User Guide

ADOBE ENCORE DVD 2.0

User Guide

Sample budget #2

Proceed as follows for bit budgeting of a 120-minute video with three audio tracks, two subtitle tracks, two motion

menus, and a one-minute movie preview to be burned to an 8.54 GB disc:

1 Calculate the total available disc space in bits. An 8.54 GB (gigabyte) disc contains 8,540,000,000 bytes; each byte

contains 8 bits. 8,540,000,000 x 8 = 68,320,000,000 bits = 68,320 Mbits.

2 Calculate the disc space available for video. Combine the size of the audio, subtitles, motion menus, movie

preview, and 4% of the disc capacity (for overhead, just to be safe) and then subtract that sum from the total available

space you calculated in step 1.

• Three 120-minute audio streams, two with a data rate of 0.192 Mbps and one with a rate of 0.448 Mbps: (2 x (120

min x 60 sec/min x 0.192 Mbps) + (120 min x 60 sec/min x 0.448 Mbps) = 5,990.4 Mbits.

• Two subtitles with a data rate of 0.010 Mbps: 2 x (120 min x 60 sec/min) x 0.010 Mbps = 144 Mbits.

• Two 24-second motion menus with an estimated data rate of 8 Mbps: 2 x (24 sec x 8 Mbps) = 384 Mbits.

• One-minute movie preview with a data rate of 4.5 Mbps: 60 sec x 4.5 Mbps =270 Mbits.

• 4% overhead: 0.04 x 68,320,000,000 bits = 2,732,800,000 bits = 2,732.8 Mbits.

• Total audio, subtitles, motion menus, preview, and overhead sizes: 5,990.4 Mbits + 144 Mbits + 384 Mbits + 270

Mbits + 2,732.8 Mbits = 9,521.2 Mbits.

• Disc space available for video: 68,320 Mbits - 9,521 Mbits = 58,799 Mbits.

3 Calculate the data rate of the video. Divide the disc space available for video that you determined in step 2 by the

amount of video (in seconds) the project contains: 58,799 Mbits / (120 minutes x 60 seconds/minute) = 8.16 Mbps.

4 Determine the maximum video data rate. Subtract the combined audio and subtitles data rates from the

maximum DVD video data rate of 9.8 Mbps: 9.8 Mbps - (0.192 + 0.192 + 0.448 + 0.010 + 0.010) = 8.95 Mbps.

So the video will fit on the disc using a data rate of 8.16 Mbps, which is below the maximum video data rate of 8.95.

Furthermore, since the target video data rate of 8.16 Mbps is above 6 Mbps, you do not need to use VBR.

Transcoding

About transcoding

Transcoding is the process by which Adobe Encore DVD converts your original, non-DVD-compliant video and

audio asset files to the DVD-compliant elements that will be burned to the disc. (Files that are already DVD-

compliant do not require transcoding.) The transcoding feature of Adobe Encore DVD is flexible enough for a

variety of users. New users unfamiliar with transcoding can let the application manage the process entirely, while

those with more experience can control it precisely. If you choose to manage transcoding yourself, Adobe Encore

DVD provides DVD-compliant transcode presets customized for several different quality and storage requirements.

You can also create your own custom transcode presets.

You can work with your original, untranscoded files throughout the production process—Adobe Encore DVD

performs any required transcoding when you build the DVD. If you want more control over transcoding, however,

you can choose to transcode at any time on a per-item basis. If a transcoded version of a file is available,

Adobe Encore DVD uses that version for authoring, previewing, and building; if no transcoded version is available,

the application uses the original file for authoring and previewing, and transcodes the files as necessary when

building the DVD.