Sony DVD Rom/DVD Video User Manual download pdf (Page 15)

2. DVD Video

2.3.12 Separate audio

masters, digital

multichannel

audio programs

For DVDs with digital multichannel sound, a separate

audio mastertape is required for each soundtrack.

These should be of either Sony PCM-3324 format,

Sony PCM-800 format or equivalent and must contain

the final mix of the 5.1 channels – front left, front right,

left surround, right surround, centre low frequency

channel – as discrete tracks. The encoding of these

tracks to the specified digital multichannel datastream

is carried out during the DVD premastering process.

2.3.12.1 General

Menus are the key to navigation on a DVD disc. They

allow the user to locate any chapter point on the disc,

change the language for the movie or display subtitles

in any of the languages provided.

Basic menu structure:

Sony DCE has all the equipment and skills required

to prepare menu screens from scratch or by using refer-

ences such as existing artwork (e.g. LD or VHS packa-

ging) for graphics, movie captures for animations, 3D

modelling, Internet convergence, eCommerce integra-

tion and other multimedia applications for DVD.

We therefore will readily accept your order to design the

menu screens for you.

2.3.12.2 Backgrounds

When designing backgrounds, six major issues need to

be addressed. These are Image Size, Safe Area, Colour

Depth, Interlacing, File Format and Naming Convention.

2.3.12.3 Image Size

Computer pixels have an aspect ratio of 1:1. However,

NTSC pixels are 0.9:1 and PAL pixels are 1.0667:1. This

discrepancy causes the menu background to look dis-

torted when exported to D-1 video; NTSC D-1 menus

are compressed horizontally and PAL D-1 menus are

compressed vertically. The menus should be distorted

at design time to counter the effects of TV distortion.

For NTSC the menus should be pre-compressed verti-

cally and for PAL, the menus should be pre-com-

pressed horizontically. To accomodate PAL and NTSC

requirements and to compensate for these known dis-

tortions, the menus for NTSC should be designed

at 720x540 pixels and for PAL at 768x576 pixels.

For NTSC, resize the image to a height of 480 pixels,

keeping the width at 720 and for PAL, resize the image

to a width of 720, keeping the height at 576. At this

point the menus will look distorted on a computer

screen, but this will be compensated for when they are

exported to D-1 or DigiBeta.

Mastertape Channel Content

1 Front left

2 Front right

3 Left Surround

4 Right Surround

5 Center

6 Low frequency channel

MAIN MENU

EXTRA

FEATURES

CHAPTER

SUBTITLE

AUDIO MENU

PAL

NTSC

resize horizontally

resize vertically

768 Pixels

720 Pixels

576 Pixels

540 Pixels

480 Pixels

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Sony DVD Rom/DVD Video User Manual Page 15

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