@pigoz
Neat, thanks for your providing the build!
You also need to change the link paths in the individual libraries, I still see references to /opt/local when calling:
$ otool -L mplayer.app/Contents/MacOS/lib/* | grep /opt/local
I quickly adapted the script I use to change the install names:
http://mplayerosx.sttz.ch/downloads/...tall_names.zip
Running this on the libraries allows me to use your binary:
$ ./mposx_change_install_names mplayer.app/Contents/MacOS
You can find the full script in the Extended SVN under /Scripts/mposx_install which also gathers all necessary libraries automatically but which also contains some Extended-related functionality.