User Guide

54 Chapter 4, Preparing Assets
To calculate the bit budget:
1 Calculate the combined average bit rate for video and audio (see “Media Capacities” on
page 55 for DVD disc sizes):
Disc size: __________ Mbits ÷ Total length of presentation: _________ seconds
Average bit rate = __________ Mbps
Note: If you are creating a hybrid DVD, you must reduce the Disc size by the size of the
ROM content.
2 Calculate the average video bit rate by subtracting the audio requirements (see Table 3
on page 44 for the bit-rate requirements for different types of audio):
Average bit rate: ________ Mbps – Audio bit rate: ________ Mbps
Average video bit rate = __________ Mbps
3 Calculate the maximum video bit rate (for variable bit-rate (VBR) encodes only):
9.8 MBps – Audio bit rate: ________ Mbps
Maximum video bit rate = __________ Mbps
See “Sample Bit Budget Calculation” on page 57 for an example of this calculation.