Something

emerge -puv mplayer

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] media-libs/x264-svn-20070325 [20061014-r1] USE="-debug -threads" 481 kB
[ebuild     U ] media-libs/libdv-1.0.0-r2 [1.0.0-r1] USE="-debug -sdl* -xv* (-gtk%*)" 0 kB
[ebuild     U ] media-libs/libmpcdec-1.2.6 [1.2.4] USE="(-doc%)" 105 kB
[ebuild     U ] net-fs/samba-3.0.24-r3 [3.0.24] USE="acl cups kerberos ldap oav pam python quotas readline winbind -async -automount -caps% -doc -examples -fam (-selinux) -swat -syslog" LINGUAS="-ja* -pl*" 0 kB
[ebuild     U ] media-sound/esound-0.2.38 [0.2.37-r1] USE="alsa ipv6 tcpd -debug" 385 kB
[ebuild     U ] media-video/realplayer-10.0.8-r2 [10.0.8-r1] USE="X nsplugin" 6,495 kB
[ebuild     U ] media-libs/libtheora-1.0_alpha7-r1 [1.0_alpha7] USE="-doc -encode* -examples" 1,635 kB
[ebuild     U ] media-plugins/live-2007.02.20 [2007.01.17] 0 kB
[ebuild  N    ] media-video/mplayer-1.0.20070622-r1  USE="X a52 aac aalib alsa bidi cpudetection dga dts dv dvb dvd esd iconv ipv6 jack joystick libcaca live lzo mmx mp3 musepack openal quicktime rar real samba speex theora unicode v4l v4l2 win32codecs x264 xinerama xvid xvmc -3dnow -3dnowext (-altivec) -amrnb -amrwb -arts -bindist -bl -cddb -cdparanoia -custom-cflags -debug -directfb -doc -dvdnav -enca -encode -fbcon -ftp -ggi -gif -gtk -ivtv -jpeg -lirc -livecd -mad -md5sum -mmxext -mp2 -nas -opengl -oss -png -pnm -radio -rtc -sdl -srt -sse -sse2 -ssse3 -svga -tga -tivo -truetype -vidix -vorbis -xanim -xv -zoran" VIDEO_CARDS="mga s3virge tdfx vesa" 0 kB

Total: 9 packages (8 upgrades, 1 new), Size of downloads: 9,099 kB