eScience Lectures Notes : COMP1710 : some remaining pieces of the puzzle
Slide 1 : 1/13 : From New Media to The Web (index.en.html)
COMP1710 Tools for New Media and Web
Last lectures : some remaining pieces of the puzzle
then 'n'ext or 'b'ack
Slide 2 : 2/13 : ToC : COMP1710 : some remaining pieces of the puzzle (tableOfContent.en.html)
Table of Contents (12 slides) for the presentation :
COMP1710 : some remaining pieces of the puzzle
Slide 3 : 3/13 : New Media and Web (intro.en.html)
In this session : some remaining pieces of the puzzle
Slide 4 : 4/13 : Sound : some specificities (sound1.en.html)
Sound : some specificities
But mostly the same thing than the video
For Video or Sound ...
Use QT (inlined or linked) + Another linked format,
possibly open, possibly available on Linux
QT is the more respectful of standard option, but sometimes, standard are
not free (MPEG4 issues)
Video : QT + DivX or MPEG4
N.B. : Future of Video Compression : Advanced Video Coding = H263 = MPEG4
Part10
Sound : QT + MP3 or Ogg Vorbis
Future already there : Advanced Audio Coding = AAC : in MPEG2 and 4 : .mp4
or .m4a
Slide 5 : 5/13 : Type of Sounds (sound2.en.html)
Type of Sounds
Voice
(Use to use the pureVoice Codec in QT, today MPEG4)
Music
(Use to use Sorenson Codec in QT, today MPEG4)
Sound Effect
Slide 6 : 6/13 : Sound : What For ? (sound3.en.html)
Sound : What For ?
Conveying Information
After action from the user
Setting a Mood / Providing personal touch
Capture attention
This should be used carefully ...
Explaining a process
Usually, with a video or animation
Slide 7 : 7/13 : Sound : Recollection from the compression chapter (sound4.en.html)
Sound : Recollection from the compression chapter
Sampling Rate / Digitisation
CD : 44.1 kHz
22kHz Useful enough for most people
Human Voice : 8kHz is enough
Quantisation / Range reduction
Remember Ravel's Bolero
16 or 8 bits x 2 (stereo) or number of channel
From 8 bits to 6 bits ...
Bit Rate : define the quality of the compression (128 kbps for instance)
Other reminder
Download vs Stream
Unicast vs Multicast
Slide 8 : 8/13 : Sound : File Formats the compression chapter (sound5.en.html)
Sound : File Formats / Codec
.aif, .aiff |
Audio Interchage File Format : What you get from a CD |
.au |
Sun Audio / Old Unix word / Lots of it at the beginning of the web |
.mov |
Encapsulation Quicktime, lots of possible codec (mp3, aac ...) 2004
: Version 6.5 |
.mid |
MIDI (Musical Instrument Digital Interface) : Music Score (and more
than just that) |
.ram |
Real Audio Streaming from real Network (N.B. : Recent release of version
10) |
.asf |
Microsoft Window Media Player |
.mp3 |
MPEG-1 audio layer 3 |
.mp4 .m4a .aac |
Advanced Audio Coding |
.wav |
Early DOS windows |
Some Tools
Mac : SoundEdit / SimpleSound / QTPlayerPro
PC : SoundRecorder / CoolEdit / QTPlayerPro
Slide 9 : 9/13 : New Media and Web (ina2006.en.html)
What was chosen by INA.fr in 2006 : 100 000 TV Shows on the net
Format for the free preview
Format |
Vidéo |
Audio |
Quicktime |
MPEG4 SP (mp4) 320x240 pixels
380 kbits/s (340 kbits/s vidéo + 40 kbits/s audio aac mono) |
MPEG2 Layer 3 (mp3)
24kbits/s CBR
joint-stereo 22.050 kHz |
Format for the paid download
Format |
Vidéo |
Audio |
DivX + Watermarking Thomson + DRM DivX |
MPEG4 ASP (avi) 576x 432 pixels
1128 kbits/s (1000 kbits/s vidéo + 128 kbits/s audio mp3 stéréo
48 Khz ) |
MPEG1 Layer 3 (mp3)
192 kbits/s CBR
stéréo à 48KHz |
Slide 10 : 10/13 : From New Media to The Web (spam1.en.html)
SPAM : YOU SHOULD NEVER SPAM
To read : "Spam in Australia", from the Australian Communications Authority
What is Spam ?
Spam is a generic term used to describe electronic ‘junk
mail’ – unwanted messages sent to your email account or mobile phone.
These messages vary, but are essentially commercial and often annoying in their
sheer volume. They may try to persuade you to buy a product or service, or visit
a website where you can make purchases; or they may attempt to trick you into
divulging your bank account or credit card details.
In Australia, spam is defined as ‘unsolicited commercial electronic messaging’.
New Australian legislation relating to spam – the Spam Act 2003 –
came into effect on 10 April 2004. This consumer guide outlines the new law;
it also offers practical advice on how you can reduce the amount of spam you
receive, and suggestions on what to do when you receive spam
Unsollicited mail
Spam according to the Australian Law : Spam Act 2003 – came into effect
on 10 April 2004.
To comply with Australia’s spam laws, a commercial
electronic message must meet the following conditions.
Any message sent to you that doesn’t meet all three of these conditions
is defined as spam:
Consent
it must be sent with your consent. You may give express consent, or consent
may be inferred from your conduct and ‘existing business or other relationships’
Identify
it must contain accurate information about the person or organisation that
authorised the sending of the message
Unsubscribe
it must contain a functional ‘unsubscribe’ facility to allow you
to opt out from receiving messages from that source in the future
A spam message is not necessarily sent out in ‘bulk’ to numerous
addresses – under Australian law, a single electronic message can also
be considered spam.
Exemptions
Electronic messages from certain sources are exempted from the legislation.
These include messages from: government bodies, registered political parties,
charities, religious organizations, educational institutions (sent to attending
and former students and their households).
Slide 11 : 11/13 : Design (design1.en.html)
Design
Slide 12 : 12/13 : The well designed web site (wellDesignedWeb.en.html)
The well designed web site ... "Less is More"
-
Lets the users accomplish their goals
-
Makes its purpose clear
-
Follows conventions
-
Speeds along
-
Displays well in different environments
-
Has some style
Slide 13 : 13/13 : Design and usability by Jacob Nielsen (designJakobNielsen.en.html)
Design and usability by Jacob Nielsen
"Jakob's Law of the Internet User Experience: users spend most of their
time on other websites."
"users left websites after 1 minute and 49 seconds on average, concluding
in that time that the website didn't fulfill their needs."