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HD Video
Why
it Improves Your Experience
What
is HD video and why does your television watching experience seem to
come alive with colors and detail that you never experienced before?
HiDef
video is digitally broadcasted video that comes in resolutions that are
far superior to standard television. Standard television
resolution comes in 720 x 480, where 720 is the number of pixels and
480 is the number of lines.
Video in HD is delivered over cable and
satellite. It is dramatically better in quality than standard video,
because there are more pixels per square inch than standard
video.
High Definition video resolution varies,
although common resolutions are 1280 x 720 and 1920 x 1080. You may see
the correlation to numbers that represent HD TVs:
- 1280 x 720: typically indicated by
the 720p – 720 lines of
video
- 1920 x 1080:
typically indicated by 1080i or 1080p – 1080 lines of video
- 720 x 480: typically indicated by
480i or 480p – 480 lines of
video
- “i”:
interlaced video: scans from the top left of the screen
starting with every second line, then repeats from the top left with
the other rows and so forth.
- “p”: progressive scan: scans line by
line from top to bottom
and so forth, eliminating any chance of flickering
HiDef
video is displayed on HDTV’s using a 16:9 aspect ratios. Standard TVs
uses 4:3 aspect ratios resulting in a relatively square TV. Wide screen
videos are shot in 16.65:9 aspect ratios; this is why wide screen
videos look so much better on HDTVs.
The best displays for
HiDef video
are:
Video in HD is delivered at 8 bits per second (bits are eight digital
1s and
0s) right from the transmitting station.
It is slower than
standard video because it is compressed into a smaller bandwidth.
But
the advantage is that this digital video can be transmitted using
several channels at the same over the same line.
This results in a more
detailed, high contrast, and brighter color picture. Saying that
HD is slower is only relative; it still travels at lightning
speeds.
Real-time
steaming of HiDef video is difficult due to bandwidth, although this is
being overcome as technology progresses.
Microsoft Windows Media (MWM)
has the capability to reduce some of the bandwidth restrictions and
provides excellent HD video for computers.
How is HD
video used today? Primarily:
- In the film industry to provide better quality
movies to theaters
- The film industry also uses HD video for DVD
sales
- Businesses use HD streaming video for
distributing proofs and drafts of work to
reviews
- Kiosks in stores and conventions
- Digital signs popping up every for advertising
Everyone wants
their cable or satellite service to provide more HD service for
their viewing pleasure. The problem is that although HD video uses less
bandwidth, its bandwidth is greater than standard video.
The cable and
satellite industries are constrained by older cable installations that
have limited bandwidth capabilities. Both industries are upgrading
their infrastructure rapidly to catch up, however this takes time.
For
additional online
video sharing issues such as the HD video section here, please check out the
related topics; YouTube, Mydeo, Metacafe, streaming video
online, streaming
video live and broadcast
live video.
And
for
more streaming media info, don't
forget to visit the streaming
media hosting, broadband
tv, streaming
server, video teleconference, video
streaming information, digital
media and video
email sections.
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