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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libde265-1.0.16::gentoo  USE="-debug -dec265 -enc265 -sdl -tools" CPU_FLAGS_X86="sse4_1" 817 KiB

Total: 1 package (1 new), Size of downloads: 817 KiB