Don't Be Stumped By DVD Standards
It all comes down to application formats, writable formats and DVD
drives
DVD is the hottest thing to hit consumers, well, ever.
Consumers are snatching up DVD movies like Shrek in record numbers, and even
moribund TV series like "Twin Peaks" and "M*A*S*H" are finding new life as
DVDs. Home DVD players are selling at a faster rate than the radio, Internet
or even television was adopted. Virtually all new computers come with a DVD
drive allowing tens of millions of consumers the ability to play DVDs on a
computer. But the biggest change is yet to come.
2002 is the year a
number of manufacturers have released, or will release, DVD burners,
allowing consumers the ability to make their own DVDs with a computer for
the first time ever. However, intrepid DVD creators should proceed with
caution. DVD is a new technology and not all devices support the same
standard. In fact, there are a number of competing formats for creating your
own DVDs, making it possible that the DVD you create on your computer may
not play in your living room. This article will arm you with the information
you need to know to keep that from happening. But pay close attention, in a
moment the acronyms are going to start flying around like a box of nails
caught in a tornado.
The easiest way to understand the subtleties of
DVD technology is to divide the discussion into three parts: application
formats, writable formats and DVD drives.
Let's begin with
application formats. The good news is that every DVD movie that you buy or
rent is in a single application format called DVD-Video. All DVD players and
DVD drives can play DVD-Video. Now the bad news: You might create your own
DVD-Video movie and it might not play in your DVD player. Sounds odd,
doesn't it? Let's move on to writable formats. Although DVD disks look like
CDs, they are not the same thing. The biggest difference is that a DVD can
hold much more information than a CD. Most CDs hold 650 or 700 megabytes of
data, movies or music. Most DVDs hold 4.7 gigabytes, or about seven times
more information than a CD. This extra capacity allows entire Hollywood
movies to fit on a single disk. If you want to create your own DVD movie,
you will need to get a writable version of one of these DVD disks. This is
where it starts to get complicated.
Imagine if there were five
different kinds of VHS tapes and they all looked identical but were not --
that is basically where the DVD standards world is right now. There are
essentially five versions of writable DVD that you need to understand. They
are: DVD-R, DVD-RAM, DVD-RW, DVD+RW and DVD+R. The distinctions are actually
based on how the data is written to and read from the disk, and this
differentiation is difficult to translate to the physical world, however one
example might be language.
Imagine if the entire world agreed on a
single language for all written documents, say English. In the United States
we would continue to create English documents and books in which one reads
left to right. But another country might prefer to write and read English
right to left. And yet another, top to bottom, and so on until the effect
became that although all documents were created in a single language, it
would be very difficult for a person from one country to read a document
from another country. DVD recording is in a similar state of confusion. DVD
is such a nascent technology that these issues have yet to work themselves
out, so you have no choice other than understanding them all. One easy way
to think about the formats is as five completely different kinds of DVD
disks.
First, let's divide the formats up. The first thing to note
is that DVD-R and DVD+R disks can only be recorded once. You only get one
chance to record your DVD movie to this kind of disk It's like pouring
cement, once it is done you'll need to destroy it to change it. Further,
DVD-R discs come in two types: DVD-R(A), for "authoring," and DVD-R(G), for
"general." Both DVD-R and DVD+R discs will play in most DVD players, even
older ones. So if you put your movie on this kind of disk there is a high
probability that it will play in your living room. However, DVD-R(A) drives
can not record to DVD-R(G) disks, and vice versa.
There are also DVD
formats that can be recorded more than once. DVD+RW, DVD-RW and DVD-RAM
disks can all be recorded thousands of times. If you don' t like how your
DVD movie turns out, you can record a new version right on the same disk.
These disks are more like painting a wall -- if you don't like the color you
just put on a new coat. Each of these rewritable formats are a little
different. DVD-RAM, for instance, was created for storage of computer data
-- like backing up your hard drive. If you want to get a DVD writer to back
up computer data, DVD-RAM is a solid option. However, if you plan to make
your own DVD movies, one of the other formats may be better suited for that
activity. Most DVD players can't play DVD-RAM disks.
The DVD-RW and
DVD+RW formats are both good for making DVD movies but are essentially
engaged in a Beta versus VHS-type battle. The consumer market will
ultimately determine which format wins or if they end up combining into a
single standard, but it is important to understand that neither is yet a
universal standard. Another thing to note is that many DVD players won't
play any kind of rewritable disk. Most of the newer players will play these
kinds of disks, but if you have an older DVD player it may not. In general,
the newer your DVD player, the more likely it is to play all the recordable
formats. There are web sites like Apple.com, HomeMovie.com and DVDplusRW.org
that list compatible players and formats, but these are not unabridged
resources either. Use them as a general guide.
That covers the basic
DVD writable formats. The last point of concern is the DVD drive itself.
This is the part of your computer that will actually record your data or
movie onto the DVD disc. Thankfully, if you have made it this far you are
almost home. The different types of DVD drives basically break down into the
same formats as the DVD writable formats. Therefore, there are DVD-RAM
drives, DVD-R drives, etc. on down the line. It is also increasingly likely
that DVD burners will come with the ability to record to more than one
format, for example a manufacturer may offer a DVD+R/RW drive, meaning that
it can record both DVD+R and DVD+RW discs. When considering DVD media (the
actual silver discs) and DVD burners, make sure that both the discs and
drive are the same format.
That is about as simple as it gets, at
least for now. You'll probably want to print out this article and consult it
when you buy your DVD burner, but let's review.
Step one: Decide
what you want to use your DVD burner for. If you want to back up computer
data a DVD-RAM burner is a good choice. If you want to record movies and
music choose another kind of burner.
Step 2: Decide where you will
be watching your DVDs. If you plan to send your homemade DVD movies to
friends and relatives with older DVD players, you will want to make sure you
get a DVD-R or DVD+R burner. If you plan to watch your DVD movies on a
computer or a newer DVD player any format will likely do. Again, these are
general guidelines and there are lots of exceptions. Check the web and do
your homework.
Step 3: Match 'em up. Remember the children's
clothing brand Garanimals? If a shirt had a lion on it, you had to find a
pair of shorts with a lion on it. If you got a Garanimal shirt with a lion
on it and shorts with a fox then they would be different sizes and would not
match. DVD is the same way. You need to make sure that your DVD media and
DVD drive are the same.
All of these DVD acronyms can be pretty
intimidating, but now you know better and as G.I. Joe used to say, "Knowing
is half the battle." Not to mention this is only going to get easier and
easier as the standards work themselves out.
The last point is this:
it is worth it. The learning curve pays off the first time you sit down on
your couch with your remote control and popcorn to watch a DVD that you (or
your kids) made, and the alphabet soup of DVD will give way to the warm glow
of a job well-done. Have fun.
Honda Shing is Chief Technology
Officer for
InterVideo, the company that makes
WinDVD,
the popular software DVD player. InterVideo also makes other audio and video
software and will soon release WinProducer 2 DVD, a program to edit and burn
your own DVDs. |