Unfortunately for your use case, FFMpeg is a traditional dynamically-linked (not dynamically-loading) program written in the C programming language, and that means that it becomes "dynamically linked" to all of its dependencies. This means that all of the dependencies that were present when that package of ffmpeg was compiled must also be installed before that ffmpeg is run, otherwise, errors will occur.

~ $ ldd $(command -v ffmpeg)
	libavdevice.so.61 => /data/data/com.termux/files/usr/lib/libavdevice.so.61
	libavfilter.so.10 => /data/data/com.termux/files/usr/lib/libavfilter.so.10
	libavformat.so.61 => /data/data/com.termux/files/usr/lib/libavformat.so.61
	libavcodec.so.61 => /data/data/com.termux/files/usr/lib/libavcodec.so.61
	libpostproc.so.58 => /data/data/com.termux/files/usr/lib/libpostproc.so.58
	libswresample.so.5 => /data/data/com.termux/files/usr/lib/libswresample.so.5
	libswscale.so.8 => /data/data/com.termux/files/usr/lib/libswscale.so.8
	libavutil.so.59 => /data/data/com.termux/files/usr/lib/libavutil.so.59
	libm.so => /system/lib64/libm.so
	libc.so => /system/lib64/libc.so
	librubberband.so => /data/data/com.termux/files/usr/lib/librubberband.so
	libharfbuzz.so => /data/data/com.termux/files/usr/lib/libharfbuzz.so
	libfribidi.so => /data/data/com.termux/files/usr/lib/libfribidi.so
	liblcms2.so => /data/data/com.termux/files/usr/lib/liblcms2.so
	libvmaf.so => /data/data/com.termux/files/usr/lib/libvmaf.so
	libass.so => /data/data/com.termux/files/usr/lib/libass.so
	libvidstab.so => /data/data/com.termux/files/usr/lib/libvidstab.so
	libzmq.so => /data/data/com.termux/files/usr/lib/libzmq.so
	libzimg.so => /data/data/com.termux/files/usr/lib/libzimg.so
	libOpenCL.so => /data/data/com.termux/files/usr/lib/libOpenCL.so
	libfontconfig.so => /data/data/com.termux/files/usr/lib/libfontconfig.so
	libfreetype.so => /data/data/com.termux/files/usr/lib/libfreetype.so
	libandroid.so => /data/data/com.termux/files/usr/lib/libandroid.so
	libdl.so => /system/lib64/libdl.so
	ld-android.so => /system/lib64/ld-android.so
	libxml2.so.16 => /data/data/com.termux/files/usr/lib/libxml2.so.16
	libbz2.so.1.0 => /data/data/com.termux/files/usr/lib/libbz2.so.1.0
	libgme.so => /data/data/com.termux/files/usr/lib/libgme.so
	libopenmpt.so => /data/data/com.termux/files/usr/lib/libopenmpt.so
	libbluray.so => /data/data/com.termux/files/usr/lib/libbluray.so
	libz.so.1 => /data/data/com.termux/files/usr/lib/libz.so.1
	libgnutls.so => /data/data/com.termux/files/usr/lib/libgnutls.so
	libsrt.so => /data/data/com.termux/files/usr/lib/libsrt.so
	libssh.so => /data/data/com.termux/files/usr/lib/libssh.so
	libiconv.so => /data/data/com.termux/files/usr/lib/libiconv.so
	libandroid-glob.so => /data/data/com.termux/files/usr/lib/libandroid-glob.so
	libvpx.so.11 => /data/data/com.termux/files/usr/lib/libvpx.so.11
	libwebpmux.so => /data/data/com.termux/files/usr/lib/libwebpmux.so
	libwebp.so => /data/data/com.termux/files/usr/lib/libwebp.so
	liblzma.so.5 => /data/data/com.termux/files/usr/lib/liblzma.so.5
	libdav1d.so => /data/data/com.termux/files/usr/lib/libdav1d.so
	libopencore-amrwb.so => /data/data/com.termux/files/usr/lib/libopencore-amrwb.so
	libaom.so => /data/data/com.termux/files/usr/lib/libaom.so
	libmp3lame.so => /data/data/com.termux/files/usr/lib/libmp3lame.so
	libopencore-amrnb.so => /data/data/com.termux/files/usr/lib/libopencore-amrnb.so
	libopus.so => /data/data/com.termux/files/usr/lib/libopus.so
	librav1e.so => /data/data/com.termux/files/usr/lib/librav1e.so
	libSvtAv1Enc.so => /data/data/com.termux/files/usr/lib/libSvtAv1Enc.so
	libtheoraenc.so => /data/data/com.termux/files/usr/lib/libtheoraenc.so
	libtheoradec.so => /data/data/com.termux/files/usr/lib/libtheoradec.so
	libvo-amrwbenc.so.0 => /data/data/com.termux/files/usr/lib/libvo-amrwbenc.so.0
	libvorbis.so => /data/data/com.termux/files/usr/lib/libvorbis.so
	libvorbisenc.so => /data/data/com.termux/files/usr/lib/libvorbisenc.so
	libx264.so.164 => /data/data/com.termux/files/usr/lib/libx264.so.164
	libx265.so => /data/data/com.termux/files/usr/lib/libx265.so
	libxvidcore.so.4 => /data/data/com.termux/files/usr/lib/libxvidcore.so.4
	libmediandk.so => /data/data/com.termux/files/usr/lib/libmediandk.so
	libsoxr.so => /data/data/com.termux/files/usr/lib/libsoxr.so
	libwebp.so.7 => /data/data/com.termux/files/usr/lib/libwebp.so.7
	libsharpyuv.so.0 => /data/data/com.termux/files/usr/lib/libsharpyuv.so.0
	libogg.so => /data/data/com.termux/files/usr/lib/libogg.so
	libandroid-posix-semaphore.so => /data/data/com.termux/files/usr/lib/libandroid-posix-semaphore.so
	libc++_shared.so => /data/data/com.termux/files/usr/lib/libc++_shared.so
	libmpg123.so => /data/data/com.termux/files/usr/lib/libmpg123.so
	libvorbisfile.so => /data/data/com.termux/files/usr/lib/libvorbisfile.so
	libudfread.so => /data/data/com.termux/files/usr/lib/libudfread.so
	libexpat.so.1 => /data/data/com.termux/files/usr/lib/libexpat.so.1
	libpng16.so => /data/data/com.termux/files/usr/lib/libpng16.so
	libbrotlidec.so => /data/data/com.termux/files/usr/lib/libbrotlidec.so
	libbrotlicommon.so => /data/data/com.termux/files/usr/lib/libbrotlicommon.so
	libidn2.so => /data/data/com.termux/files/usr/lib/libidn2.so
	libunistring.so => /data/data/com.termux/files/usr/lib/libunistring.so
	libhogweed.so.6 => /data/data/com.termux/files/usr/lib/libhogweed.so.6
	libnettle.so.8 => /data/data/com.termux/files/usr/lib/libnettle.so.8
	libgmp.so => /data/data/com.termux/files/usr/lib/libgmp.so
	libandroid-support.so => /data/data/com.termux/files/usr/lib/libandroid-support.so
	libcrypto.so.3 => /data/data/com.termux/files/usr/lib/libcrypto.so.3
	libsodium.so => /data/data/com.termux/files/usr/lib/libsodium.so
	libfftw3.so => /data/data/com.termux/files/usr/lib/libfftw3.so
	libsamplerate.so => /data/data/com.termux/files/usr/lib/libsamplerate.so
	libglib-2.0.so.0 => /data/data/com.termux/files/usr/lib/libglib-2.0.so.0
	libgraphite2.so => /data/data/com.termux/files/usr/lib/libgraphite2.so
	libpcre2-8.so => /data/data/com.termux/files/usr/lib/libpcre2-8.so

If any of those dependencies, or any dependencies of any of those dependencies, are uninstalled, then unfortunately, you will see that the current ffmpeg available in Termux will immediately stop working and have an error:

~ $ mv $PREFIX/lib/libbrotlidec.so ~
~ $ ffmpeg
CANNOT LINK EXECUTABLE "ffmpeg": library "libbrotlidec.so" not found: needed by /data/data/com.termux/files/usr/lib/libfreetype.so in namespace (default)
~ $ mv ~/libbrotlidec.so $PREFIX/lib/
~ $ ffmpeg
ffmpeg version 7.1.1 Copyright (c) 2000-2025 the FFmpeg developers
  built with Android (13624864, +pgo, +bolt, +lto, +mlgo, based on r530567e) clang version 19.0.1 (https://android.googlesource.com/toolchain/llvm-project 97a699bf4812a18fb657c2779f5296a4ab2694d2)
  configuration: --arch=aarch64 --as=aarch64-linux-android-clang --cc=aarch64-linux-android-clang --cxx=aarch64-linux-android-clang++ --nm=llvm-nm --ar=llvm-ar --ranlib=llvm-ranlib --pkg-config=/home/builder/.termux-build/_cache/android-r28c-api-24-v1/bin/pkg-config --strip=llvm-strip --cross-prefix=aarch64-linux-android- --disable-indevs --disable-outdevs --enable-indev=lavfi --disable-static --disable-symver --enable-cross-compile --enable-gnutls --enable-gpl --enable-version3 --enable-jni --enable-lcms2 --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libharfbuzz --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenmpt --enable-libopus --enable-librav1e --enable-librubberband --enable-libsoxr --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-mediacodec --enable-opencl --enable-shared --prefix=/data/data/com.termux/files/usr --target-os=android --extra-libs=-landroid-glob --disable-vulkan --enable-neon --disable-libfdk-aac
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Universal media converter
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'
~ $

The same exact limitation applies to ffmpeg on Desktop Linux, not only Android. Here are all the packages that would have to be removed from my Gentoo PC in order to remove libX11, which also include ffmpeg.

tacokoneko@CORSAIR ~/code/termux/termux-packages $ sudo emerge --depclean libX11 --verbose

Calculating dependencies... done!
  x11-libs/libX11-1.8.12 pulled in by:
    app-accessibility/at-spi2-core-2.54.1-r1 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    app-editors/pluma-1.28.0-r1 requires x11-libs/libX11
    app-editors/vscodium-1.101.24242 requires x11-libs/libX11
    app-emulation/wine-vanilla-10.0-r2 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    app-i18n/ibus-1.5.31-r1 requires x11-libs/libX11
    app-misc/fastfetch-2.45.0 requires x11-libs/libX11
    app-text/atril-1.28.1-r1 requires x11-libs/libX11
    app-text/texlive-core-2024-r1 requires x11-libs/libX11
    dev-dotnet/libgdiplus-6.0.2-r4 requires x11-libs/libX11
    dev-games/aseprite-1.3.5-r1 requires x11-libs/libX11
    dev-games/godot-4.4.1-r1 requires x11-libs/libX11
    dev-java/openjdk-17.0.15_p6-r1 requires x11-libs/libX11
    dev-java/openjdk-21.0.7_p6-r1 requires x11-libs/libX11
    dev-java/openjdk-25_p19-r1 requires x11-libs/libX11
    dev-java/openjdk-8.452_p09-r1 requires x11-libs/libX11
    dev-java/openjdk-bin-11.0.27_p6 requires x11-libs/libX11
    dev-java/openjdk-bin-21.0.7_p6 requires x11-libs/libX11
    dev-java/openjfx-11.0.11_p1-r4 requires x11-libs/libX11
    dev-java/swt-4.10-r4 requires x11-libs/libX11
    dev-lang/tk-8.6.16 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    dev-libs/m17n-lib-1.8.4-r2 requires x11-libs/libX11
    dev-perl/Tk-804.36.0-r5 requires x11-libs/libX11
    dev-qt/qtbase-6.9.1-r1 requires x11-libs/libX11
    dev-qt/qtgui-5.15.17 requires x11-libs/libX11
    dev-qt/qtmultimedia-6.9.1 requires x11-libs/libX11
    dev-qt/qtwebengine-6.9.1-r1 requires x11-libs/libX11
    dev-qt/qtwidgets-5.15.17 requires x11-libs/libX11
    dev-tcltk/blt-2.5.3-r3 requires x11-libs/libX11
    dev-tcltk/tix-8.4.3-r4 requires x11-libs/libX11
    dev-util/android-studio-2025.1.1.13 requires >=x11-libs/libX11-1.8.1
    dev-util/vulkan-tools-1.4.313.0 requires x11-libs/libX11[abi_x86_64(-)]
    games-util/antimicrox-3.5.1 requires x11-libs/libX11
    games-util/heroic-bin-2.17.2 requires x11-libs/libX11
    gnome-extra/yad-14.1 requires x11-libs/libX11
    gui-libs/gtk-4.18.6-r1 requires x11-libs/libX11
    kde-frameworks/kcrash-5.116.0 requires x11-libs/libX11
    kde-frameworks/kcrash-6.13.0 requires x11-libs/libX11
    kde-frameworks/kguiaddons-5.116.0-r2 requires x11-libs/libX11
    kde-frameworks/kguiaddons-6.13.0-r1 requires x11-libs/libX11
    kde-frameworks/kwindowsystem-5.116.0 requires x11-libs/libX11
    kde-frameworks/kwindowsystem-6.13.0 requires x11-libs/libX11
    mail-client/thunderbird-140.0.1 requires x11-libs/libX11
    mate-base/caja-1.28.0-r2 requires x11-libs/libX11
    mate-base/libmatekbd-1.28.0 requires x11-libs/libX11
    mate-base/mate-applets-1.28.1 requires x11-libs/libX11
    mate-base/mate-control-center-1.28.0-r2 requires x11-libs/libX11
    mate-base/mate-desktop-1.28.2 requires x11-libs/libX11
    mate-base/mate-panel-1.28.4-r1 requires x11-libs/libX11
    mate-base/mate-session-manager-1.28.0-r1 requires x11-libs/libX11
    mate-base/mate-settings-daemon-1.28.0-r2 requires x11-libs/libX11
    mate-extra/mate-power-manager-1.28.1-r1 requires x11-libs/libX11
    mate-extra/mate-screensaver-1.28.0 requires >=x11-libs/libX11-1
    mate-extra/mate-utils-1.28.0-r1 requires x11-libs/libX11
    media-gfx/blender-4.4.3 requires x11-libs/libX11
    media-gfx/eom-1.28.0-r3 requires x11-libs/libX11
    media-gfx/fbida-2.14-r6 requires x11-libs/libX11
    media-gfx/gimp-9999 requires x11-libs/libX11
    media-gfx/graphviz-12.2.1-r1 requires x11-libs/libX11
    media-gfx/inkscape-1.4-r2 requires x11-libs/libX11
    media-gfx/krita-5.2.9 requires x11-libs/libX11
    media-libs/freeglut-3.6.0-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    media-libs/glew-2.2.0-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    media-libs/gst-plugins-bad-1.24.11 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    media-libs/gst-plugins-base-1.24.11-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    media-libs/imlib2-1.12.3-r1 requires x11-libs/libX11[abi_x86_64(-)]
    media-libs/libcaca-0.99_beta19-r11 requires >=x11-libs/libX11-1.6.2
    media-libs/libcanberra-gtk3-0.30 requires x11-libs/libX11[abi_x86_64(-)]
    media-libs/libepoxy-1.5.10-r3 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    media-libs/libglvnd-1.7.0 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    media-libs/libpulse-17.0 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    media-libs/libsdl2-2.32.6 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    media-libs/libsfml-2.6.2 requires x11-libs/libX11
    media-libs/libva-2.22.0-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    media-libs/lsp-plugins-1.2.14 requires x11-libs/libX11
    media-libs/mesa-25.1.5 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    media-libs/netpbm-11.2.17 requires x11-libs/libX11
    media-libs/suil-0.10.22-r2 requires x11-libs/libX11
    media-libs/tg_owt-0_pre20250515-r2 requires x11-libs/libX11
    media-libs/vulkan-layers-1.4.313.0 requires x11-libs/libX11:=[abi_x86_32(-),abi_x86_64(-)], x11-libs/libX11:0/0=[abi_x86_32(-),abi_x86_64(-)]
    media-libs/vulkan-loader-1.4.313.0 requires x11-libs/libX11:=[abi_x86_32(-),abi_x86_64(-)], x11-libs/libX11:0/0=[abi_x86_32(-),abi_x86_64(-)]
    media-libs/zvbi-0.2.44 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    media-plugins/x42-avldrums-0.7.3 requires x11-libs/libX11
    media-video/ffmpeg-7.1.1-r2 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    media-video/ffmpeg-compat-6.1.2-r2 requires x11-libs/libX11[abi_x86_64(-)]
    media-video/libva-utils-2.22.0 requires >=x11-libs/libX11-1.6.2
    media-video/mpv-0.40.0-r3 requires x11-libs/libX11
    media-video/obs-studio-31.1.0 requires x11-libs/libX11
    media-video/pipewire-1.4.2 requires x11-libs/libX11
    media-video/vlc-3.0.21_p20250217-r3 requires x11-libs/libX11
    net-im/discord-0.0.101 requires x11-libs/libX11
    net-im/toxic-0.16.0 requires x11-libs/libX11
    net-irc/hexchat-2.16.2-r1 requires x11-libs/libX11
    net-libs/gtk-vnc-1.3.1-r1 requires >=x11-libs/libX11-1.6.5
    net-libs/webkit-gtk-2.46.5-r411 requires x11-libs/libX11
    net-libs/webkit-gtk-2.46.5-r601 requires x11-libs/libX11
    net-misc/moonlight-6.1.0-r2 requires x11-libs/libX11
    net-misc/spice-gtk-0.42-r4 requires x11-libs/libX11
    net-misc/teamviewer-15.64.3 requires x11-libs/libX11
    net-misc/tigervnc-1.15.0-r1 requires x11-libs/libX11
    net-voip/mumble-1.5.735 requires x11-libs/libX11
    sci-visualization/gnuplot-6.0.2-r2 requires x11-libs/libX11
    sys-apps/dbus-1.16.2 requires x11-libs/libX11
    sys-apps/groff-1.23.0 requires x11-libs/libX11
    www-client/firefox-140.0.4 requires x11-libs/libX11
    www-client/surf-2.1-r3 requires x11-libs/libX11
    www-client/ungoogled-chromium-137.0.7151.103_p1 requires x11-libs/libX11:0/0=
    x11-apps/appres-1.0.7 requires x11-libs/libX11
    x11-apps/fonttosfnt-1.2.4 requires x11-libs/libX11
    x11-apps/mesa-progs-9.0.0 requires x11-libs/libX11[abi_x86_64(-)]
    x11-apps/transset-1.0.4 requires x11-libs/libX11
    x11-apps/xauth-1.1.4 requires x11-libs/libX11
    x11-apps/xdpyinfo-1.3.4 requires x11-libs/libX11
    x11-apps/xgamma-1.0.7 requires x11-libs/libX11
    x11-apps/xhost-1.0.10 requires x11-libs/libX11
    x11-apps/xinit-1.4.4 requires x11-libs/libX11
    x11-apps/xinput-1.6.4 requires >=x11-libs/libX11-1.3
    x11-apps/xkbcomp-1.4.7 requires >=x11-libs/libX11-1.6.9
    x11-apps/xkill-1.0.6 requires x11-libs/libX11
    x11-apps/xmodmap-1.0.11 requires x11-libs/libX11
    x11-apps/xprop-1.2.8 requires x11-libs/libX11
    x11-apps/xrandr-1.5.3 requires x11-libs/libX11
    x11-apps/xrdb-1.2.2 requires x11-libs/libX11
    x11-apps/xset-1.2.5 requires x11-libs/libX11
    x11-apps/xsetroot-1.1.3 requires x11-libs/libX11
    x11-apps/xwininfo-1.1.6 requires x11-libs/libX11
    x11-libs/cairo-1.18.4-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/gdk-pixbuf-xlib-2.40.2 requires x11-libs/libX11[abi_x86_64(-)]
    x11-libs/gtk+-2.24.33-r3 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/gtk+-3.24.49-r1 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXScrnSaver-1.2.4 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    x11-libs/libXaw-1.0.16 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    x11-libs/libXcomposite-0.4.6 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXcursor-1.2.3 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXdamage-1.1.6 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXext-1.3.6 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXfixes-6.0.1 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXft-2.3.9 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXi-1.8.2 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXinerama-1.1.5 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXmu-1.2.1 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    x11-libs/libXpm-3.5.17 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    x11-libs/libXpresent-1.0.1 requires x11-libs/libX11[abi_x86_64(-)]
    x11-libs/libXrandr-1.5.4 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXrender-0.9.12 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXres-1.2.2 requires x11-libs/libX11
    x11-libs/libXt-1.3.1-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    x11-libs/libXtst-1.2.5 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXv-1.0.13 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libXxf86vm-1.1.6 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libvdpau-1.5 requires x11-libs/libX11[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/libwnck-43.2 requires x11-libs/libX11
    x11-libs/libxkbfile-1.1.3 requires x11-libs/libX11[abi_x86_64(-)]
    x11-libs/libxklavier-5.4-r1 requires x11-libs/libX11:0/0=, x11-libs/libX11:=
    x11-libs/motif-2.3.8-r6 requires >=x11-libs/libX11-1.6.2[abi_x86_64(-)]
    x11-libs/pango-1.56.4-r1 requires >=x11-libs/libX11-1.6.2[abi_x86_32(-),abi_x86_64(-)]
    x11-libs/startup-notification-0.12-r2 requires >=x11-libs/libX11-1.4.3
    x11-libs/wxGTK-3.2.8.1 requires x11-libs/libX11[abi_x86_64(-)]
    x11-misc/dmenu-5.3 requires x11-libs/libX11
    x11-misc/mate-notification-daemon-1.28.1-r2 requires x11-libs/libX11
    x11-misc/obconf-2.0.4_p20150213-r2 requires x11-libs/libX11
    x11-misc/picom-12.5 requires x11-libs/libX11
    x11-misc/screengrab-2.9.0 requires x11-libs/libX11
    x11-misc/xdotool-3.20211022.1-r1 requires x11-libs/libX11
    x11-misc/xscreensaver-6.09-r1 requires x11-libs/libX11
    x11-terms/kitty-0.41.1-r1 requires x11-libs/libX11
    x11-terms/mate-terminal-1.28.1 requires x11-libs/libX11
    x11-terms/st-0.9.2 requires x11-libs/libX11
    x11-terms/xterm-398 requires x11-libs/libX11
    x11-wm/marco-1.28.1-r2 requires x11-libs/libX11

>>> No packages selected for removal by depclean

If you've read this far, though, you might be interested to know that there are theoretical workarounds/solutions to your problem that might not be too difficult to set up.

One possible solution is: an ffmpeg-minimal package can be compiled and provided that intentionally has all nonessential ffmpeg features and dependencies disabled at compile-time, which creates copies ("builds") of ffmpeg that can work and be used in Termux or other Linux distributions without having to have nearly as many dependencies installed.

FFMpeg provides package maintainers a convenient build setting, --disable-everything, which can be used to achieve that result.

Do you think that is something that would help you in your goal of setting up a yt-dlp configuration in Termux with as few dependencies as possible?

Additionally, if I help you create an invidual build of ffmpeg with --disable-everything applied for yourself, that you could maintain and recompile on your own, do you think that would be able to meet your needs sufficiently, or would you prefer that an ffmpeg-minimal package become available in Termux for you to more easily get using pkg install ffmpeg-minimal on any device that you have just clean installed Termux on, which would need to be maintained and recompiled regularly by Termux package maintainers?

Uh oh!

Optional ffmpeg deps #26222

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Optional `ffmpeg` deps #26222