Transcript Audio and Video - School of Information

Audio and Video
David Zepeda
Information Architecture and Design I
Fall 2005
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Vocabulary
Audio Formats
Video Formats
Media Players
Audio and Video on the Web
Future of Audio and Video
Vocabulary
Codec: COmpresor/DECoder an encoding
algorithm that compresses and optimizes
audio/video for digital transmission
Vocabulary
Lossless Compression: type of compression
that squeezes/stuffs data into smaller sized
data packets without permanently discarding
information
Lossy compression: type of compression that
intelligently discards data to achieve smaller
file sizes, permanently discarding
frequencies deemed unnecessary
Vocabulary
Streaming Media: Media that is consumed while it
is being delivered.
HTTP Streaming / Progressive Streaming:
Download-and-Play method takes a compressed
media file and downloads it to your computer's
hard drive before playback.
Real Time Streaming
Real-time streaming is broadcast to your
computer directly from a server and played back
as the information is received from the server,
without waiting for the file to download.
Audio Formats
File Type
Extensions
AIFF (Mac)
.aif, .aiff
WAV
.wav
MP3
.mp3
Windows Media Audio
.wma
QuickTime
.qt
RealAudio
.ra
ACC - Advanced Audio Coding .MP4
Video Formats
File Type
Extensions
Moving Picture Experts Group .mpg, .mpeg
(MPEG)
Quicktime
.mov, .qt, .movie, .moov
Audio Video Interleaved
.avi
Windows Media Video
.wmv
RealMedia
.ram, .rm
DivX
.divx
Media Players
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Windows Media Player
iTunes
Quicktime
Real Player
Flash (.swf)
DivX Player
Audio and Video for the Web
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Don’t use it if you don’t need it
Only use it when expected
If you use it, explain how
Offer alternative formats if possible
Use Audio and Video to instruct and
entertain
Examples
http://www.thefray.net/
http://www.thefray.net/header.swf
http://www.davidgarza.com/downloads.html
http://www.netflix.com/
http://www.amazon.com/
http://www.ischool.utexas.edu
http://www.idrivesafely.com/
Future of Audio and Video
• Take it anywhere: iPod, Podcasting, PSP, Cell
Phones, and PDAs
• Emmy for ACHIEVEMENT IN CONTENT FOR
NON-TRADITIONAL DELIVERY PLATFORMS
This award will be given in recognition of
editorial content and video production creativity
in original material created primarily for
consumption on non-traditional viewing
platforms such as computers, mobile phones,
PDAs and similar devices
Resources
• http://www.emmyonline.org/index.html
• http://whatis.techtarget.com/fileFormatA/0,
289933,sid9,00.html
• http://support.microsoft.com/?scid=kb;enus;q316992
• http://www.apple.com/quicktime/player/spe
cs.html
• http://www.uwm.edu/~elsmith/videofileform
ats.html
Resources
• Barfield, Lon. (2004). Design for new media : interaction
design for multimedia and the Web. Harlow, England ;
New York : Pearson/Addison Wesley, 2004.
• Beggs, J. and Thede D. (2001). Designing Web Audio.
Beijing ; (Cambridge, Mass.) : O'Reilly, c2001.