[icecast] reencoding at different bit rates

[Duke]

I'm trying to setup a couple streams, each at a different bit rate.  I was 
going for 128 and 64 kbit streams, but for some reason, when I tried 64, the 
stream wasn't reencoded at that bit rate - it was just left to whatever bit 
rate the mp3 was.  So I tried a few others, and found that 112, 96, and 56 
all worked.
Is there any reason for this?  Is it possibly a bug?
I'm using icecast 1.3.12, and ices 0.2.3.

Thanks.

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