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Multimedia Concepts: Video Technologies ANALOG
 

Multimedia Concepts: Video Technologies ANALOG

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    Multimedia Concepts: Video Technologies ANALOG Multimedia Concepts: Video Technologies ANALOG Presentation Transcript

    • Multimedia Concepts: Video Technologies ANALOG DIGITAL
    • Analog Video Technology
      • Analog means ?
    • Analog Video Technology
      • Analog Formats
      • Videotape
        • VHS (remember BETA?)
        • 8mm
      • Laserdisc
        • Familiar? Obsolete?
        • Why discuss?
    • Analog Video Technology
      • Videotape
      • Laserdisc
    • Video (Analog Tape)
      • Positives
      • Familiar, common hardware
        • VCRs, players, camcorders
      • Perceived image “quality”
        • Impact of screen size
      • Full color depth (~ 24-bit)
    • Video (Analog Tape)
      • Positives
      • RECORDABLE & erasable
      • Inexpensive hardware & tapes
      • Can be digitized 
    • Video (Analog Tape)
      • Negatives
      • Quality of NTSC (standard N. Am. television)
      • TV vs. Monitor
      • Fundamentally linear
        • Hard to use segments
        • Example (s)
        • Computer control ??
    • Video (Analog Tape)
      • Negatives
      • Limited manipulation
        • Costly hardware to edit
        • Quality loss by generation
      • Distance distribution
        • Limited rapid sharing
        • cf. video conferencing
    • Analog Video Technologies
      • Videotape
      • Laserdisc (Laser videodisc)
    • Laserdisc (Analog) Overview
      • Precursor to DVD
      • Advantages & Disadvantages
      • Laserdisc technology
      • Advanced systems
    • Laserdiscs +/-
      • Advantages
      • Higher video quality
      • Multi-channel sound
      • Double-sided
      • Still frame & special effects
      • Potential for random access
        • Non-linear = hyper
    • Laserdiscs +/-
      • Disadvantages
      • ‘ Special’ hardware
        • Unfamiliar at home
      • Bulky
      • Cost of hardware
        • vs VCR (or DVD)
      • No local recording
    • Multimedia Concepts: Video Technologies ANALOG DIGITAL
    • Digital Video
      • What is it?
      • Most commonly:
        • Analog video – digitized
        • Computer files
      • Newer technology:
        • Original digital video (DV)
        • Bits on a digital tape
    • Creating Digital Video
      • Hardware
      • Analog Digitizing Gear
        • $50 - $1000+
        • Internal, external, both
      • Digital camcorder + IEEE 1394
        • “ Firewire” or “i Link”
      • Many digital ‘still’ cameras
        • Highly variable results
      • PC / web cameras (“golf balls”)
    • Creating Digital Video
      • Software
      • Comes with hardware
      • Capture, then edit
        • Not necessarily same software
      • Varied features, e.g. formats
      • Varied learning curve
        • Match to need & skill
        • iMovie / Movie Maker to Premier
    • Other Digital Video Sources
      • Clip video (CD / Web)
      • Download from web sites
        • Varies by video format
      • “ Screen capture” software
        • Camtasia , CamStudio , etc.
      • Morphing software
      • Animation software
        • Flash , et al – beyond our scope
      • Class web page has links
    • Digital Video Concepts
      • Video = “frames”
        • How many / sec?
      • Apply still image file size concept
      • Video = ++MB
        • Forget KB 
    • Digital Video Concepts
      • Image Size (‘window’ on screen)
        • Pixel dimensions
      • Common Sizes
        • 160 x 120 (‘1/16’)
        • 320 x 240 (‘1/4’)
        • 640 x 480 (‘full’ screen)
        • 720 x 480 (DVD, ‘wider’ screen)
        • What does a viewer really see?
    • Digital Video Concepts
      • DV File Size Factors
      • Image pixel dimensions
        • Just like still images
      • FPS
        • Frames per second
        • Number required?
      • Color depth (bits)
        • Increasingly, no option
    • Digital Video Concepts
        • DV File Size Factors
        • Video (file) format (more later)
          • QuickTime / AVI / WMV
          • MPEG (mpg)
          • Streaming
        • CODEC
          • Compression / decomp algorithm
          • Sometime selectable (cf. audio)
        • Audio quality
          • Limited impact
    • Digital Video Benefits
      • Inexpensive hardware to create
      • Edit electronically with software (non-linear editing)
      • Just another (large) file = transmission potential
        • FTP, email, or on web pages
        • Keep file size down!
        • Or stream it
      • More flexible use
    • Digital Video Issues
        • Image quality (e.g. jaggies)
        • Limited resizing (pixels, jerky)
        • Differing formats / architectures
        • Non-standard compression schemes
          • Broadway AVI & M-JPEG
          • Codec compatibility / availability
        • Storage requirements / downloads
    • Impact of File Size 1 min video can take minutes to download
    • DV Formats
      • QuickTime (mov)
        • Background / compatibility
      • Video for Windows (avi)
      • WMV
      • MPEG (mpg, mp#)
        • Current standard ?
        • Video CD / DVD
      • Streaming competition (later)
        • Real vs MS vs QT
    • ‘ Exotic’ DV
      • VCD (Video CD)
        • Mpeg-1
        • Common outside US
      • QTVR
        • Lighthouse (HS)
        • Orlando Art Museum
    • Other Digital Video Topics
      • Creating digital video
      • DVD
      • Streaming