When installing xnoise-9999 it won't start: $ xnoise ** ERROR:Player/xnoise-gst-player.c:1476:xnoise_gst_player_create_elements: assertion failed: (asink != null) [1] 32159 abort xnoise When looking into the most recent totem-ebuild, it also contains those dependencies: >=media-libs/gst-plugins-bad-1.0.2:1.0 media-libs/gst-plugins-good:1.0 media-plugins/gst-plugins-taglib:1.0 media-plugins/gst-plugins-meta:1.0 (I left out taglib, as xnoise seems to use an own solution - but I'm not entirely sure about that, yet) And indeed xnoise starts and works (though there are some problems with certain mkv files - different issue ;))
I don't have any of those installed and xnoise works fine. xnoise already depends on gst-plugins-base which should provide a sink (alsa). Anyway, I've added gst-plugins-meta now. I don't think this will guarantee a sink plugin, but with sane global USE flags, it should pull in something usable.