User Guide

ENCODING AUDIO AND VIDEO 4-5
7 In the Encode Setup window, select New Audio Set from the Audio
Settings list.
VBR vs. CBR
V
BR (Variable Bit-rate) encoding and CBR
(Constant Bit-rate) encoding are two options for
encoding video. Bit rate is the speed at which the
v
ideo, audio, and interactivity stream off the disc.
T
he maximum rate is 9.8 Megabits per second.
CBR encoding allots the same number of bits per
scene through the entire encode. With this
process, you can fit about an hour of video on a
4.7 GB disc.
To get more video in the same amount of space,
VBR encoding is used. The VBR encoding process
allots only as many bits per scene as is needed.
The amount needed is based on an analysis pass
of the source video where the encoder
determines what content is difficult to compress
and what is easy. The result is a lower average
bit-rate, but the same high quality. With VBR, you
can get about 2 hours of video on the same
4.7 GB disc.