If this is for an SD DVD, you need to render your video as an mpeg-2 file and your audio as either a WAV or AC-3 file. Give both the same name and render them to the same folder. That way when you load the video file into DVDA the audio file will automatically follow. The bitrate used will depend on the length of your video. If it’s less than 70 min. I use a custom CBR of 8,000,000. Anything longer and I use a bitrate calculator to determine optimum 2-pass settings.