I just filed[1] bug #5166 in bugzilla about this: Looks like the newly-built mp4tools didn't pick up the correct version of the also-newly-built wxsvg, as it contains an incompatible symbol definition. With both installed: mp4tools-3.7-3.fc29.x86_64 wxsvg-1.5.16-1.fc29.x86_64 $ mp4joiner mp4joiner: symbol lookup error: mp4joiner: undefined symbol: _ZN20wxFfmpegMediaDecoder11SetPositionEdb $ nm -D /lib64/libwxsvg.so.3|grep -i FfMpegMediaDecoder11SetPosition 000000000011fa30 T _ZN20wxFfmpegMediaDecoder11SetPositionEdbb Note how the symbol ends with "Edb" (mp4tools) vs. "Edbb" (wxsvg). $ sudo dnf downgrade wxsvg Downgraded: dvdstyler-1:3.0.4-5.fc29.x86_64 wxsvg-1.5.12-7.fc29.x86_64 $ mp4joiner [dumps core, complaining about...] (mp4joiner:1172): Gtk-ERROR **: 16:18:56.917: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported zsh: trace trap (core dumped) mp4joiner $ sudo dnf downgrade mp4tools Downgraded: mp4tools-3.6.1-2.fc29.x86_64 $ mp4joiner [...works] [1] : https://bugzilla.rpmfusion.org/show_bug.cgi?id=5166