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58 Glossary
Fast Start A method of delivering a movie so that it can start playing before it is fully
downloaded.
frame A single image in a movie.
frame rate The number of frames displayed per second.
GIF (Graphics Interchange Format) A file format for images.
hint track In a streamed movie, a hint track specifies for the server how the movie’s
content is to be transmitted.
hot spot A place in a virtual reality movie where the user can interact with the movie
using the mouse.
Instant-On A technology that dramatically improves access to streaming content for
broadband users.
JPEG (Joint Photographic Experts Group) A standard for compressing still images.
layer In QuickTime movies, how an image is displayed depends on its layer; images
with lower layer numbers are displayed on top.
MIDI (Musical Instrument Digital Interface) A software and hardware standard set by
the music industry that enables electronic instruments to communicate with one
another and with computers.
MP3 (MPEG-1 layer 3) A format for compressing music.
MPEG-4 An ISO standard based on the QuickTime file format that defines multimedia
file and compression formats.
node In QuickTime VR, a point from which an object or panorama can be viewed.
NTSC (National Television System Committee) The organization that defines North
American broadcast standards. The term NTSC video also refers to the video standard
defined by the committee, which is 29.97 fps, 525 lines per frame, and interlaced.
PAL (Phase Alternation by Line) A video format used by many European countries and
other countries outside North America. The PAL standard is 25 fps, 625 lines per frame,
and interlaced.
PICT A Mac OS picture file format that does not apply compression to an image and
therefore maintains the same quality level from copy to copy.
pixel The onscreen dots that form text and graphics. A contraction of the words picture
and element.
plug-in Software that helps a web browser interpret certain types of media files.