Don't worry, my english is bad too

The problem is, that only compiled mplayer from slack.it is able to play
sound from videos that are recorded by phone (*.3gp files).
I try to compile mplayer using configure options --prefix=/usr/lib
and --with-codecsdi=/usr/lib/codecs (this is path where the megapack install codecs
and other libraries) but I still dont heave sound! If you know what I have to do please help.
Maybe you (I mean all slacky community) should compile mplayer on english and put it on the repository
(I know that this is too much to ask, but this is my favorite repo and I all my packages have downloaded from it,
btw, nice work people

)