Videomass is a free, open source and cross-platform GUI for FFmpeg and youtube-dl
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.
Videomass is a project created by Gianluca Pernigotto (jeanslack) and it was written in Python3 with the wxPython4 “Phoenix”, then it is cross-platform and work on Linux, Mac-Os, MS-Windows and FreeBSD.
FFmpeg is a separate project, not connected to Videomass. “FFmpeg is a complete, cross-platform solution to record, convert and stream audio and video. It includes libavcodec - the leading audio/video codec library.” FFmpeg is a Trademark of Fabrice Bellard, originator of the FFmpeg project. FFmpeg is free software and is licensed under the LGPL or GPL. Specifically in the case of versions of FFmpeg packaged with Videomass on the installers for Windows and MacOS, FFmpeg is licensed under the GPL. Complete FFmpeg documentation and sources are available at FFmpeg.org
youtube_dl is a command-line program to download videos from YouTube.com and a few more sites. It requires the Python interpreter, version 2.6, 2.7, or 3.2+, and it is not platform specific. It should work on your Unix box, on Windows or on macOS. It is released to the public domain, which means you can modify it, redistribute it or use it however you like.