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Capture Devices and Video Encoding Standards

Video Capture and Editing. Capture Devices and Video Encoding Standards. B.Sc. (Hons) Multimedia Computing. Media Technologies. Agenda. Devices Connectivity Compression / Decompression (CODECS) Export formats MPEG-4 Cinipac Sorenson Spark Deployment Support for Legacy Formats.

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Capture Devices and Video Encoding Standards

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  1. Video Capture and Editing Capture Devices and Video Encoding Standards B.Sc. (Hons) Multimedia Computing Media Technologies

  2. Agenda • Devices • Connectivity • Compression / Decompression (CODECS) • Export formats • MPEG-4 • Cinipac • Sorenson Spark • Deployment • Support for Legacy Formats B.Sc. (Hons) Multimedia Computing Media Technologies

  3. Capture Devices • PCI Card (PC) • FireWire port on Mac( Developed by Apple) & PC • USB Port • Video Camera • Web Camera

  4. Connectivity SCART Plugs and Sockets Phono Leads (RCA) Video in Audio in left Audio in right

  5. Connectivity Audio Left (White) Video (Yellow) S-VHS Audio Right (Red)

  6. The Serial Digital Interface ‘Firewire’ • Originally developed by Apple as the IEE1394 Serial Digital Interface • Refereed to as FireWire • Simple and highly efficient method of not only transferring digital signals between devices • Most Camcorders have DVout which can be connected to computer Firewire Port via appropriate lead • Two connector sizes, four pin - Camcorder, and six pin - computer

  7. The Serial Digital Interface ‘Firewire’ • Connection between computer and camcorder enables users to control the camcorder playback • Where suitably equipped DV-in camcorders are present - recording functions using the on-screen controls of the appropriate program

  8. Compression & Decompression ‘CODECS’ • Need CODEC on system to play movie or extract compressed data to load into an editing application ( Premiere) etc. • Some CODECS not well-supported across platforms • MPEG is best for multimedia • Sorenson via Flash MX best solution

  9. Export Formats • Cinepac (Radius) • MPEG • Sorenson Spark • Video for Windows (Indeo) • File types: • avi (Windows) • mpg. (MPEG) • Mov (Quicktime)

  10. Deployment • Compromises required to bring resource requirements of video within capabilities of delivery medium ( e.g networks) and low-end machines • Reduce frame size - down sample to quarter frame size - i.e. 320x240 pixels • Reduce sample rate (12 or 15 fps is OK for smoothmotion, flicker not a problem on computer • Reduce colour depth

  11. Support for Legacy Formats • Betamax • Video 8 • VHS Director Final Cut Video Transfer Interface Devices

  12. References • Digital Multimedia 2nd EditionChapman N. Chapman J. Wiley. 2004 • http://www.cinepak.com/ • http://www.mpeg.org/ • http://www.sorenson.com/ B.Sc. (Hons) Multimedia Computing Media Technologies

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