Aspect Ratio
Aspect ratio is an image projection
attribute that describes the proportional relationship between the width of an
image and its height. For example, movies, which are usually shot with a
wide-angle lens, have an aspect ratio that is typically 16:9, which means that
the width of the image area is almost twice its height. The traditional
television and computer display, on the other hand, are designed for an aspect
ratio of 1.33:1, which means that the width of the display area is only 1.33
times the height, almost square. The inconsistency between movie and television
aspect ratios has generally meant compromising the size or completeness of the
image when you watch a movie on a standard TV set. Many newer television
displays, such as those using HDTV technology, have a widescreen format with
an aspect ratio of 16:9.
This is a 16:9 shot
This
is a 1.33.1
Composite Video
Composite
video, is the analogue waveform that conveys the image data in a conventional
National Television Standards Committee television signal. Composite video
contains chrominance (hue and saturation) and luminance (brightness)
information, along with synchronization and blanking pulses, all together in a
single signal. In fast-scan NTSC television, a very high frequency or
ultra-high frequency carrier coaxials. Some DVD players and video cassette recorders
accommodate composite video input or output through a phono jack, also known as
an RCA connector in composite video, interference
between the chrominance and luminance information is inevitable, and tends to
be worst when the signal is weak. This is why a distant NTSC television station
at VHF or UHF, received with an old-fashioned whip antenna, "rabbit ears," or outdoor
"aerial" often contains false or fluctuating colours. Compare
S-Video.
Component Video
Component
Video is a video signal that is split into two or more component channels. It
stores information in analogue video into three separate signals.
HDMI Interface
High
Definition Multimedia Interface. Is a hardware that transfer uncompressed video
data and compressed digital audio data from HDML compliant source device. It
provides interface between audio video source, such as a set top box, DVD
player, and video monitor on digital television with a single cable. It also
supports high definition video and multi-channel digital audio on a single
cable. It support 8 channels which transmit on ATSC HDTV standards. It
digitally replaces existing analogue video.
PAL
Phase alternating line is a colour coding system for analogue
television which is used in broadcast television system. It broadcast at
625-line/50 field (25 frame) per second (5761)
NTSC
NTSC is responsible for setting Television and video
standards. The NTSC standard for television defines a composite video signal
with a refresh rate of 60 half frames (interlaced) per sec each frames contains
525 lines and can contain 16 million different colours. It’s is incompatible
with most computer video standard, which generally use RGB video signals.
However, you can insert special video adapters into your computer that converts
NTSC signals into computer video signals
Satellite is a television system that supply television
programme using broadcasting signals that relayed from communication satellites
signals through a satellite dish. On the other hand, Cable is delivered
television programme to pay subscribers, the signals is transmitted through coaxial
cables it can also transmitted by light pulses through fibre optic cables.
Internet TV is the digital distribution of television content watch on the
internet. In addition to this, can watch video through by video streaming
technology. These days you don’t need
cable service to keep up with your favourite TV shows, some TV shows are
available online. Can also watch internet TV on Netflix and YouTube. Many
nations are making big strides toward the implementation of Digital Terrestrial
Television. Digital signals provide improved reception quality, ability to
broadcast high definition, expanded channels line ups and enhanced multimedia
applications such as video on demand and entertainment services.
The
Advantages of Digital Video Recording and Editing
The greatest advantage of a DVR is that it provide you with the
flexibility, simple operation, and makes sure you do not miss a moment of your
favorite program. Because it’s constant recording, you can pause/rewind live TV
and replay favorite moments. Digital editing software allows you to use your
computer to edit video and audio. It also allows you to upload video footage
into a computer in a process called video capture. Can place clips on a
particular point on the timeline, insert a clip between two existing cliffs,
shuffle clips around. You will not miss
your favorite programed as the DVR will continue to record even if you rewind
or replay scenes. It also allows you to schedule the recording of programs up
to two weeks ahead of time.
H.264 is a new video codec standard which can achieve high quality video
in relatively low vibrates. It stream video application in real time, at rates
ranging from one quarter to half the file size of previous video formats.
MPEG.4 this is under development for multimedia content distribution networks,
it contains specifications for audio, video and interactivity. It provides good
image quality at low data rates but is still in development.
In order to undertake good quality video footage you must ensure focus,
composition, sound, sound is check to ensure that the sound is there when
recording, check must check to ensure that the video quality is good and the
white balance is right. In addition to this you do this by check the light and explore
the light if is too dark or too light, use a white blank white paper to
determine which lighting to when recording. In addition to this, This is done
by checking the white balance, the focus, composition and sound need to check
the microphone. Also, have to make sure the video is in focus to ensure that
you capture good quality recording.
