Glossary
GLOSSARY
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Privacy-enhanced Electronic Mail. File format used to distribute digital signed certificates. Base64 en-
coded DER certificate, enclosed between "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE--
---"
3G-SDI
Serial Digital Interface (SDI) is a serial link standardized by ITU-R BT.656 and the Society of Motion Picture
and Television Engineers (SMPTE). SDI transmits uncompressed digital video over 75-ohm coaxial cable
within studios, and is seen on most professional video infrastructure equipment. The first revision of the
standard, SMPTE 259M, was defined to carry digital representation of analog video such as NTSC and
PAL over a serial interface and is more popularly known as standard-definition (SD) SDI. The data rate
required to transmit SD SDI is 270 Mbps. With the advent of high-definition (HD) video standards such
as 1080i and 720p, the interface was scaled to handle higher data rates of 1.485 Gbps. The 1.485-Gbps
serial interface is commonly called the HD SDI interface and is defined by SMPTE 292M, using the same
75-ohm coaxial cable. Studios and other video production facilities have invested heavily on the hard-
ware infrastructure for coaxial cable and have a vested interest in extending the life of their infrastructure.
Fortunately, SMPTE recently ratified a new standard called SMPTE 424M that doubles the SDI data rates
to 2.97 Gbps using the same 75-ohm coaxial cable. This new standard, also called 3-Gbps (3G)-SDI,
enables higher resolution of picture quality required for 1080p and digital cinema.
Digital Cinema Initiatives (DCI)
DCI is a joint venture of Disney, Fox, Paramount, Sony Pictures Entertainment, Universal and Warner
Bros. Studios. DCI’s primary purpose is to establish and document voluntary specifications for an open
architecture for digital cinema that ensures a uniform and high level of technical performance, reliability
and quality control. Note that the DCI specification is not a standard. Standards for digital cinema are
the domain of the Society of Motion Picture and Television Engineers (SMPTE). "DCI compliant" is a term
used to describe products that conform to the DCI specification. Products that have been tested per the
DCI Compliance Test Plan (CTP) are posted at the DCI compliance web site. Notably, DCI compliance
does not require compliance to the full set of SMPTE DCP standards. A copy of the most recent DCI
specification can be downloaded from the DCI website (h
ttp://dcimovies.com).
Digital Cinema Package (DCP)
A Digital Cinema Package (DCP) is a collection of digital filesusedtostoreandconveyDigitalCinema
(DC) audio, image, and data streams. The term has been defined by Digital Cinema Initiatives (DCI).
General practice adopts a file structure that is organized into a number of usually multi-gigabyte size Ma-
terial eXchange Format (MXF) files, which are separately used to store audio and video streams, and
auxiliary index files in XML format. The MXF files contain streams that are compressed, encoded, and
encrypted, in order to reduce the huge amount of required storage and to protect from unauthorized use.
The image part is JPEG 2000 compressed, whereas the audio part is linear PCM. The adopted (optional)
encryption standard is AES 128 bit in CBC mode. The newer SMPTE standards are used to conform the
recommendations among different tool vendors and producers. Interop, the legacy DCP standard, is still
required to be supported by DCP players.
DisplayPort
Digital display interface developed by the Video Electronics Standards Association (VESA). This roy-
alty-free interface is primarily used to connect a video source to a display device such as a computer
monitor, though it can also be used to transmit audio, USB, and other forms of data. VESA designed
it to replace VGA, DVI, and FPD-Link. Backward compatibility to VGA and DVI by using active adapter
dongles enables users to use DisplayPort fitted video sources without replacing existing display devices.
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