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Multimedia & The World Wide Web

HCI 201 Multimedia and the www. Multimedia & The World Wide Web. winny. HCI 201 Multimedia and the www. Popular Video format on web. Windows media Quicktime Realone player Flash movie –best!!! Compressed from avi (raw video and audio file). winny. HCI 201 Multimedia and the www.

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Multimedia & The World Wide Web

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  1. HCI 201 Multimedia and the www Multimedia & The World Wide Web winny

  2. HCI 201 Multimedia and the www Popular Video format on web • Windows media • Quicktime • Realone player • Flash movie –best!!! • Compressed from avi (raw video and audio file) winny

  3. HCI 201 Multimedia and the www Types of web video • Downloadable - like *bath* • Progressive downloading, part of it is downloading while part is playing, like most movie trailers. (usually just embed your movie inside html) • Real time streaming, like *shower* (delivered via certain server) • Live webcasts – live camera connect to web. winny

  4. HCI 201 Multimedia and the www Capture • If ur video is shot with dv camera, it’s just like transfer files from one disk to another. • If ur video is shot with analog camcorder, you need to digitize it first (capture cards) winny

  5. HCI 201 Multimedia and the www Video on web • Key is compression • Make it small movies - Eliminate information as possible winny

  6. HCI 201 Multimedia and the www Compression • Compress movie by using ENCODER • Encoder! – reduce the data rate of ur movies • How: Analyze each pixel in your movie and decides what to throw out and what to keep based on the settings you choose. • Your choices depend on: - the video you’ve shot - target audience - connection speed winny

  7. HCI 201 Multimedia and the www Compression 4 parameters: • Frame rate 15f/s for web • Frame size, eg: 320*240 • Spatial quality -intraframe compression, removes redundant info within individual frame • Temporal quality -interframe compression, remove information that repeated over time. winny

  8. HCI 201 Multimedia and the www Human eyesight We r more sensitive to the changes in luminance/brightness than chrominance/color So most video codecs: Throwing out much of the color info, or doing color averaging winny

  9. HCI 201 Multimedia and the www Audio setting Popular setting: Rate: 22,050 hz (higher: 44,100) Format: 16-bit Mono, (higher: stereo) Compressor: various winny

  10. HCI 201 Multimedia and the www Audio setting Popular setting: Rate: 22,050 hz (higher: 44,100) Format: 16-bit Mono, (higher: stereo) Compressor: various winny

  11. HCI 201 Multimedia and the www Options: Making several different versions of a progressive download movies. winny

  12. HCI 201 Multimedia and the www Embed! <embed src=“***.wmv or ***.mov” Width=“320” height=“256”> Height: video height + control height winny

  13. HCI 201 Multimedia and the www Other attributes Autoplay = true/false Cache= true/false Controller= true/false Loop= false/true/palindrome Bgcolor =##### … winny

  14. HCI 201 Multimedia and the www ActiveX control Plugins– activeX control Self contained software applications that are automatically downloaded and executed by a web browser. winny

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