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

Calculating dependencies ... done!
Dependency resolution took 1.30 s (backtrack: 0/20).

[ebuild  N     ] media-libs/libdvdcss-1.4.3:1.2::gentoo  USE="-doc" 380 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/libunibreak-8.0:0/8::gentoo  USE="-doc -man -static-libs -test" 1063 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-libs/libxdg-basedir-1.2.3-r1::gentoo  USE="-doc" 31 KiB
[ebuild  N     ] media-libs/a52dec-0.7.4-r9::gentoo  USE="-oss" 236 KiB
[ebuild  N     ] media-libs/faad2-2.11.2::gentoo  642 KiB
[ebuild  N     ] media-libs/libdca-0.0.7-r1::gentoo  USE="-debug -oss" 155 KiB
[ebuild  N     ] media-libs/dav1d-1.5.4:0/7::gentoo  USE="8bit 10bit asm -test -xxhash" 1015 KiB
[ebuild  N     ] media-libs/x264-0.0.20240513-r1:0/164::gentoo  USE="interlaced -opencl -static-libs" 822 KiB
[ebuild  N     ] media-libs/x265-4.3:0/217::gentoo  USE="10bit 12bit cet -numa -test -vmaf" 2005 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     ] media-libs/aalib-1.4_rc5-r11::gentoo  USE="X gpm -slang" 382 KiB
[ebuild  N     ] media-libs/libass-0.17.5-r1:0/9::gentoo  USE="fontconfig libunibreak -test -verify-sig" 450 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/libdvdread-7.1.1:0/8::gentoo  USE="css -static-libs" 101 KiB
[ebuild  N     ] media-libs/libdvdnav-7.0.0::gentoo  USE="-static-libs" 84 KiB
[ebuild  N     ] media-video/ffmpeg-compat-6.1.6:6/58.60.60::gentoo  USE="X alsa bzip2 dav1d drm fontconfig gmp gnutls gpl jpeg2k libass opengl openssl postproc ssh truetype x264 x265 xml xvid zlib -amf -amr -amrenc (-appkit) -bluray -bs2b -cdio -chromaprint -codec2 -cuda-clang -fdk -flite -frei0r -fribidi -gcrypt -gme -gsm -iec61883 -ieee1394 -jack -jpegxl -kvazaar -ladspa -lame -lcms -libaom -libaribb24 -libcaca -libilbc -libplacebo -librtmp -libsoxr -lv2 -lzma -modplug -nvenc -ocr -openal -opencl -openh264 -openmpt -opus -pulseaudio -qsv -rabbitmq -rav1e -rubberband -samba -sdl -shaderc -snappy -sndio -soc -sofa -speex -srt -svg -svt-av1 -theora -twolame -v4l -vaapi -vdpau -verify-sig -vidstab -vorbis -vpx -vulkan -webp -zeromq -zimg -zvbi" 10262 KiB
[ebuild  N     ] media-libs/xine-lib-1.2.13-r3:1::gentoo  USE="X a52 aac aalib alsa css dts jpeg mmap nls opengl truetype xv -bluray -dav1d -dvb -dxr3 -fbcon -flac -gtk -imagemagick -jack -libcaca -mad -mng -modplug -musepack -nfs -oss -pulseaudio -samba -sdl -sftp -speex -theora -v4l -vaapi -vcd -vdpau -vdr (-vidix) (-vis) -vorbis -vpx -wavpack -wayland -xinerama -xvmc" 4891 KiB

Total: 21 packages (21 new), Size of downloads: 25409 KiB