O'Reilly logo

Apple Pro Training Series Compressor Quick-Reference Guide by Brian Gary

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

5. Encoding for DVD

Compressor can encode for two types of digital video discs: standard-definition (SD DVD) and high-definition discs (HD DVD).

t0055_01.jpg

Understanding Disc Capacity

Why does only 4.3 GB of data fit on a 4.7 GB DVD?

The discrepancy arises because DVD manufacturers use decimals to calculate 1 GB as 1 billion bytes (1000 x 1000 x 1000). Computer data storage on DVD, in contrast, is measured using a binary byte system (in which 1 KB is actually 1024 decimal bytes). There is a difference of roughly 7 percent when the two measurement methods are compared. Therefore, a 4.7 GB data disk will only hold 4.37 GB of data.

The same applies to dual-layer ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required