Extra Information

Appendix B: Terms and Acronyms
102 ViewCast
Term Acronym Definition
Dynamic Host
Configuration
Protocol
DHCP
• A protocol network devices (clients) use to obtain the
parameters necessary for operation in an Internet protocol
(IP) network.
• It reduces system administration workload by allowing users
to add devices to the network with little or no manual
configuration.
Encoder
• A hardware device or software that changes a signal (such as
a bitstream) or data into a code.
• The code may perform such actions as compressing
information for:
— Transmission or storage
— Encrypting or adding redundancies to the input code
— Translating from one code to another
• Examples include:
— Compressing audio/video into a smaller form
— Multiplexing to combine inputs into one output
— Functioning as a rotary encoder to convert rotary
position to an analog electronic signal
— Functioning as a linear encoder to convert linear
positions to electronic signals
Flash
• Also known as Adobe Flash.
• A set of multimedia software originally created by
Macromedia and currently developed and distributed by
Adobe Systems.
• Since its introduction in 1996, Flash has become a popular
method for adding animation and interactivity to web pages
• Developers commonly use Flash to create animation,
advertisements, and various web page components, to
integrate video into web pages, and more recently, to develop
rich Internet applications.
Frame rate The number of video frames processed per unit of time, usually
frames per second.
Frame size The pixel width and height of video image.
Key frame A full frame of compressed video that the decoder uses as a
reference frame of video for subsequent delta frames.
Lossy
Compression
• An encoding or compression method that eliminates
redundant and unnecessary data in a file to compress it more
tightly.
• It occurs to data that you compress and then decompress to
retrieve data that may be different from its original but still
close enough to use.