Basically, most people use default mp3 128/96 kbps constant bitrate for Divx movie files.It is good in quality but of big size.
What i mean is, suppose your video is only some speech in the file then you need higher kbps enough to hear.when it is music or say some fast sequence in film then you need better quality andperfect sound.In CBR (Constant Bit Rate), it is constant at all the moments of file. In VBR (Variable Bit Rate), the algoritham decides what to do and what should be the quality for specific sequence.It lowers somewhat which is not needed in higher music which doen't affect you and it highers the audio when it needs to be hear perfect sound in speech.
What i mean is, suppose your video is only some speech in the file then you need higher kbps enough to hear.when it is music or say some fast sequence in film then you need better quality andperfect sound.In CBR (Constant Bit Rate), it is constant at all the moments of file. In VBR (Variable Bit Rate), the algoritham decides what to do and what should be the quality for specific sequence.It lowers somewhat which is not needed in higher music which doen't affect you and it highers the audio when it needs to be hear perfect sound in speech.
And if you don't want to use mp3 then you can use ogg as yur audio format.It is free as well as good quality and less size.
Tools needed for video/audio conversion
1.VirtualDub/FlaskMpeg
2.lamecodec(mp3)/ogg codec
3.oggmux(To mix mute video and ogg file to make .ogm)
All these can be found on http://www.doom9.org
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