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

Calculating dependencies ... done!
Dependency resolution took 1.01 s (backtrack: 0/20).

[ebuild  N     ] media-video/aravis-0.8.34-r1::gentoo  USE="-doc -fast-heartbeat -gstreamer -introspection -packet-socket -test -usb -viewer" 845 KiB

Total: 1 package (1 new), Size of downloads: 845 KiB