media-libs/faad2-2.0-r9 depends on media-libs/libmp4v2, but the latter specifically blocks media-libs/faad2-2.0-r9. This makes it impossible to update media-libs/faad2 to version 2.0-r9.
My useflags are as follows:
USE="gtk gnome qt kde cups doc silc ieee1394 dvd dvdread alsa arts timidity audiofile cdr userlocales unicode cjk mmx xvid xvmc real mp3 flac vorbis win32codecs asf aac a52 aalib network dvdr x86 directfb fbcon pcmcia aim msn ethereal spell crypt oss mozilla svga video_cards_i810 pic -curl hub -ipv6"
Unmerge the old version first.
*** This bug has been marked as a duplicate of 79606 ***
*** Bug 118735 has been marked as a duplicate of this bug. ***