Comment 9 for bug 585496

Huh? The _average_ bitrate is about the same...

But that's the whole point of variable bitrate encoding...

VBR conserves bits when they are not needed (silent pieces, etc), and uses them whenever the encoding gets hardest...

Constant bitrate does not produce constant quality
Variable bitrate can approach constant quality

http://en.wikipedia.org/wiki/Variable_bitrate#Average_bitrate