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You can get the "All" codecs package here.

From the included README:

Code:

Put the files contained in this archive in a directory where MPlayer will find

them. The default directory is /usr/local/lib/codecs/ ($prefix/lib/codecs/) if

you are compiling from source, but you can change that value by passing the

'--with-codecsdir' option to './configure'.



If you use a prebuilt MPlayer package it will most likely be /usr/lib/codecs,

see the documentation of your package for details.



In the past /usr/local/lib/win32 or /usr/lib/win32 was the default directory,

some packages as well as a few other Unix players like xine and avifile still

use it, refer to their documentation for further details.