XunoPlayer-MPV is fork of MPV multimedia playback library based on MPlayer/mplayer2 and FFmpeg with a Qt GUI and enhanced user functionality optimized for High Quality 12-bit RGB AV1 & HEVC video.
XunoPlayer has been added to FFmpeg projects page http://ffmpeg.org/projects.html
MPV is free software licensed under the terms of GPLv2 "or later" by default, LGPLv2.1 "or later" with --enable-lgpl. If you use MPV or its constituent libraries, you must adhere to the terms of the license in question.