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Transcript

  • 1. Video Terminology
    • Clip: source material for a movie. A clip can be a movie, a still image or an audio file.
    • Frame: basic unit of time
      • NTSC (TV): 30 frames per second (f.p.s.) (29.97 for colour television);
      • motion picture: 24 f.p.s.
    • Digitisation : Capturing information from a video source for use on the computer
  • 2. SMPTE Timecode
    • The Society of Motion Picture and Television Engineers (SMPTE) standard
    • Describes any frame of video in terms of: Hours:Minutes:Seconds:Frames
    • So 01:07:34:16 would be: 1 hour, 7 minutes, 34 seconds and 16 frames
  • 3. “Raw” Formats
    • Different for platforms:
      • QuickTime (MOV) - native to Mac
      • Audio-Video Interleave (AVI) - native to Windows
    • Similar in use and appearance
    • Quicktime has become more flexible and modern (compression, streaming)
    • Special players required to play on opposite platforms
  • 4. Compression
    • Compression: method by which data is restructured or removed to decrease the size of files.
    • Decompression: method by which data is restructured after compression to allow use of the files.
    • CODEC: Compression/Decompression system
  • 5. Why Compress?
    • Video files are typically large
    • Internet is (mostly) a low-bandwidth environment
    • Large amounts of data contained in a video difficult to transmit on the Internet
    • Therefore, compression necessary to move the data effectively
  • 6. Compression Types
    • Lossless compression
      • loses no data but...
      • small size reduction, max 3:1
    • Lossy compression
      • loses information but...
      • much greater compression
  • 7. Compression Formats
    • JPEG: for stills
    • Motion JPEG: a series of still JPEGs
    • MPEG-1:
      • released in November, 1991
      • used with CD-ROMs
      • frame size of 360 x 240 pixels. It has a VHS-like quality.
  • 8. Compression Formats (cont.)
    • "MPEG-1.5":
      • application of MPEG-1 to full-size video
      • "pixel-vision" or "chiclet-vision"
    • MPEG-2:
      • released November, 1994
      • full-motion broadcast video version of MPEG, used by DVD-Video.
    • MPEG-3: never released by the Group.
    • MPEG-4: the HDTV standard
  • 9. MPEG Format
    • Motion Picture Experts Group (MPEG)
      • highly compressed, used on computers and for broadcast applications, MPG extension
      • uses a lossy CODEC
  • 10. MPEG CODEC
    • The MPEG CODEC uses this method: instead of saying “A VERY DETAILED FRAME OF VIDEO” “A VERY DETAILED FRAME OF VIDEO” “A VERY DETAILED FRAME OF VIDEO” “A VERY DETAILED FRAME OF VIDEO” etc. It says: “A VERY DETAILED FRAME OF VIDEO” - KEYFRAME <identical frame> <almost identical frame> “A VERY DETAILED FRAME OF VIDEO” - KEYFRAME <identical frame> etc.
  • 11. MPEG Stats
    • 30 frames per second
    • Audio - CD-quality with full 44 kHz, 16 bit, Stereo
    • Data rate - 140-170 kilobytes/sec or approximately 10 MB per minute
  • 12. Internet Video Basics
    • Video files on the web are either
      • linked from a page
      • embedded in the page
    • Download time depends on
      • file size
      • connection speed
      • general Internet traffic
  • 13. Basics continued
    • For “raw” video, every user has a copy of the video on their system
    • Most common video formats can be played back on a standard system with correct hardware
    • Some older systems require special hardware for MPEG playback
  • 14.  
  • 15. Surf Time! Quicktime and other “raw” video types
  • 16. Incorporating Video Files In Web Pages
    • Standard Link tag: <A HREF=&quot;myvideo.avi&quot;> A video clip</A>
    • EMBED Tag: <EMBED SRC=&quot;myvideo.avi&quot; autostart=&quot;true&quot; width=&quot;176&quot; height=&quot;144&quot;>
  • 17. Streaming Video
    • A number of formats exist today:
      • RealVideo
      • Quicktime Streaming
      • Microsoft MediaStreaming
    • Today we will look mostly at Real
  • 18. A RealVideo Demo http:// ots . utoronto .ca/ audvid /cat.html
  • 19. Creating RealVideo
    • Capture video.
      • Video tape, TV, camcoder, etc.
    • Digitize and edit video.
      • Into a raw (MOV or AVI) format first
    • Encode RealVideo clip.
      • Using RealProducer
    • Deliver RealVideo clip.
      • From web page - linked or embedded
  • 20. Using RealProducer
  • 21. Putting RealVideo on your site
    • Using Wizards in RealProducer
    • Using Dreamweaver
  • 22. Surf Time! RealVideo Sites
  • 23. What is SMIL?
    • The Synchronized Multimedia Integration Language (SMIL)
    • A recommendation from the World Wide Web Consortium (W3C)
    • Allows for the creation of time-based multimedia delivery over the web
    • Based on XML (Extensible Mark-up Language)
  • 24. SMIL
    • Currently supported by RealPlayer G2, other systems are adopting it now (including Quicktime)
    • G2 SMIL includes these media types:
      • RealText
      • RealPix
      • RealAudio
      • RealVideo
      • RealFlash
  • 25. SMIL Examples
    • Sample SMIL File
    • SMIL including Flash animation with synchronized audio and captions
    • SMIL with audio and images created in RealSlideshow
    • Additional Examples
  • 26. RealSlideshow
  • 27. Working on Your Own Site