Question abt VBR

"howard chen" <[email protected]> Tue, 20 Mar 2007 00:19:24 +0800

Newsgroups	gmane.comp.audio.mp3.encoders
Message-ID	<[email protected]>

I have a stereo 16 bit wav file sampled at 48000Hz

I use two methods to encode

1. CBR, 128Kbps
2. VBR, 128Kbps, Joint Stereo


When comparing the file size, I have 2 questions

1. Why the file size of VBR is bigger than CBR?

2. Why VBR produce more samples in the output (viewing the properties
using foobar)

3. Will Joint Stereo affect the size?

Thanks...