Glossary of terms
Android
operating system for mobile devices
such as mobile phones, smartphones and
tablets. Android is based on Linux kernel and
the GNU software. Android associates the
large community of developers writing
applications that extend the functionality of
the devices. Hundreds of thousands of
applications are now available for Android
operating system by Google Play platform
(formerly known as Android Market).
DVB-T
the Digital Video Broadcasting
standard that defines modulation and error
correction in terrestrial transmissions. MPEG-2
is used as the transport stream.
E-book
(also: eBook or electronic
publication), e-book - the content stored in
electronic form, intended to be read with the
appropriate software installed on your
computer or tablet.
EPG - Electronic Programme Guide
– a
service that displays detailed information
about current and future programmes on the
television screen.
FTA - Free-to-air
– unencoded radio and
television channels that may be received on
any television set.
Google Play
– Google's online store music,
videos, eBooks and applications designed for
devices running Android operating system.
Google Play is the result of transformation of
Google Music and Android Market in the
unified service.
HD (High Definition)
- Used to describe
video content that is in one of the high
definition video formats. These are broadly
720i/p and 1080i/p. The 720 or 1080 refers to
the number of horizontal lines used to define
the picture and the “i” and “p” refer to
“interlaced” or “progressive scan”. Ordinary,
“SD / Standard Definition” TV used 576 lines
(PAL standard).
Aspect ratio
: The ratio of vertical and
horizontal sizes of a displayed image. The
horizontal vs. vertical ratio of conventional
TVs is 4:3, and that of widescreens is 16:9.
JPEG
: A very common digital still picture
format. A still-picture data compression
system proposed by the Joint Photographic
Expert Group, which features small decrease
in image quality in spite of its high
compression ratio.
XviD
: MPEG-4 based video compression
technology, that can shrink digital video to
sizes small enough to be transported over the
internet, while maintaining high visual quality.
H.264
: is a next-generation video
compression format. H.264 is also known as
MPEG-4 AVC. Developed for use in high
definition systems such as HDTV, Blu-ray as
well as low resolution portable devices, H.264
offers better quality at lower file sizes than
both MPEG-2 and MPEG-4 ASP (DivX or XviD).
H.264 is sometimes referred (erroneously) as
x264 – x264 is the name of a popular
freeware encoder for the H.264 format. H.264
is also sometimes referred to as MP4, again
this is technically incorrect. MP4 is a container
format much like AVI or MKV and it can be
used to “house” many different types of
compression codecs, not just H.264.
Container
. The multimedia container file is
used to identify and interleave different data
types. Simpler container formats can contain
different types of audio codecs, while more
advanced container formats can support
multiple audio and video streams, subtitles,
chapter-information, and meta-data (tags) —
along with the synchronization information
needed to play back the various streams
together. There are many container formats,
such as AVI, Matroska (MKV), MOV, MP4,
OGM, WAV, etc.
17
