Published on Jan 03, 2023
The 1970s witnessed a major revolution in TV studio operations brought about the use of digital video technology. Early digital technology was restricted to so-called digital black boxes. A black box is a device that has analog i/p and o/p ports and performs an essential signal-processing task by using digital technology.
Among the early digital black boxes were time base correctors, frame synchronizers and standard converters.In 1980s witnessed the emergence of digital video tape recorders based on CCCR recommendations. A variety of digital black boxes, such as digital video effects (DVES), graphic systems and still stores, operating in a variety of non correlated and incompatible standards also became available. Digital inter connections between various digital black boxes were thus difficult or impossible. The majority of these black boxes were interconnected with the rest of the analog or digital equipment using analog i/p or o/p ports.
The user was generally unaware or uninterested in the digital incompatibility of the black boxes as long as they performed their intended task and could be interconnected with the rest of the equipment. Compatible digital video equipment was assembled into a digital island, such as an editing suite, using a bit parallel digital video interconnection.
The 1990s were characterized by an intense standardization activity led by the SMPTE. A large variety of video production, distribution and recording equipment with standardized bit-serial i/p or o/p ports has become available, allowing the assembly of all digital tele production facilities using bit serial distribution and interconnection.
Reducing the amount of data needed to reproduce video saves storage space, increases access speed and is the only way to achieve motion video on digital computers. This document looks at digital video and explains some techniques of reducing the storage space needed.
It was in the late eighties that the audio and video industry faced the prospect of saturated markets and over capacity. What was required were new products and services that would captures consumers~ imagination. The data capacity of existing digital storage and their transmission links limited its potential for further exploitation. What was needed were standards that the industry could follow.
This document also looks at one such standard; this methodology was not borne out of the desire for commercial overpowering, but by an independent body that recognized the problems at the time.
After looking at the Moving Pictures Experts Group (MPEG) standard, an objective look at some of its many competitors in the same market place is looked at. Some applications of digital video are presented.
Digital video is not without its problems, many of which arc shared by all digital medium. These problems are discussed to some length.
Setting up to do video editing on the PC is slightly different than it is on the Mac, mainly because many different companies put PCs together. This means that an individual PC may not have all the components required for DV editing. The good news is that these components can be added to the computer. The bad news is that it may be necessary to open up the case and fiddle with the insides, which requires some basic knowledge. Alternatively, there are specialised companies that deal in 'turnkey' PC workstations, or a local computer vendor will be able to install the necessary components into an existing PC for a small fee.
To edit miniDV video on a PC (or Mac) you need an IEEE 1394 connection, often known by its proprietary name of Firewire. (Sony's version, which uses 4-pin rather than 6-pin connections, is called i.Link). This links the camcorder to the computer, enabling the transfer of digital video between the tape in the camera and the hard drive. The computer must have sufficient RAM to edit (128 Mb or more, depending on the program) and a large and fast hard drive (10-20 GB or more, the larger the better) on which to store the captured video
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