mplayer error: undefined symbol: faacDecOpen

[Adam Funk <a24061@yahoo.com>]

I've been using Christian Marillat's mplayer packages for quite a
while, mostly successfully.  But recently it started failing with this error:

$ mplayer 
mplayer: symbol lookup error: /usr/lib/libavcodec.so.51: undefined symbol: faacDecOpen

regardless of the arguments after mplayer.

I've looked at the Google results and they all point to the same
thing:

--> 5/11/2004 :
--> If you see this error message with mplayer :
--> 
--> mplayer: relocation error:
--> /usr/lib/libavcodec.so.0.4.9-pre1: undefined symbol:
--> faacDecOpen
--> 
--> Install my libfaad2-0 package, and don't try to mix up video
--> packages from my site with others repositories (for example
--> the rarewares.org repository) this doesn't work.

but that was a long time ago, and I'm fairly certain I am using his
libfaad2-0 package:

$ dpkg -l mplayer* libfaad*
[snipped out the uninstalled stuff]
ii  libfaad2-0                              2.0.0+cvs20060416-0.1  
ii  mplayer                                 1.0-pre7cvs20060325-0.3
ii  mplayer-doc                             1.0-pre7cvs20060325-0.3
ii  mplayer-skin-blue                       1.5-0.5                

I'd appreciate any suggestions for solving or debugging this problem.

Thanks,
Adam