 |
|
|
||||||||||||||||||||
 |
||||||||||||||||||||||
|
||||||||||||||||||||||
 |
||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
The Entertainment Merchant Association |
|||||||
|
High Definition Disc Resource Center |
|||||||
|
High Definition Disc Media 101 - A Non-Technical Primer (First Printed August 2005, Last Revised February 2008)
CONTENTS 2. How is a High Definition Disc different? 3. Why High Definition Discs Now?
When most people in the home entertainment business think of a DVD, they think of movies. In fact, the most popular use of the DVD format is to release movies to the consumer. However, a DVD isn't a movie. It's merely a "portable storage medium". It's no different from a floppy disc you used to use in your computer, a "music" or data CD, or the memory card that you use in your camera or mp3 player - except that it holds more data or information. The biggest difference between a DVD and all of the other storage formats is its capacity. Capacity is important because a 2 hour movie, using current compression methods (explained later in this primer), requires nearly 5 gigabytes (GB) of storage. Before DVD, none of the other forms of portable storage medium would hold a full movie. The old floppy discs of yesterday held 1.44 megabytes of data. One thousand megabytes equals approximately one gigabyte. So, it would have taken 3,500 floppy discs to hold a movie which could be played back in the quality of a DVD. It was possible, but not practical. A CD, like the one used either for storage for your computer files or the ones you buy commercially with music (both are technically the same), holds 650-700 MB of data. This storage level is fine for a music album, which in WAV format (which is the audio format that plays in your car or home CD player) holds over an hour of music. But, about 7 CDs would be needed to hold a 2 hour movie compressed in the same quality as a DVD. It's possible, but still not practical. (There are compression techniques that allow a full-length movie to be stored on a CD. This is how VCDs are produced - which are popular on the underground market in Asia and available around the world. However, the quality of playback of a VCD is comparable to that of VHS.) DVDs (Digital Versatile Discs), in their basic state, hold 4.7GB of data each. One DVD equals about the same amount of storage capacity as 6½ CDs, and has capacity for just under two hours of video - enough for most movies. In order to release movies which were two hours or more, and so that "extras" could be included, some movies were released on a set of two DVDs and, midway through a movie, the discs had to be switched. This problem was solved when disc capacity was doubled and even quadrupled by creating discs with a "flip side" and discs with second layers. (Back in late 1999, the first of few double-sided, double layer disc movies (called DVD-18 because it held about 18GB of data) was released - Steven King's The Stand. Pressing a DVD-18 was much more complicated, and only a few replicators were prepared to go into production. Production costs were very expensive, and there were a lot of defective discs. So, this concept was abandoned as a standard for increasing capacity.) A double-sided, single layer disc or a single-sided, double layer disc (the most common format released commercially today) holds 8.5GB - enough for a movie over three hours long with plenty of extras (which are usually produced at a much less space-intensive compression rate).
How Is A High Definition Disc Different? High definition discs takes the next giant step toward increased capacity. How? In each computer or DVD player is an optical reader (which you call the "CD-drive" in your computer). The optical reader emits a laser which is used to read the information on the disc. The standard reader is known as the "red laser", and it reads CDs and today's DVDs. High-definition discs require more capacity on the same size disc. The laser needs to read a tighter line of information on the disc. (Think of the LPs or phonograph records "of old". Basically 78 RPM records and 33 1/3 RPM records were the same size. But, the grooves were thinner on the 33 1/3 records, allowing for more information to be written on the disc.) High-definition disc optical readers use a "blue laser" which emits a shorter wavelength than "red laser" and can focus on that tighter line. The capacity on a single layer high-definition disc is either 15GB or 25GB (depending on format). Some movies have already been released on dual layer or dual side discs, and there's talk about multiple layer discs in the near future. In fact, Sony has announced that by the end of 2008 they'll be able to launch an eight layer disc with capacity of 400GB! Storing a two hour movie (at the same level of compression and definition as a high-definition TV broadcast) will take about 20GB of space. So, plenty of space will be left over on the disc for extras and interactivity. Some movies will have multiple endings, and some even multiple story lines. The viewer will have the ability to surround the movie picture with "tickertape comments" or other information that adds to the enjoyment or appreciation of the movie. With many gigabytes of storage left over, opportunities are endless.
Why High Definition Discs Now? There are a number of reasons that high definition discs were released to the consumer market early 2006. First, the consumer electronics companies arenā't making a lot of profit from standard definition DVD players (which are being retailed as low as $15). They need something new to sell. Second, high definition discs will offer better copy protection from digital piracy. Encryption will be more advance and dynamic. Pirated copies may be traced back to the manufacturer. And, uploading or downloading a 20GB movie over today's internet bandwidths will make P2P sharing extremely difficult. Third, high definition televisions are being purchased in more and more homes in the US. The FCC has mandated that all televisions sold starting in March of 2007 have tuners capable of receiving high definition content, and has also mandated that all television stations stop broadcasting analog signals by February 2009. So, the number of high definition TV households will continue to grow, and is anticipated to reach 21 million by the end of 2006 and 180 million (81%) by 2011. Once consumers view a high definition signal on television, most will really see the difference - it's even much better than viewing a standard DVD on a high-definition TV. Consumers with high definition TVs search for content which they can watch in high definition. If the only way that they are able to view a movie in high definition is to watch in on Pay-Per-View or Video-On-Demand, they'll probably try it. This could become the "killer application" that draws consumers to these delivery options - if the alternative of high definition discs for sale and rental isn't available.
Two formats of high definition discs had been developed and initially released: HD-DVD and Blu-Ray. Sony has developed the Blu-ray technology, which is endorsed by Hitachi, LG, Matsushita, Mitsubishi, Pioneer, Phillips, Samsung, Sharp and Thompson. Toshiba and NEC developed HD-DVD. These two formats were not compatible - that is, a Blu-ray disc won't play in an HD-DVD player and vice versa. Why two formats? It's all about licensing fees. Neither patent holder wanted to give up the huge revenue stream they'll receive in licensing if their technology succeeds. (Sony, along with Phillips, controlled the underlying patent for the CD format, but not for the DVD format which is primarily based on technology developed by Toshiba and Time Warner. Sony presumably didn't want to lose the future revenue stream from high definition discs.) In February 2008, following Warner Home Entertainment's decision not to release product on HD DVD, and after announcements that Netflix and Wal-Mart would discontinue carrying HD DVD and that Best Buy had defined Blu-ray to their consumers as the format of choice, Toshiba announced that it would no longer manufacture HD DVD players. This chart compares the two formats as of this writing for historical purposes. The attributes change quickly, though.
Both formats have released in very limited supply and distribution during their initial launch phase. Studios and consumer electronic manufacturers are projecting that distribution will expand and sales will grow during Q4 2006. Some retailers, during this early phase are supporting both hardware and software, some have chosen not to, and a small number have chosen to sell software and not hardware. Neflix initiated rental of all high definition titles from the first release date. Each retailer needs to develop its own strategy and make an independent decision regarding its support for high definition discs. EMA will continue to provide information to help make those decisions. EMA will keep its members informed with updated developments regarding high definition discs. This information will be available by email as well as on the web. Click here to review this area of our website.
Entertainment Merchants Association © Entertainment Merchants Association
|
|||||||