Video on demand (VOD) or audio and video on demand (AVOD) are systems which allow users to select and watch/listen to
video or
audio content when they choose to, rather than having to watch at a specific broadcast time.
IPTV technology is often used to bring video on demand to
televisions and
personal computers
Internet Protocol television (IPTV) is a system through which
television services are delivered using the
Internet protocol suite over a
packet-switched network such as a
LANor the
Internet, instead of being delivered through traditional
terrestrial,
satellite signal, and
cable television formats. Unlike downloaded media, IPTV offers the ability to stream the media in smaller batches, directly from the source. As a result, a client media player can begin playing the data (such as a movie) before the entire file has been transmitted. This is known as
streaming media.
IPTV services may be classified into three main groups:
·
Live television, with or without interactivity related to the current TV show;
·
Time-shifted television: catch-up TV (replays a TV show that was broadcast hours or days ago), start-over TV (replays the current TV show from its beginning);
·
Video on demand (VOD): browse a catalog of videos, not related to TV programming.
IPTV is distinguished from
Internet television by its ongoing standardization process (e.g.,
European Telecommunications Standards Institute) and preferential deployment scenarios in subscriber-based telecommunications networks with high-speed access channels into end-user premises via
set-top boxes or other
customer-premises equipment.
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