Multimedia Concepts: Video Technologies ANALOG

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Multimedia Concepts: Video Technologies ANALOG

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

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