It would need to pull media-plugins/gst-plugins-mplex as reported in bug 372007 Reproducible: Always
And also media-plugins/gst-plugins-mpeg2dec
gst-plugins-mpeg2dec is okay, but gst-plugins-mplex needs a lot of keywords before gst-plugins-meta can depend on it. Either that, or it needs it's own USE flag that is masked on all the arches that cannot keyword it.
I would try to add both behind "vcd" USE flag as I am not sure how much people from that arches without mplex keyworded will want to have full vcd support, then, I think "vcd" could be masked on them.
+*gst-plugins-meta-0.10-r6 (30 Jun 2011) + + 30 Jun 2011; Pacho Ramos <pacho@gentoo.org> +gst-plugins-meta-0.10-r6.ebuild, + metadata.xml: + Revision bump for installing needed plugins to handle VCDs and SVCDs properly + (bug #372157) and for HTML5 support (bug #364759 by Priit Laes). +