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

Calculating dependencies ... done!
Dependency resolution took 1.58 s (backtrack: 0/20).


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by kde-apps/kdenlive-26.08.2::gentoo
# required by =kde-apps/kdenlive-26.08.2 (argument)
>=media-video/ffmpeg-8.1.3 sdl
# required by kde-apps/kdenlive-26.08.2::gentoo
# required by =kde-apps/kdenlive-26.08.2 (argument)
>=media-libs/mlt-7.40.0 qt6 ffmpeg sdl xml frei0r
# required by x11-misc/xdg-utils-1.2.1-r11::gentoo
# required by kde-frameworks/kf-env-6::gentoo
# required by kde-frameworks/kcolorscheme-6.31.0::gentoo
# required by kde-frameworks/qqc2-desktop-style-6.31.0::gentoo
# required by kde-apps/kdenlive-26.08.2::gentoo
# required by =kde-apps/kdenlive-26.08.2 (argument)
>=app-text/xmlto-0.0.28-r11 text
# required by kde-frameworks/qqc2-desktop-style-6.31.0::gentoo
# required by kde-apps/kdenlive-26.08.2::gentoo
# required by =kde-apps/kdenlive-26.08.2 (argument)
>=kde-frameworks/sonnet-6.31.0 qml
# required by media-plugins/frei0r-plugins-2.4.1-r1::gentoo[facedetect]
# required by media-libs/mlt-7.40.0::gentoo[frei0r]
# required by kde-apps/kdenlive-26.08.2::gentoo
# required by =kde-apps/kdenlive-26.08.2 (argument)
>=media-libs/opencv-4.14.0 contribdnn contrib features2d

!!! The ebuild selected to satisfy ">=media-libs/opencv-2.3.0:=[contrib,contribdnn,features2d,ffmpeg,abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_s390_32(-)?,abi_s390_64(-)?]" has unmet requirements.
- media-libs/opencv-4.14.0::gentoo USE="eigen ffmpeg gif jpeg jpeg2k opengl openmp png python tiff truetype -atlas -avif -contrib -contribcvv -contribdnn -contribfreetype -contribhdf (-contribovis) -contribsfm -contribxfeatures2d -cuda -cudnn -debug -doc -examples -features2d -gdal -gflags -glog -gphoto2 -gstreamer -gtk3 -ieee1394 -jasper -java -lapack -mkl -non-free -opencl -opencvapps -openexr -openni -openni2 -qt6 -quirc -spng -tbb -tesseract -test -testprograms -v4l -vaapi -vtk -vulkan -wayland -webp -wechat-qrcode -xine" CPU_FLAGS_X86="avx avx2 avx512bw avx512cd avx512dq avx512f avx512vl f16c fma3 popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3 -avx512_4fmaps -avx512_4vnniw -avx512_bitalg -avx512_vbmi2 -avx512_vnni -avx512_vpopcntdq -avx512er -avx512ifma -avx512pf -avx512vbmi" PYTHON_TARGETS="python3_14 -python3_12 -python3_13" VIDEO_CARDS="-intel"

  The following REQUIRED_USE flag constraints are unsatisfied:
    opengl? ( any-of ( gtk3 qt6 wayland ) )

  The above constraints are a subset of the following complete expression:
    amd64? ( cpu_flags_x86_sse cpu_flags_x86_sse2 cpu_flags_x86_avx2? ( cpu_flags_x86_f16c ) cpu_flags_x86_f16c? ( cpu_flags_x86_avx ) cpu_flags_x86_avx512er? ( cpu_flags_x86_avx512pf ) cpu_flags_x86_avx512pf? ( cpu_flags_x86_avx512er ) cpu_flags_x86_avx512_4fmaps? ( cpu_flags_x86_avx512_4fmaps ) cpu_flags_x86_avx512_4vnniw? ( cpu_flags_x86_avx512_4vnniw ) ) atlas? ( lapack ) cuda? ( contrib ) cudnn? ( cuda ) gflags? ( contrib ) glog? ( contrib ) contribcvv? ( contrib qt6 ) contribfreetype? ( contrib ) contribhdf? ( contrib ) contribovis? ( contrib ) contribsfm? ( contrib eigen gflags glog ) contribxfeatures2d? ( contrib ) jasper? ( !abi_x86_32 ) java? ( python ) mkl? ( lapack ) opengl? ( any-of ( gtk3 qt6 wayland ) ) python? ( any-of ( python_targets_python3_12 python_targets_python3_13 python_targets_python3_14 ) ) tesseract? ( contrib ) testprograms? ( test ) test? ( any-of ( ffmpeg gstreamer ) jpeg png tiff features2d ) wayland? ( !vtk ) wechat-qrcode? ( contribdnn )

(dependency required by "media-plugins/frei0r-plugins-2.4.1-r1::gentoo" [ebuild])
(dependency required by "media-libs/mlt-7.40.0::gentoo[frei0r]" [ebuild])
(dependency required by "kde-apps/kdenlive-26.08.2::gentoo" [ebuild])
(dependency required by "=kde-apps/kdenlive-26.08.2" [argument])