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

Calculating dependencies ... done!
Dependency resolution took 1.25 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libogg-1.3.6::gentoo  USE="-static-libs" 430 KiB
[ebuild  N     ] media-libs/alsa-topology-conf-1.2.5.1-r1::gentoo  USE="-verify-sig" 12 KiB
[ebuild  N     ] media-libs/alsa-ucm-conf-1.2.16.1::gentoo  USE="-verify-sig" 83 KiB
[ebuild  N     ] dev-libs/libsigc++-2.12.1:2::gentoo  USE="-gtk-doc -test" 4924 KiB
[ebuild  N     ] dev-cpp/mm-common-1.0.8::gentoo  277 KiB
[ebuild  N     ] app-text/iso-codes-4.20.1::gentoo  16024 KiB
[ebuild  N     ] media-libs/alsa-lib-1.2.16.1::gentoo  USE="python -debug -doc -verify-sig" PYTHON_SINGLE_TARGET="python3_14 -python3_12 -python3_13 (-python3_15)" 1104 KiB
[ebuild  N     ] dev-lang/orc-0.4.42::gentoo  USE="-static-libs -test" 275 KiB
[ebuild  N     ] media-libs/gstreamer-1.26.11:1.0::gentoo  USE="caps nls -introspection -ptp -test -unwind -verify-sig" 1857 KiB
[ebuild  N     ] dev-cpp/glibmm-2.66.8-r1:2::gentoo  USE="-debug -gtk-doc -test" 8396 KiB
[ebuild  N     ] media-libs/libvorbis-1.3.7-r2::gentoo  USE="-static-libs -test" 1176 KiB
[ebuild  N     ] x11-libs/libXv-1.0.13::gentoo  USE="-doc" 275 KiB
[ebuild  N     ] media-libs/graphene-1.10.8-r1::gentoo  USE="-doc -introspection -test" CPU_FLAGS_X86="sse2" 175 KiB
[ebuild  N     ] media-libs/gst-plugins-base-1.26.11:1.0::gentoo  USE="X alsa egl gles2 nls ogg opengl orc pango vorbis -gbm -introspection -ivorbis -test -theora -verify-sig -wayland" 2452 KiB
[ebuild  N     ] dev-cpp/gstreamermm-1.10.0-r3:1.0/1::gentoo  USE="-doc -examples -test" 3447 KiB

Total: 15 packages (15 new), Size of downloads: 40902 KiB