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Friday, November 15, 2013

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Source:- Google.com.pk

High Definition Video

All high definition formats use a nonanamorphic, 16:9 aspect ratio using square pixels, just like a computer display. Despite these similarities, there are many high definition video formats.

The different frame sizes, frame rates, and scanning methods serve different markets, both domestically and internationally. For example, the availability of the 720p format is a result of needing a lower-resolution format, so that current standard definition programming can be blown up more easily. It is also seen as a format suitable for programming that would not benefit from additional resolution, such as local news. For broadcast, bandwidth is a critical issue, and the larger resolution of 1080 video takes up valuable room on the broadcasting spectrum as well as on the available bandwidth of cable and satellite services.

As you can see in the previous table, each high definition standard supports numerous frame rates. These can be divided into two categories:

Frame rates for film production and post-production

Frame rates for broadcast video applications

Frame rates intended for broadcast video use can be interlaced, similar to standard definition video on a television, or progressive like a computer display.

A number of online video streaming/on demand and digital download services offer HD video, among them YouTube, Vimeo, Hulu, Amazon Video On Demand, Netflix Watch Instantly, and others. Due to heavy compression, the image detail produced by these formats are far below that of broadcast HD, and often even inferior to DVD-Video (3-9 Mbit/s MP2) upscaled to the same image size.