1-Pass Encoding: (RECOMMENDED)
1-pass encoding is the quickest way to encode your video in the DivX format, at the expense of some quality - it allows you to set a fixed average bit-rate to use for the entire encoding.
Step 3. Selecting the Audio Bitrate:
1)Make sure that you select “Ulead Mpeg-1 Layer2” for your Audio Encode Codec and then click “OK” to finish and save your settings.