Videomass is a cross-platform GUI designed for FFmpeg enthusiasts who need to manage custom profiles to automate conversion/transcoding processes.
It is based on an advanced use of presets and profiles in order to use most of the FFmpeg commands without limits of formats and codecs.
It features graphical tools for viewing, analyzing and processing multimedia streams and downloading videos via youtube-dl.

NOTE: This is only to provide appimages, I am not the developer.