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    Audio&Video Audio&Video Presentation Transcript

    • INF 385E Intro to IAWenbin Zhang
      Audio & Video
    • Agenda
      The Past & Now
      Uses of Web Audio & Video
      Audio & Video Formats
      Streaming
      Video hosting
      Online music
      Podcast
      Internet TV
      What’s Hot and the Future
    • The Past
      Neilson’s usability guidelines for video and streaming media from 1999
      Didn’t you hate dial-up when it came to audio & video?
    • Now
      On January 6, 2009, Phil Schiller announced that over 6 billion songs had been downloaded since the service first launched on April 28, 2003
      In 2008, Youtube surpassed yahoo and became the 2nd largest search engine; in March2009, YouTube surpassed 100M U.S.Viewers
      Google/YouTube streams 5.5 billion videos/month in the U.S.
      Every single minute, over 20 hours of videos are uploaded to youtube.
      iTunes store’s only 6 years old, and Youtube 4!!
    • How Are Online Audio & Video Used?
      Keeping abreast of trends and news (CNN, MSNBC, ESPN)
      Entertainment in multiple way (Hulu, Youtube, Last.fm)
      Elearning (Instructional, iTunes U, Audible)
      Live communications: Live chat(Skype, Google Talk via VoIP), Video conferencing, etc.
      Marketing & Advertising (pre-roll, post-roll, in-banner video ads; product/service demos)
    • How Are Online Audio & Video Used?
      Multipurpose:
      Edutainment=eLearning + Entertainment (You Suck At Photoshop)
      Advertainment=Advertising + Entertainment (Samsung HD Camera Trick Challenge; Tmobile Dance)
      Etc.
    • Audio & Video Formats
      Containers: tells how the data are stored & can have metadata (FLV, MP4, Quicktime, Ogg)
      Codecs: Coder-decoder/ Compressor-decompressor
      Lossless Audio Formats:
      Uncompressed:AIFF, WAV
      Compressed : FLAC, Monkey’s Audio, Shorten
      Lossy Audio: MP3, AAC, Vorbis(ogg), WMA, RealAudio
    • Comparison of Audio compressions
    • Audio & Video Formats
      Video Formats
      Digital Tape Formats: DV, HDV, AVCHD
      Digital Disc Formats: DVD, Blue-ray Disc
      Lossy Formats: H.264/MPEG-4 AVC, MPEG-4 ASP, RealVideo, WMV
    • Encoder/Transcoders
      Open Source: Format factory, Handbrake.fr, MediaCoder
      Proprietary: Sorenson Squeeze, Apple Compressor, Adobe Media Encoder
    • Streaming
      Before Streaming: Download before playback
      After Streaming: Download as playback
      Progressive Download(On-Demand Streaming): Flash Video, Quick Time Video… Files can be stored on regular Web servers, Using HTTP
      True Streaming(Living Streaming): Live broadcasting, Online Radio… A Streaming media server that executes control, Protocols vary(RTSP, RTP, etc.)
    • Video Hosting
      How to Choose GUC Video Sharing Sites:
      Traffic
      Audience
      File Size , Number &Time Limits
      Compression Quality
      Formats
      Downloadability
      Editing Capabilities
      Ads
      Payments
    • Emebbed Audio & Video
      Wanna Do It Yourself?
      Uploading Your Files to Your Web Server
      Embedding Multimedia Files in HTML by Using Special Tags(See w3school tutorial)
      Embedding Flash Video by Using Dreamveaver
    • Online Video Platform
      Wanna Meet Higher Demand & Have Your Own Youtube-looking Site?
      “White Brand Providers”
      Business Focused: Brightcove, Vzaar
      Consumer Focused: Fliggo
      Open Source Video Sharing: PHPmotion, Plumi (Lunux)
    • Online Music
      Online Digital Music Stores: iTunes Music Store, Amazon Mp3, Rhapsody, Zune Market Place … Largest Amounts of Music, No More than 1$/song
      Internet Radio: Last.fm, Pandora, Shoutcast … All streaming, Little Playback but easy to tune in to your favorite genres
    • Online Music
      Online Music Databases & Search Engines: Internet Archives, Grooveshark…
      Download For Free: Limeware, Rapidlibrary… Free file sharing (especially if you wanna find bootleg records)
    • Podcast
      iPod + Broadcast = Podcast
       Series of digital media files that are released episodically and downloaded through RSS
      Producing: Audacity(Save as MP3)
      Publishing: Find a Host(Web host or Blog), Upload, Generate RSS Reeds, Submit to a Directory(iTunes, Zune, etc.)
      Don’t Forget ID3 Tags
    • Internet TV
      Wed TV: Cnet TV, Rvision3, Adobe TV, G4 … Original, Episodic Shows Distributed Exclusively Online As Opposed to Legacy Broadcast;
      So-called Internet TV: Hulu … in a broader sense, Any Broadcast TV Shows Repackaged for Online Viewing
      P2PTV: BBC iPlayer(UK-based), Reeltime(US-based), PPstream(China-based) … Peer-2-peer application designed to redistribute video streams on a P2P network
    • What’s Hot and The Future
      Online Media Guides or Aggregators: Casttv, Clicker, Ovguide, Fancast …
      Cross-Platform Mass Distribution Services: Blip.tv, Tubemogul
      Instant Video Sharing: 12seconds.tv, Qik, Tokbox
      User Generated Live Streaming: Ustream, Justin.tv
      Content Recognition for Music: Shazam, Midomi
    • Thank You All
      Questions?
    • References
      Wikipedia entries:
      internet radio
      internet television
      Web television
      web series
      P2PTV
      streaming media
      online music store
      comparison of online music stores
      list of streaming media systems
      list of online music databases
      comparison of streaming media systems
      video hosting service
      list of video hosting websites
      comparison of video services
      viral video
    • References
      Podcast
      podcast in plain English
      how to create podcasts
       Compression & Codecs
      Audio file format
      Codec
      Lossless comparison
      Web Video Compression and Codecs
      Streaming:
      http://webstreamer.doit.wisc.edu/StreamTutorial/tutorial6/player.html; http://www.adobe.com/devnet/flash/learning_guide/video/part02.html
      http://www.mediacollege.com/video/streaming/server.htmlhttp://www.streamingmedia.com/article.asp?id=8456&page=1&c=11
      http://www.microsoft.com/windows/windowsmedia/compare/WebServVStreamServ.aspx
      Neilson:
      http://www.useit.com/alertbox/990808.htmlhttp://www.useit.com/alertbox/video.html