Heads up forum, for some reason this was happening to me so I had to build the librist-git PKGBUILD from the AUR and replace it.

Here is the lddtree: 
    libffmpegthumbnailer.so.4 => /usr/lib/libffmpegthumbnailer.so.4
        libavformat.so.60 => /usr/lib/libavformat.so.60
            libxml2.so.2 => /usr/lib/libxml2.so.2
                libicuuc.so.72 => /usr/lib/libicuuc.so.72
                    libicudata.so.72 => /usr/lib/libicudata.so.72
            libmodplug.so.1 => /usr/lib/libmodplug.so.1
            libopenmpt.so.0 => /usr/lib/libopenmpt.so.0
                libmpg123.so.0 => /usr/lib/libmpg123.so.0
                libvorbis.so.0 => /usr/lib/libvorbis.so.0
                    libogg.so.0 => /usr/lib/libogg.so.0
                libvorbisfile.so.3 => /usr/lib/libvorbisfile.so.3
            libbluray.so.2 => /usr/lib/libbluray.so.2
            libgmp.so.10 => /usr/lib/libgmp.so.10
            libgnutls.so.30 => /usr/lib/libgnutls.so.30
                libp11-kit.so.0 => /usr/lib/libp11-kit.so.0
                    libdl.so.2 => /usr/lib/libdl.so.2
                    libpthread.so.0 => /usr/lib/libpthread.so.0
                libbrotlienc.so.1 => /usr/lib/libbrotlienc.so.1
                libidn2.so.0 => /usr/lib/libidn2.so.0
                libunistring.so.5 => /usr/lib/libunistring.so.5
                libtasn1.so.6 => /usr/lib/libtasn1.so.6
                libnettle.so.8 => /usr/lib/libnettle.so.8
                libhogweed.so.6 => /usr/lib/libhogweed.so.6
            librist.so.4 => /usr/lib/librist.so.4
                libmbedcrypto.so.7 => None
Yes, I'm using ffmpeg-obs could that be why I have libmbedcrypto.so.14 instead of ....7
i'm confused, what binary is the above lddtree for? my spacefm has no librist or libmbedcrypto linked.. and the only thing libmbedcrypto (from mbedutls) is for is obs..
yours seems to be linked to these via ffmpegthumbnailer (which seems a bit strange) ... i'd probly start with rebuilding this or ffmpeg-obs..
with AUR, when in doubt rebuild everything..

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