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