Now I've gone trough your whole guide and everything went smooth. FINALLY I can play cell phone video files again with sound! And it seems like this version of mplayer is able to play almost every file out there. I write almost since it actually crashed on an old .rm file. Though, VLC was able to play that one fine. So I guess the combination of this mplayer and VLC 1.0.2 is a winner in total. The only thing I miss in smplayer is the A-B loop playback, like in VLC. I still think that I can write success at this point! Thanks to andrew.46!
I hope that you'll stick around in here for a long time!