ffmpegx is the internal package name for the ffmpeg-tools add-on.
The installed binary is /storage/.kodi/addons/tools.ffmpeg-tools/bin/ffmpeg and the path should be set.
- Which LE version on which platform (hardware) do you use?
- What does "when I go in terminal" mean?
- There is already add-on 9.2.0.111 listed in my Generic installation.