I think it has to do with a patch to pass through AC3 on some sound
cards or something but I haven't found a solution.
I'm going to keep experimenting and hopefully figure out something that
works.
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I've been getting this error too.
I only get it with 0.9.5. If I switch back to 0.9.4 it
goes away.
I am using snd-intel8x0
I don't know if this will help, but here is my strace
from aplay...
execve("/usr/bin/aplay", ["aplay", "Pink Floyd - The
Wall - Disk 1 (Entire Album).mp3"], [/* 42 vars */])