Combined Audio and Video bitrate question

When combining audio and video, how does the bitrate of the audio affect the calculation of the total bitrate? If I set my video compression bitrate at 5.5/7.5, how should those numbers be altered if I have, say, two Dolby Digital 2.0 streams at 192kbs each and a 5.1 surround stream at 448kbs?

From the DVD Studio Pro User Manual (p. 43):
Beware of Setting Your Bit Rate Too High
You will find that with some DVD projects, the content easily fits on the disc, and you may be tempted to use the highest video bit rate available. While higher bit rates produce better quality, you must take into account other factors before deciding to use the maximum allowable value.
The maximum video bit rate allowed on SD-based DVDs is 9.8 Mbps, but rarely is that practical to use since DVD players support combined video, audio, and subtitle bit rates of up to 10.08 Mbps. For HD-based DVDs, the maximum video bit rate is 29.4 Mbps for HD assets and 15.0 Mbps for any SD assets used in an HD project, with an overall maximum bit rate of 30.24 Mbps.
In practice, you should be conservative when determining how high of a bit rate to allow for. Trying to squeeze out the highest possible bit rate for your project can lead to player compatibility and disc space issues. A general recommendation is to not exceed 9.2 Mbps for the combined video and audio bit rates when authoring SD projects, or 29 Mbps when authoring HD projects.
Important: If you are building your project and DVD Studio Pro detects that the bit rate of the multiplexed stream is too high, the build stops and an error message appears.
Using PCM or AC-3 Audio
A single PCM audio stream using typical settings (as produced with the embedded AIFF encoder) requires 1.536 Mbps, which leaves an absolute maximum bit rate for the video in an SD project of around 8.54 Mbps. If there are two PCM audio streams, 3.07 Mbps must be allowed for the audio, leaving just 7.01 Mbps for the video.
Note: Even though you can only play one audio stream at a time, the bit rates of all audio streams must be added together when determining the overall bit rate for a track. Similarly, all subtitle streams must be added together and added to the overall bit rate.
Using AC-3 audio in place of the PCM audio leaves far more room for the video bit rate. Stereo AC-3 audio using typical settings requires only about 224 kbps—using two stereo AC-3 streams in place of the PCM audio leaves about 9.6 Mbps for the video.
See “Calculate the audio allowances” on page 636 for more information about allowances for other audio formats.
Hope this helps
Good luck!

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