!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

virtual/ffmpeg:0

  (virtual/ffmpeg-9::gentoo, installed) pulled in by
    >=virtual/ffmpeg-9[threads?,vdpau?] required by (media-video/mplayer2-2.0_p20130428-r1::gentoo, ebuild scheduled for merge)

  (virtual/ffmpeg-9::gentoo, ebuild scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)


It might be possible to solve this slot collision
by applying all of the following changes:
   - virtual/ffmpeg-9 (Change USE: +threads +vdpau)


 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (sys-power/upower-0.99.0-r1::gentoo, ebuild scheduled for merge) pulled in by
    >=sys-power/upower-0.9.23 required by (xfce-base/xfce4-session-4.10.1-r2::gentoo, ebuild scheduled for merge)

  (sys-power/upower-pm-utils-0.9.23-r2::gentoo, ebuild scheduled for merge) pulled in by
    sys-power/upower-pm-utils required by (net-im/telepathy-mission-control-5.14.1::gentoo, ebuild scheduled for merge)
    sys-power/upower-pm-utils required by (gnome-base/gnome-control-center-3.10.3::gentoo, ebuild scheduled for merge)
    sys-power/upower-pm-utils required by (gnome-base/gnome-settings-daemon-3.10.2::gentoo, ebuild scheduled for merge)
    sys-power/upower-pm-utils required by (gnome-base/gnome-session-3.10.1::gentoo, ebuild scheduled for merge)

  (sys-apps/systemd-212-r5::gentoo, ebuild scheduled for merge) pulled in by
    sys-apps/systemd required by (net-p2p/transmission-2.82-r3::gentoo, ebuild scheduled for merge)
    sys-apps/systemd required by (sys-auth/polkit-0.112-r1::gentoo, ebuild scheduled for merge)
    sys-apps/systemd:0= required by (gnome-base/gvfs-1.18.3-r1::gentoo, ebuild scheduled for merge)
    sys-apps/systemd required by (sys-fs/udisks-2.1.3::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-44-r1[pam] required by (sys-auth/pambase-20120417-r3::gentoo, ebuild scheduled for merge)
    sys-apps/systemd required by (gnome-base/gnome-settings-daemon-3.10.2::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-183:0= required by (gnome-base/gnome-session-3.10.1::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-186:0= required by (sys-apps/accountsservice-0.6.37::gentoo, ebuild scheduled for merge)
    sys-apps/systemd:0= required by (sys-apps/dbus-1.8.6::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-183:0= required by (net-misc/networkmanager-0.9.8.8::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-207 required by (sys-apps/gentoo-systemd-integration-4::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-31 required by (gnome-base/gnome-control-center-3.10.3::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-183 required by (net-misc/networkmanager-0.9.8.8::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-44:0= required by (x11-misc/colord-1.0.3::gentoo, ebuild scheduled for merge)
    >=sys-apps/systemd-208:0 required by (virtual/udev-208-r2::gentoo, ebuild scheduled for merge)
    sys-apps/systemd:0=[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?] (sys-apps/systemd:0=[abi_x86_64(-)]) required by (media-sound/pulseaudio-5.0-r2::gentoo, ebuild scheduled for merge)

  (sys-fs/udev-212-r1::gentoo, ebuild scheduled for merge) pulled in by
    >=sys-fs/udev-208-r1:0/0[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?,static-libs?] (>=sys-fs/udev-208-r1:0/0[abi_x86_64(-),static-libs]) required by (virtual/libudev-208::gentoo, ebuild scheduled for merge)
    >=sys-fs/udev-208-r1:0/0[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?,gudev,introspection?,static-libs?] (>=sys-fs/udev-208-r1:0/0[abi_x86_64(-),gudev,introspection,static-libs]) required by (virtual/libgudev-208::gentoo, ebuild scheduled for merge)


For more information about Blocked Packages, please refer to the following
section of the Gentoo Linux x86 Handbook (architecture is irrelevant):

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?full=1#blocked