A S t r e a m i n g M e d i a P r i m e r :
G L O S S A R Y
skin: A custom GUI (graphical user interface) designed
tunneling: The use of specially designed paths to carry
for a specifi c media player.
multicast traffi c over the Internet.
SMIL: Pronounced like smile, SMIL stands for
24 bit color: Type of color representation used by
Synchronized Multimedia Integration Language. Like
current computers. For each of the Red, Green, and
HTML, it is a markup language designed to be easy
Blue components, 8 bits of information are stored and
to learn and deploy on Web sites. SMIL was created
transmitted 24 bits in total. With these 24 bits of
specifi cally to solve the problems of coordinating the
information, over a million different variations of color
display of a variety of multimedia on Web sites. By
can be represented.
using a single timeline for all of the media on a page,
UDP: User Datagram Protocol, like TCP, runs on top
display can be time coordinated and synchronized.
of IP networks. Unlike TCP/IP, UDP/IP provides very
spatial compression: See intra frame compression.
little error recovery, offering instead a direct way to
static media: Refers to design elements that do not
send and receive datagrams over an IP network. It is
incorporate motion or sound such as still photos or
primarily used for streaming over the Internet.
unicast: The technique whereby a single stream is
stream: Data of a distinct type sent from server to
transmitted to a single end user; i.e., each end user gets
client at a rate defi ned by the server. For a typical video
a unique stream. Bandwidth hogging unicasting is not
broadcast, for example, one stream could consist of
as effi cient as multicasting.
the video signal, one stream could consist of the audio
upload: The act of one computer sending data, via a
data, and one stream could contain the closed caption
network, to another computer.
information. In most cases, each stream is served at the
URL: A Uniform Resource Locator is the address used
rate that it should be rendered by the client.
to fi nd a document or resource on the World Wide
streaming: Process of sending media over the Internet
Web. The fi rst part of the address specifi es the protocol
or other network, allowing playback on the desktop
(typically HTTP for Web pages, FTP for fi les not
as the video is received, rather than requiring that the
residing on a Web server, or RTSP for streaming fi les);
entire fi le be downloaded prior to playback.
the second part specifi es the IP address, or domain
SWF: The SWF graphic fi le format is a version of
name; and the rest specifi es the directory structure for
the Macromedia Flash Player vector based graphics
fi nding the discrete fi le on the host computer.
format introduced in 1997. The SWF fi le format is ideal
URL fl ip: A coded marker embedded in the timeline
for presenting vector based interactive and animated
of video or audio that calls up a link to a Web page
graphics with sound for the Web. Vector images are
ideal for graphics with solid areas of color and distinct
video capture card (or board): Installed inside a
object defi nitions. Because a SWF fi le is vector based,
computer, adds the functionality needed to digitize
its graphics are scalable and play back smoothly on
analog video for use by the computer. Using a hardware
any screen size and across multiple platforms. A
or software codec, the capture card also compresses
vector animation usually has a smaller fi le size than a
video in and decompresses video out for display on a
bitmap animation. For more information see the online
Adobe Technical Guides at: www.adobe.com/support/
VOD: Video On Demand refers to streaming fi les that
are archived on a streaming server and may be accessed
TCP/IP: These two protocols (Transmission Control
by an end user at any time, as contrasted with live, or
Protocol/Internet Protocol) were developed by the U.S.
real time, content.
military to allow computers to talk to each other over
long distance networks. IP is responsible for moving
Webcasting: The technique of broadcasting media
packets of data between nodes. TCP is responsible for
over an intranet, extranet, or the Internet.
verifying delivery from client to server. TCP/IP forms
Web server streaming: Yet another term for HTTP
the basis of the Internet, and is built into most every
streaming, pseudo streaming, or progressive download;
common operating system.
see progressive download.
temporal compression: See inter frame compression.
Windows Media: Offered by Microsoft, one of the
timeline: The graphical representation of program
three dominant architectures for distributing media on
length onto which video, audio and graphics clips
the Web, including streaming media.
true streaming: Affording real time access to content
via the Internet or an intranet, true streaming is
enabled by a specialized server application, that relies
on streaming protocols to adjust the rate of transmis
sion to accommodate available bandwidth.
Adobe, the Adobe logo, After Effects, GoLive, Illustrator, LiveMotion, Photoshop, and Premiere are registered trademarks or trademarks of Adobe Systems Incorporated in the United States
and/or other countries. Apple, Mac and QuickTime are trademarks of Apple Computer, Inc., registered in the United States and other countries. Macromedia and Flash are trademarks or
registered trademarks of Macromedia Inc. in the United States and/or other countries. Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corporation
in the United States and/or other countries. All other trademarks are the property of their respective owners.
2001 Adobe Systems, Inc. All Rights Reserved. PN 0000 8/01