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

Calculating dependencies ... done!
Dependency resolution took 0.96 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libde265-1.1.3::gentoo  USE="-debug -dec265 -sdl -tools" CPU_FLAGS_X86="avx2 avx512f sse" 317 KiB

Total: 1 package (1 new), Size of downloads: 317 KiB