DVD Frequently Asked Questions

What is DVDWhat is DVD?
What are the different formatsWhat Are The Different DVD Formats?
Packaging and CasingPackaging and Casing
What are the featuresWhat are the features of DVD Video?
What is regional encodingWhat is Regional Encoding?
What is RCEWhat is Regional Coding Enhancement?
Running TimeWhy is there a difference between the running time of PAL and NTSC films?
Aspect RatioWhat is Aspect Ratio?
Full ScreenWhat is Fullscreen?
Wide ScreenWhat is Widescreen?
Anamorphic WidescreenWhat is Anamorphic Widescreen?
Dolby Digital vs Dolby SurroundDolby Digital vs Dolby Surround?
DTSWhat is DTS?
SuperbitWhat Is Superbit?

What is DVD?

DVD stands for Digital Versatile Disc and it is the latest means of storing information on optical media. In essence it is a bigger faster CD that can hold various information, from video and audio to computer data. DVD aims to replace several different forms of digital media with a single digital format, eventually replacing Audio CD, Videotape, Laserdisc and CD Rom.

DVD has widespread support from all major electronics companies, all major computer hardware companies, and all major movie and music studios. With this unprecedented support, DVD has become the most successful consumer electronics product of all time in less than three years of its introduction.

What Are The Different DVD Formats?

Unlike CDs, DVDs can store data on either side of the disc, while also allowing two layers of data per side. Four combinations are available, with the number depicting the amount of gigabytes that can be stored on the disc: DVD-5 - single-layered single-sided, DVD-9 - dual-layered single-sided (currently the most common), DVD-10 - single-layered double-sided, and DVD-18 - dual-layered double-sided.

Packaging And Casing

There are three basic types of DVD cases. Amaray cases are solid coloured or transparent plastic. Jewel cases (formerly called CD cases, because they look like cases for their audio counterparts) are clear plastic. Snapper cases are made of cardboard with a plastic fastener that clicks closed (hence the name). You will also find that some titles, particularly multi-disc box sets, will be packaged in specifically designed custom cases. We list the case type on all of our new comparisons and are adding them to the older titles as fast as we can.

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What are the features of DVD-Video?

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What is Regional Encoding?

There are 6 Regions assigned to the release of DVDs worldwide. Why?

It is not in the studio's best interest to release a DVD title simultaneously to a worldwide marketplace, as the theatrical release date of a film varies from country to country - this in itself is a topic for much discussion! Therefore, one country's DVD releases often occur close to another countries theatrical release date.

To stop consumers from watching DVDs prior to their country's theatrical release date, regional coding has been imposed.
The regions are:
Region 0: No Restriction: Worldwide availability, plays on all machines.
Region 1: Canada, USA, US Territories.
Region 2: Europe, Middle East (including Egypt).
Region 3: Southeast Asia, East Asia (including Hong Kong).
Region 4: Central America, South America, Mexico, Australia, New Zealand, Pacific Islands, Caribbean.
Region 5: Russian Federation, Africa (not Egypt), North Korea, Mongolia.
Region 6: China.

There are also two other, commercially unavailable Region codes:
Region 7: Reserved. Often used for airlines.
Region 8: Reserved.

Therefore originally, a European consumer who purchased hardware in Europe, would only be able to obtain playback on Region 2 discs. This was so for the first few players available on the market when DVD first became available. The fast pace of technological change has since brought about multi-region players and hardware hacks, allowing consumers to playback discs purchased from other regions.

It is commonly known that many manufacturers of older 'European' Region 2 DVD players can 'chip' or bypass the regional coding, thus permitting the customer to play any disc. The same modification can also be achieved on some players by using a simple 'software hack' via the player's remote control. Check here for more details about your particular player.

At DVD Compare we cater for a worldwide market focusing particularly on American Region 1 discs, British Region 2 discs and Australian Region 4 discs.

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What Is Regional Coding Enhancement?

The latest effort on the studios behalf to halt the usage of multi region players was to introduce 'RCE: Regional Coding Enhancement'

Columbia Tristar and Warner are the first studios to implement this system, but have not issued any official press releases on the subject of RCE. Also, it is important to note that not all DVD titles from these studios will be affected.

The first titles to utilise this enhancement on Region 1 discs include 'The Patriot: Special Edition', 'A Perfect Storm', 'Hollow Man' and 'All The Pretty Horses'. However, hardware manufacturers are finding ways around this problem and some brands are not affected.

Region Coding Enhancment is a signal of Region 2 coding on a Region 1 disc that brings up a screen on multi-region or modified Region 2 players, which may halt the continuing playback of Region 1 material dependent on your hardware. RCE coding allows a disc to detect if a player is 'multi-region' or if a Region 2 player has been altered to playback Region 1 discs. The message that will be displayed on screen is as follows:


If you are unsure if your multi-region or modified Region 2 player will allow playback, we would like to advise you not to purchase any disc which is marked as 'RCE'. Wherever possible we will make a note on our comparisons if an RCE disc is involved but please bear in mind that this information may not be available at the time that the comparison details are input.

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Why is there a difference between the running time of PAL and NTSC films?

Due to a difference in the frame rate between NTSC and PAL releases there will be a slight difference in the running time of the DVDs across the formats. The difference will be approximately 4% so a feature with a US NTSC Region 1 running time of 100 minutes will be shortened to 96 minutes when transfered to UK PAL Region 2. This is completely normal and no scenes have been removed.

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Screen Information

What Is Aspect Ratio?

The numbers for the aspect represent the ratio for the width of a fullscreen or widescreen format in relation to its height. The standard television picture is 4 units wide by 3 units high or ratio 4:3, this is also expressed as 1.33:1 meaning that the width is one and third times the size of the height. It is this second, decimal, method which is used the most.

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What Is Fullscreen?

Fullscreen is the standard Aspect Ratio for television (4:3 or 1.33:1), which means that the width of the screen is precisely one and a third more than the height. Fullscreen films fill the entire screen area of normal televisions and if they are played on widescreen televisions, you will see black bars on each side (right and left) of the screen.

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What Is Widescreen?

A widescreen television has an Aspect Ratio of 16:9 (or 1.78:1). Widescreen is the original size of the theatrical presentation, filmed in various aspect ratios, the format was first introduced around 1950.

In widescreen 'Letterboxed' versions it is normal to see a black strip at the top and bottom of the screen, although its thickness depends on the aspect ratio. The only exception is that if the picture is mastered in the ratio 1.78:1 when the widescreen will be filled.

Two of the most common aspect ratios are 1.85:1 and 2.35:1 which measure the width of the picture in relation to its height. Therefore, the wider the screen (or higher the decimal number), the thicker the black bars will be.

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What Is Anamorphic Widescreen?

The 'Anamorphic Widescreen' technique allows for a superior picture quality, without altering a film's aspect ratio. Knowledgeable DVD buyers often demand it. Consumers new to DVD and even old enthusiasts are still confused by the technology.

Various catchphrases will often be mentioned on the DVD Cases - 'enhanced for 16x9 televisions', 'widescreen 16x9' and '16x9 anamorphic' - these all mean that the disc has been encoded with 'anamorphic widescreen'.

When a DVD says that it is anamorphic, it means that the film has been transferred onto the disc with extra vertical scan lines (a higher resolution), making it ideally suited to playback on a widescreen TV. During playback, the information 'unsqueezes' to stretch across the wide screen, and thanks to those extra lines, the vertical part of the image doesn't lose clarity.

Anamorphic films will always look better on widescreen televisions. Regular TVs will display the widescreen picture as usual, in a letterbox format and ignoring the extra lines, but can occasionally throw up digital artifacts (blocky chunks of colour).

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Sound Information

Dolby Digital vs Dolby Surround?

'Dolby' is a proprietary audio coding technique used in 'analog' formats, developed by Dolby Laboratories for storing and transmitting single or multiple channels of audio. The term 'Dolby' often causes confusion among consumers purchasing DVD discs, as the studios, producers, suppliers, distributors, back cover artwork and retailers describe older DVD discs (or new releases of classic movies) as having 'Dolby' audio. Almost all DVDs contain audio in Dolby Digital format, not analogue; every DVD player contains a Dolby Digital decoder.

'Dolby' formats that you may find listed in the "Sound" section of a DVD's technical details are listed below.

Dolby Mono

Dolby Stereo

Dolby Surround

Surround (Pro Logic)

Dolby Digital Mono

Dolby Digital Stereo

Dolby Digital (Surround)

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What Is DTS?

DTS (Digital Theater Systems) is a different digital audio format also offering 5.1 channels of surround sound abilities, and has been added to the DVD specification as an optional audio format. Some experts say that it sounds better because there is less compression than Dolby Digital, but on most home systems it would be hard to tell the difference. Whether it's better or not, there are only a handful of Region 2 DTS-encoded DVDs available at the moment, although the number is increasing slowly.
Although DTS offers more realistic audio, the soundtrack does take up more space on a disc compared to a Dolby Digital Soundtrack. However, there is still ample space available on the disk to add such features as trailers, commentaries and documentaries.

Unfortunately some DTS-encoded DVDs may be released with fewer (or different) extras than the non-DTS versions. This is simply the decision of the producer of the disc, and not usually the result of space limitations.

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What Is Superbit?

Superbit is a type of disc issued by Columbia Tristar Home Entertainment whereby DVDs do not have special features in order to save room on the disc for the best possible sound and video format.

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