Check the apple.com forums, too.
This is an all-too-common issue with DVDSP2 and 3. Bit budgeting should be automated, or at least user-configurable, but it’s not. It’s a stupid and manual process and requires the user to make esoteric choices none of us understand till we’ve screwed them up dozens of times. This has nothing to do with file size. It’s all about playing back the file and you are limited not to a computer performance but to the DVD Spec written 20 years ago.
The problem is that audio and video combined are your total bandwidth and you have no control over audio. You must set your video bit rate not to exceed about 6.5. That leaves you about 2.5 for your audio bandwidth. You must use the APack encoder (itself a marvel of stupid non-Macintosh interface design) to process your audio separately from the video. Then bring the new audio track into your DVDSP project and replace the original audio with the new track. APack creates a full fidelity compressed file that is remarkably compact and requires only about 1/10th the bandwdith of conventional MPEG2 audio.
DVDSP4 rocks, upgrade if you plan to try to make money with DVDs.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”