High-definition video production is increasing rapidly, as its installed base of high-definition-capable displays growing at a same pace. A significant amount of this content will be delivered via the internet.
HD source formats are always in 1920 x 1080 resolution or 1280 x 720 resolution:
- The 1920 x 1080 resolution, considered to be true HD, contains 2.25 times more pixels than 1280 x 720 resolution at the same frame rate.
- This difference substantially increases requirements for processing contents in terms of encoding time, decoding speed, and storage.
There is a substantial difference exist between the 1080 and 720 standards:
- The 720 formats are all progressive.
- The 1080 format has a mixture of progressive and interlaced frame types.
Computers and their displays are essentially progressive. HD frame rates are 24, 25, 30, or 60 fps, frame rates also have a substantial effect on performance. Video formats are either 8-bit per channel or 10-bit per color channel. The 8-bit formats have 256 steps from black to white, and 10-bit has 1024 steps.
The HD industry uses a variety of digital recording formats for professional HD production. These formats use the existing standard definition formats, but with new compressed bit streams. Playing back HD content onto the computer can require large quantities of fast storage. Although there are significant differences between digital formats, uncompressed data rates are many, many times higher than the rate for a typical file compressed for HD delivery. HD requires so much storage, editing an offline version at standard definition and then only capturing the required sections in HD for finishing, can be a great option. Although 250-GB hard disk can now be purchased, but a single disk can quickly become too small. Here, a multidisk RAID solution is recommended.
When we refer to the searching and sharing HD video file we must consider above mentioned factors, the primary hindrance in the path is the problem of storage for such files on the net. Although many sites are coming forward with HD video contents, but the number is limited. As far as searching of HD contents on the web is concerned, this should not pose any problem as the HD files would be using the extensions like *.WMV HD and .QTL. Many video sharing sites have already sensed the future capability and demand of the HD video files and some of them like Vimeo have already taken the initiative and going to add HD video section shortly in their range of services being offered.
The future of HD video sharing would greatly depend on the experience of these sites. Hopefully the problem of size of the files and the storage requirements would be tackled with the continuously developing technology. In the present scenario, this problem is being tackled by way of properly optimizing the videos. However HD video promises us a great future ahead for which people are waiting eagerly and patiently.
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