mplayer

$ equery list mplayer
 * Searching for mplayer ...
[IP-] [  ] media-video/mplayer-1.1-r1:0

$ equery -q uses '=media-video/mplayer-1.1-r1' | tr "\\n" " "
-3dnow -3dnowext +X +a52 -aalib +alsa -bidi -bindist -bl -bluray -bs2b -cddb +cdio -cdparanoia -cpudetection -debug -dga -directfb -doc +dts +dv -dvb +dvd +dvdnav -dxr3 +enca +encode -faac +faad -fbcon -ftp -ggi +gif -gsm +iconv +ipv6 -jack -joystick +jpeg -jpeg2k -ladspa +libass -libcaca -libmpeg2 -lirc +live -lzo +mad -md5sum +mmx -mmxext +mng +mp3 -nas +network -nut -openal +opengl +osdmenu -oss +png -pnm -pulseaudio -pvr +quicktime -radio +rar +real +rtc -rtmp -samba +sdl +shm +speex +sse +sse2 -ssse3 -tga +theora +toolame +tremor +truetype +twolame +unicode -v4l -vdpau -video_cards_mga -video_cards_s3virge -video_cards_tdfx +vorbis +x264 -xanim -xinerama +xscreensaver +xv +xvid -xvmc -zoran