Your SlideShare is downloading. ×
Download presentation source
Upcoming SlideShare
Loading in...5

Thanks for flagging this SlideShare!

Oops! An error has occurred.

Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Download presentation source


Published on

  • Be the first to comment

  • Be the first to like this

No Downloads
Total Views
On Slideshare
From Embeds
Number of Embeds
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

No notes for slide


  • 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