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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 l.jpg

HCI 201 Multimedia and the www

Multimedia & The World Wide Web

winny


Popular video format on web l.jpg

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


Types of web video l.jpg

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


Capture l.jpg

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


Video on web l.jpg

HCI 201 Multimedia and the www

Video on web

  • Key is compression

  • Make it small movies

    - Eliminate information as possible

winny


Compression l.jpg

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


Compression7 l.jpg

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


Human eyesight l.jpg

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


Audio setting l.jpg

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


Audio setting10 l.jpg

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


Options l.jpg

HCI 201 Multimedia and the www

Options:

Making several different versions of a progressive download movies.

winny


Embed l.jpg

HCI 201 Multimedia and the www

Embed!

<embed src=“***.wmv or ***.mov”

Width=“320” height=“256”>

Height: video height + control height

winny


Other attributes l.jpg

HCI 201 Multimedia and the www

Other attributes

Autoplay = true/false

Cache= true/false

Controller= true/false

Loop= false/true/palindrome

Bgcolor =#####

winny


Activex control l.jpg

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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