I have installation of microsoft teams client which interacts with ffmpeg and I think this causing issue. Reproducible: Always Steps to Reproduce: 1. emerge ffmpeg 2. 3. Actual Results: Calculating dependencies... done! [ebuild U ] media-video/ffmpeg-4.2.4-r2:0/56.58.58::gentoo [4.2.4-r1:0/56.58.58::gentoo] USE="X alsa bzip2 chromium encode gpl iconv mp3 network postproc pulseaudio samba sdl threads vaapi vdpau vorbis vpx x264 x265 zlib -amr -amrenc (-appkit) -bluray -bs2b -cdio -chromaprint -codec2 -cpudetection (-cuda) -dav1d -debug -doc -fdk -flite -fontconfig -frei0r -fribidi -gcrypt -gme -gmp -gnutls -gsm -hardcoded-tables -iec61883 -ieee1394 -jack -jpeg2k -kvazaar -ladspa -libaom -libaribb24 -libass -libcaca -libdrm -libilbc -librtmp -libsoxr -libtesseract -libv4l -libxml2 -lv2 -lzma (-mipsdspr1) (-mipsdspr2) (-mipsfpu) (-mmal) -modplug -nvenc -openal -opencl -opengl -openh264 -openssl -opus -oss -pic -rubberband -snappy -speex -srt -ssh -static-libs -svg -test -theora -truetype -twolame -v4l -vidstab -wavpack -webp -xvid -zeromq -zimg -zvbi" ABI_X86="(64) -32 (-x32)" CPU_FLAGS_X86="aes avx avx2 fma3 mmx mmxext sse sse2 sse3 sse4_1 sse4_2 ssse3 -3dnow -3dnowext -fma4 -xop" FFTOOLS="aviocat cws2fws ffescape ffeval ffhash fourcc2pixfmt graph2dot ismindex pktdumper qt-faststart sidxindex trasher" 0 KiB Total: 1 package (1 upgrade), Size of downloads: 0 KiB WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict: media-video/ffmpeg:0 (media-video/ffmpeg-4.4.2:0/56.58.58::gentoo, ebuild scheduled for merge) USE="X alsa bzip2 chromium dav1d encode gnutls gpl iconv mp3 network postproc pulseaudio samba sdl threads vaapi vdpau vorbis vpx x264 x265 zlib (-amf) -amr -amrenc (-appkit) -bluray -bs2b -cdio -chromaprint -codec2 -cpudetection (-cuda) -debug -doc -fdk -flite -fontconfig -frei0r -fribidi -gcrypt -gme -gmp -gsm -hardcoded-tables -iec61883 -ieee1394 -jack -jpeg2k -kvazaar -ladspa -libaom -libaribb24 -libass -libcaca -libdrm -libilbc -librtmp -libsoxr -libtesseract -libv4l -libxml2 -lv2 -lzma (-mipsdspr1) (-mipsdspr2) (-mipsfpu) (-mmal) -modplug -nvenc -openal -opencl -opengl -openh264 -openssl -opus -oss -pic -rav1e -rubberband -snappy -sndio -speex -srt -ssh -static-libs -svg -svt-av1 -test -theora -truetype -twolame -v4l -verify-sig -vidstab (-vmaf) -vulkan -webp -xvid -zeromq -zimg -zvbi" ABI_X86="(64) -32 (-x32)" CPU_FLAGS_X86="aes avx avx2 fma3 mmx mmxext sse sse2 sse3 sse4_1 sse4_2 ssse3 -3dnow -3dnowext -fma4 -xop" FFTOOLS="aviocat cws2fws ffescape ffeval ffhash fourcc2pixfmt graph2dot ismindex pktdumper qt-faststart sidxindex trasher" conflicts with <media-video/ffmpeg-4.3[chromium] required by (net-im/teams-1.4.00.26453-r1:0/0::gentoo, installed) USE="swiftshader system-ffmpeg" ABI_X86="(64)" L10N="am ar bg bn ca cs da de el en-GB es es-419 et fa fi fil fr gu he hi hr hu id it ja kn ko lt lv ml mr ms nb nl pl pt-BR pt-PT ro ru sk sl sr sv sw ta te th tr uk vi zh-CN zh-TW" ^ ^^^
This is unfixable until teams updates their ffmpeg, or you can set USE=-system-ffmpeg on teams.