COS 125 DAY 9. Agenda Assignment #2 Corrected 9 A+’s, 5 A’s, 1 B, 1 C and 1 non-submit Capstone Projects Proposals Due Timing of deliverables is 10%

COS 125

DAY 9

Agenda

Assignment #2 Corrected 9 A+’s, 5 A’s, 1 B, 1 C and 1 non-submit

Capstone Projects Proposals Due Timing of deliverables is 10% of Grade

Today we will discuss Multimedia on the Internet and Begin Shopping and Doing Business on the Internet We complete the HITW text this week and then

concentrate on Web Design (Castro text) for the rest of the semester

Assignments will get harder as the course progresses

Free Music File Sharing

Is it Legal? Moral? Ethical? Define your thoughts

Music & File Sharing

Hottest applications this decade Forced the music Industry to “rethink” its

distribution channels The problem

People buy CD and rip them to MP3s Not a Problem

People places these MP3 in a shareable locations Not a Problem

Other people copy the shared out MP3s Copyright violation! Buying a CD allows personal use and not redistribution

Who’s at fault?.. The person who made the MP3’s or he person that copied them?

Open debate

How KAZAA Works

KAZAA has two types of Computers PC that share out files SuperNodes that keep directories of

“who has what” Any computer that has a Broadband

connection can be a Supernode

How KAZAA works

After you download KAZAA and install You computer broadcast looking for

Supernodes When it find one it uploads your file

information When you look for a specific file you “query”

the supernode The supernodes tells your computer where you

can find the file on someone's else computer You download the file from the other computer

Kazaa Licenses

You agree not to use the Software to:

2.1 Transmit or communicate any data that is unlawful, harmful, threatening, abusive, harassing, defamatory, vulgar, obscene, invasive of another's privacy, hateful, or racially, ethnically or otherwise objectionable;

2.2 Harm minors in any way;

2.3 Impersonate any person or entity or falsely state or otherwise misrepresent your affiliation with a person or entity;

2.4 Forge headers or otherwise manipulate identifiers in order to disguise the origin of any data transmitted to other users;

2.5 Transmit, access or communicate any data that you do not have a right to transmit under any law or under contractual or fiduciary relationships (such as inside information, proprietary and confidential information learned or disclosed as part of employment relationships or under non-disclosure agreements);

2.6 Transmit, access or communicate any data that infringes any patent, trademark, trade secret, copyright or other proprietary rights of any party;

2.7 Transmit or communicate any data that contains software viruses or any other computer code, files or programs designed to interrupt, destroy or limit the functionality of any computer software or hardware or telecommunications equipment;

Kazaa in the media

http://www.wired.com/wired/archive/11.02/kazaa.html

http://news.com.com/2100-1023-920557.html http://www.business2.com/b2/web/articles/0,1786

3,515871,00.html http://www.cnn.com/2003/TECH/internet/09/09/m

usic.swap.settlement/ http://www.pbs.org/newshour/media/medi

a_watch/jan-june04/riaalawsuits_01-21.html

Napster

NapsterIndex Server

2.Search Query

3.Response

1.Uploads List

Of Available FilesWhen Connects

4.Large P2PDownload

File List

List ofAvailable

FilesFrom All

Current Clients

Client PC Client PC Client PC

How Video on the Internet Works

Three methods of delivery Multicast (MBone) Streaming Video Videoconference

Requires webCam

How Streaming Video Works

Same as Streaming Audio Streaming is playing and

downloading a file at the same time As soon as enough of the file has been

downloaded… the applications will begin to play the file and hope the rest gets there in time

Demo from Learn The Net

Video Conferencing

Many Software solutions for Video Conferencing

Netmeeting built into Windows 2000 Windows XP Just add

WebCam Microphone

Works on H.323

WebCams

Small Digital cameras Best ones work on USB 2.0 Avoid Parallel port versions

Used to create videos

Multicast and MBone

Video files and stream tend to be very large What happens when thousands of

people want to see the same video at the same time

Video 100MB * 10,000 viewers We need 1000 GB of band width at the

source of the video A better way?

Think of how cable TV works

Multicasting

What would happen if the server sent one copy of the video file to each location that had users and let the routers make individual copies for each user

Each multicast router copies the files and send copies to each network that requires the file

Source only has to send one file Multicast routers handle the individual users

Unicast ---------------------Multicast

Virtual Reality

3-D illusion in 2-D space Requires special plug-ins or browser

How VRML works

VRML code is plain (ASCII) text. The code describes object(s) attributes, such as, geometry,

size, color, textures and location within the virtual world. In order to view VRML scenes you must have a VRML capable

browser. Usually an add-on plug-in or a browser designed for VRML.

When a user encounters VRML on a website the browser receives instructions from the server on the other end.

The server sends VRML code to the user's browser. The VRML viewer then interprets the instructions and displays the scene.

Downloaded VRML text files are interpreted locally, on the users computer, by the VRML player and rendered in real-time by the CPU.

The files range in size from under 100 kb to several megabytes, so bandwidth directly effects download or access time.

Once the world is loaded, the user's experience is dictated by the CPU performance. High performance processors allow faster and smoother navigation through VRML world

Animations on the Web

Animation are still as the began Series of pictures that are slightly different that

are displayed one after another Different ways of accomplishing this

technique on the web Client Pull Server Push Animated Gifs Macromedia Shockwave Macromedia Flash

Client Pull

The clients loads the first picture in the series and sets a timer Then load the second Then the third

Uses special “Meta” refresh tag in HTML

Very Slow example

Server Push

Web Server pushes new pictures in the series to the browser Only works in Netscape Requires especial server side

programming Nobody uses it any more

Animated Gifs

Probably the easiest way to create an animation Lots of free tools available

http://www.mindworkshop.com/alchemy/alchemy.html

http://www.jasc.com/download_4.asp? We will be using Paint Shop Pro in this

class Example

http://perleybrook.umfk.maine.edu/classes/cos125/samples/aGif.htm

Macromedia

Macromedia Software Shockwave Flash

These are classes all by themselves Examples

http://perleybrook.umfk.maine.edu/samples/umfkLOGo.html

http://www.cyberdimmensions.com/flash/presentation.html

http://www.cyberdimmensions.com/flash/weis_l9_rocketlaunch6.html