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

Calculating dependencies ... done!
Dependency resolution took 1.79 s (backtrack: 0/20).

[ebuild   R    ] app-misc/mime-types-2.1.54::gentoo  USE="nginx*" 29 KiB
[ebuild  N     ] dev-libs/libunibreak-8.0:0/8::gentoo  USE="-doc -man -static-libs -test" 1063 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     ] media-libs/x264-0.0.20240513-r1:0/164::gentoo  USE="interlaced -opencl -static-libs" 822 KiB
[ebuild  N     ] media-libs/xvid-1.3.7-r2::gentoo  USE="-examples" 683 KiB
[ebuild  N     ] x11-libs/libXv-1.0.13::gentoo  USE="-doc" 275 KiB
[ebuild  N     ] acct-group/nginx-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-user/nginx-0-r2::gentoo  USE="-icingaweb2 -mgraph" 0 KiB
[ebuild  N     ] net-libs/libssh-0.12.2:0/4::gentoo  USE="sftp zlib -debug -examples -fido2 -gssapi -mbedtls -pcap -server -static-libs -test -verify-sig" 742 KiB
[ebuild  N     ] media-libs/x265-4.3:0/217::gentoo  USE="10bit 12bit cet -numa -test -vmaf" 2005 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     ] media-libs/dav1d-1.5.4:0/7::gentoo  USE="8bit 10bit asm -test -xxhash" 1015 KiB
[ebuild  N     ] media-libs/libass-0.17.5-r1:0/9::gentoo  USE="fontconfig libunibreak -test -verify-sig" 450 KiB
[ebuild  N     ] media-video/ffmpeg-8.1.3:0/60.62.62::gentoo  USE="X alsa bzip2 cairo dav1d drm fontconfig gmp gnutls gpl jpeg2k libass opengl openssl ssh truetype x264 x265 xml xvid zlib -amf -amr -amrenc (-appkit) -bluray -bs2b -cdio -chromaprint -chromium -codec2 -cuda-clang -doc -dvd -fdk -flite -frei0r -fribidi -gcrypt -gme -gsm -iec61883 -ieee1394 -jack -jpegxl -kvazaar -ladspa -lame -lcms -libaom -libaribb24 -libcaca -libilbc -liblc3 -libplacebo -librtmp -libsoxr -lv2 -lzma -modplug -nvenc -ocr -openal -opencl -opencolorio -openh264 -openmpt -opus -pulseaudio -qrcode -qsv -quirc -rabbitmq -rav1e -rist -rubberband -samba -sdl -snappy -sndio -soc -sofa -speex -srt -svg -svt-av1 -theora -twolame -v4l -vaapi -vdpau -verify-sig -vidstab -vmaf -vorbis -vpx -vulkan -webp -zeromq -zimg -zvbi" 11458 KiB
[ebuild  N     ] www-servers/nginx-1.31.7:0/1.31.7::gentoo  USE="aio http modules -debug -libatomic -mail (-selinux) -stream -test" NGINX_MODULES_HTTP="access auth_basic autoindex browser charset empty_gif fastcgi geo grpc gzip limit_conn limit_req map memcached mirror proxy referer rewrite scgi split_clients ssi ssl upstream_hash upstream_ip_hash upstream_keepalive upstream_least_conn upstream_random upstream_zone userid uwsgi v2 -addition -auth_request -dav -degradation -flv -geoip -gunzip -gzip_static -image_filter -mp4 -perl -random_index -realip -secure_link -slice -stub_status -sub -v3 -xslt" NGINX_MODULES_MAIL="imap pop3 smtp ssl" NGINX_MODULES_STREAM="access geo limit_conn map pass return set split_clients ssl upstream_hash upstream_least_conn upstream_random upstream_zone -geoip -realip -ssl_preread" 1360 KiB
[ebuild  N     ] www-nginx/ngx-vod-1.33::gentoo  461 KiB

Total: 17 packages (16 new, 1 reinstall), Size of downloads: 21556 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by www-servers/nginx-1.31.7::gentoo
# required by www-nginx/ngx-vod-1.33::gentoo
# required by =www-nginx/ngx-vod-1.33 (argument)
>=app-misc/mime-types-2.1.54 nginx