Huawei 9000 VCT V100R011 Administrator's Manual page 199

HUAWEI 9000 HD Video Terminal
Administrator Guide
H.263
H.264
H.320
H.323
half-duplex
hang up (site)
HD
hide video
Issue 09 (2012-09-03)
H.263 is a video codec standard originally designed as a low-bitrate compressed format
for videoconferencing. It was developed by the ITU-T Video Coding Experts Group
(VCEG) in a project ending in 1995/1996 as one member of the H.26x family of video
coding standards in the domain of the ITU-T. H.263v2 (H.263+) added support for
flexible customized picture formats and custom picture clock frequencies. Previously
the only picture formats supported in H.263 had been Sub-QCIF, QCIF, CIF, 4CIF, and
16CIF, and the only picture clock frequency had been 30000/1001 (approximately 29.97)
clock ticks per second.
H.264/AVC/MPEG-4 Part 10 (Advanced Video Coding) is a standard for video
compression. The final drafting work on the first version of the standard was completed
in May 2003. H.264/AVC is the latest block-oriented motion-compensation-based codec
standard developed by the ITU-T Video Coding Experts Group (VCEG) together with
the ISO/IEC Moving Picture Experts Group (MPEG), and it was the product of a
partnership effort known as the Joint Video Team (JVT). The ITU-T H.264 standard and
the ISO/IEC MPEG-4 AVC standard (formally, ISO/IEC 14496-10 - MPEG-4 Part 10,
Advanced Video Coding) are jointly maintained so that they have identical technical
content. H.264 is used in such applications as Blu-ray Disc, videos from YouTube and
the iTunes Store, DVB broadcast, direct-broadcast satellite television service, cable
television services, and real-time videoconferencing.
H.320 is an umbrella recommendation by the ITU-T for running Multimedia (Audio/
Video/Data) over ISDN based networks. The main protocols in this suite are H.221, H.
230, H.242, audio codecs such as G.711, and video codecs such as H.261 and H.263.
H.323 is a recommendation from the ITU Telecommunication Standardization Sector
(ITU-T) that defines the protocols to provide audio-visual communication sessions on
any packet network. The H.323 standard addresses call signaling and control, multimedia
transport and control, and bandwidth control for point-to-point and multi-point
conferences.
A transmitting mode in which a half-duplex system provides for communication in both
directions, but only one direction at a time (not simultaneously). Typically, once a party
begins receiving a signal, it must wait for the transmitter to stop transmitting, before
replying.
Hang up a remote site and remove the site from the conference.
Refers to a video system of higher resolution than standard-definition (SD) video, most
commonly at display resolutions of 1280×720 (720p) or 1920×1080 (1080i or 1080p,
full HD). High definition (HD) refers to an the increase in display or visual resolution
of television formats (HDTV), high definition video (used in HDTV broadcasting, digital
film and computer HD video film formats), high definition multimedia interface
(HDMI), an all-digital audio and video interface capable of transmitting uncompressed
streams and other formats for recording and transmitting visual and audio
communications.
During a conference, a site can hide its video to prevent other sites from viewing the
video of the site.
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