When I add an MP3 file to a menu background, it makes the file huge. Same thing with WAV. Is there any way to make this not happen? (If it is AC3 I need to use, what software do you reccomend?)
You can convert to ac3 using vegas or let dvda do the conversion.
When you add audio to the menu, make sure to specify the menu duration.
dvda will create a video and audio file for the menu duration, so by adding audio, you also add video at a default 8Mbps! If your menu is static, reduce the menu bit rate in the optimize.
MP3 isn't supported by DVD spec so perhaps DVD-A will be encoding it as PCM (.wav) audio. WAV is about 1600kbs so it will take up a huge chunk of your available space on the disc.
As suggested encode as AC3 audio & don't have menu bitrate for video unnecessarily high.