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  1. Video

  2. Helical Scan Video Helical ???

  3. Helical Scan Video Helical ??? Spiral

  4. Tracks of 1/2” Helical Scan Video Audio (2)VideoControl

  5. Helical Scan Video Audio & control track erase head Full erase head TiltedVideo Drum Audio & control track record head SupplyReel Take-upReel

  6. Helical Scan Video Side view Video Tape Video Head TiltedVideo Drum Top view

  7. VHS VHS-C

  8. 8mm video • official name: Video8 • mainly used with video cameras • small tape size

  9. miniDV • Digital Video (DV) - 1996 • MiniDV - standard for consumer and semiprofessional video production • Features include: • intraframe compression for uncomplicated editing • a standard interface for transfer to non-linear editing systems (IEEE 1394/FireWire) • good video quality, especially compared to earlier consumer analog formats such as 8mm, Hi-8 and VHS-C. • variants on the DV standard • DVCAM(Sony) • DVCPRO ( Panasonic) • high-definition version called HDV, with MPEG-2 for compression

  10. digital8 • Sony - late 1990s. • uses conventional analog Video Hi8 tapes, but records the video signal in digital form using the DV codec. • excellent video and audio quality • Sony is the only company that produces D8 camcorders.

  11. Video Format Advantages

  12. Video Format Disadvantages

  13. Advantages of a camcorder • Camera, recorder, playback all in one • Portable - compact, light, easy to handle • Immediate playback • Good to excellent quality • Can use in low light levels • Affordable • Attach to VCR for copying • Attach to TV for playback

  14. Disadvantages of a camcorder • Cost

  15. Camera operations • Composition • Camera angle • Optical & mechanical effects • Electronic effects • Close-up • Movement • Pan • Tilt • Truck • Dolly • Lens characteristics • Zoom • Telephoto • Wide angle • F-stops

  16. Desktop video production • QuickTime • iMovie (Mac) • Windows Media 9 (WMV9) • Media 100 • Video Toaster

  17. Television Distribution Systems • Portable (VCR, Videodisc, DVD) • Broadcast (Commercial, Public) • Satellite • Microwave • Closed circuit • CATV

  18. Broadcast

  19. Satellite

  20. Microwave

  21. Closed-circuit system

  22. CATV

  23. Video Conferencing • One-way video, two-way audio • Two-way video (PictureTel)

  24. Two-way Video Teleconferencing

  25. Streaming Video • sequence of "moving images" that are sent in compressed form over the Internet and displayed by the viewer as they arrive. • streaming media is streaming video with sound • media is sent in a continuous stream and is played as it arrives • user needs a player, which is a special program that uncompresses and sends video data to the display and audio data to speakers • a player can be either an integral part of a browser or downloaded from the software maker's Web site