bandwidth and storage
      • Able to deliver audio in real time over a communication line
      • Efficient and effective delivery of audio over the Internet
    • Audio Streaming Applications
      • Long-distance or automated seminars and training sessions
      • Internet music
      • Internet radio
      • Streamed audio for a variety of web and CD applications
    • Audio Format: MPEG
      • Moving Pictures Expert Format
        • mp3
    • Audio Format: Apple Related
      • Quicktime and other Macintosh related standards
        • .qt, .aif, .aifc, .aiff, .mov
    • Audio Format: Unix Related
      • au
      • snd
    • Audio Streaming Products
      • Window Media Technologies (Microsoft)
      • Real System (Real Networks)
      • Shockwave Streaming Audio (Macromedia)
      • Linux based streaming products
    • Windows Media Technologies
      • Windows Media Audio 9 Series
      • Windows Media Video 9 Series
      • Windows Media Encoder 9 Series
      • Windows Media Services 9 Series
      • Windows Media Player 9 Series
      • Windows Media Rights Manager 9 Series
      • Windows Media 9 Series SDK
    • Windows Media Link
      • http://www. microsoft .com/windows/ windowsmedia /
    • Windows Media Technologies (WMT)
      • Windows Media Audio CODEC provides excellent quality at low bit rates
      • Integration with other Microsoft products (Windows NT Server, Microsoft Site Server, Microsoft BackOffice)
      • Digital rights management
      • Advanced Compression Technology Broadcasting
    • Audio Comparison
    • Video Comparison
    • WMT Advantages
      • Multiple Bit Rate and Multiple Language Support
      • Variable speed playback
      • Highly compressed audio and video
      • Audio CODEC is optimized for dial-up rates
      • Digital 5.1 surround sound CODEC
      • Lossless audio compression
      • Good scalability to larger audience
      • Live digital rights management
      • Support for Plug-in (C++ etc.)
      • (For further info: )
    • Multiple Bit Rate and Multiple Language Support
      • With a single click of one file, the Windows Media Player 9 Series can automatically pick the best video size and audio quality to stream, based on the current connection speed – and it dynamically adapts during streaming.
      • The player can automatically choose the preferred audio language, or the user can select or change languages on-the-fly during playback.
      • (source: Microsoft)
    • Real 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 such as Window NT, Linux, Sun Solaris etc. are all supported
    • Real System G2 Products & Advantages
      • RealPlayer 8
        • 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 Streaming
      • Video Streaming Objective
      • Streaming Advantages
      • Video Streaming Architecture
      • Compression and Decompression-codec
      • MPEG 1-4 Introduction
      • Major Products and Features Comparison
    • Video Streaming Objective
      • The object is to overcome the negative effects of physical distance and network technology limitation.
    • Streaming Advantages
      • Reduce setup time
      • Reduction in client storage requirement
      • Video can be viewed in real time
      • Transmission signals over low bandwidth facilities
    • Video Streaming Architecture
      • Content Creation/Capture
      • Content Management
      • Content Formatting (Compression)
      • Delivery
      • Distribution
      • Presentation (Viewing)
      • View Control
    • Video 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 Management
      • Critical in video server
      • The purpose including create, collect, catalog, organize, store, and access to massive multimedia information database
    • Video Input Formats
      • AVI
      • ActiveMovie
      • Cinepak
      • Indeo
      • motion-JPEG
      • MPEG
      • QuickTime
      • RealVideo
      • Video for Windows
      • XGA
    • Video Formats AVI & 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
    • Standard Window Size
      • 320X240
      • 640X480
    • Frame Rates
      • 4-6 fps
        • Absolute minimum for video conferencing
      • 11-14 fps
        • The norm for video conferencing
      • 30 fps
        • Full motion video
    • Codec (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 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, MPEG3 and MPEG4
    • MPEG-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-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-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-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 Products
      • Microsoft Windows Media Technologies
      • http://www. microsoft .com/windows/ windowsmedia /
      • RealSystem G2
      • http://www. realnetwork .com
    • Comparison WMT –vs- RealSystem G2
      • Head to head comparison
      • Feature Comparison
      • M ore Information http://www. microsoft .com/windows/ windowsmedia /
    • Comparison WMT –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 Architecture
      • Creating Audio File
      • Demonstration of Streaming Software
      • Demo of Streaming Process
        • Windows Media Encoder
        • RealProducer 7 Basic
      • Play the Audio File
    • Creating 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 Software
      • Windows Media Tools
        • Windows Media Encoder
      • RealSystems G2
        • RealProducer 7 Basic
    • Windows Media Technologies http://www.microsoft.com/windows/windowsmedia Download Windows Media Tools
    • RealSystem G2 Download RealProducer http://www.realnetworks.com/products/producer/
    • Playing Audio File
      • Windows Media Player
      • RealPlayer
    • Windows Media Player 7 http://www.microsoft.com/windows/windowsmedia/
    • Download RealPlayer http://www.real.com/player/index
    • Real Player 7.0 Basic
    • Video Streaming Presentation
      • Active Streaming Format (ASF)
      • - MS Defacto standard for streaming video.
      • Real Media (RM)
      • - Real’s standard for streaming video
    • Video Streaming
      • Codec selections from Real Media.
    • Video Streaming
      • Codec Selections from Windows Media.
    • Video Streaming
      • Streaming with Real Producer.
      • Real Producer.
        • - C:Program FilesREAL RealProducer realprod .exe
    • Video Streaming
      • Streaming with Windows Media Encoder .
      • Windows Media.
        • - C:Program FilesWindows Media ComponentsTools NsRex .exe
    • Video Streaming
      • Using Windows Media Player.
        • - C:Program FilesWindows Media Playermplayer2.exe
    • Video Streaming
      • Streamed file size comparison.
      • - C:WINDOWSEXPLORER.SCF
      • Unstreamed *.AVI file = 155,290 KB
      • RealMedia Streamed file *.RM = 483 KB
      • Windows Media Streamed file *.ASF = 1,283 KB
    • Video Streaming Statistics
    • Video Streaming Statistics
    • Video Streaming
      • Live feed Video Capture.
        • - C:Program FilesLogitechLogitech QuickCam QuickCam .exe
      • Stream from live feed.
      • - C:Program FilesREAL RealProducer realprod .exe
      • - C:Program FilesWindows Media ComponentsTools NsRex .exe
    • Audio/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 Summary
      • Play the Audio Stream File
        • Windows Media Player 7
        • http://www.microsoft.com/windows/windowsmedia/
        • RealPlayer 7 Basic
        • http://www.real.com/player/index
    • The End