liba52 isn't compiled even if a52 USE flag was set. ffac3 is used instead but it doesn't downmix Dolby to 4 channels.
Created attachment 229707 [details] Honor a52 USE flag
Thanks. + 29 Apr 2010; Samuli Suominen <ssuominen@gentoo.org> + mplayer-1.0_rc4_p20100427.ebuild, mplayer-9999.ebuild: + Fix liba52 handling wrt #317797 by Simone Scanzoni. Next time post diff's instead full ebuilds... please