mpv is a fork of mplayer2 and MPlayer. It shares some features with the former projects while introducing many more.
MPlayer's options parser was improved to behave more like other CLI programs, and many option names and semantics were reworked to make them more intuitive and memorable.
While mpv has no official GUI, it has a small controller that is triggered by mouse movement.
mpv has a OpenGL based video output that is capable of many features loved by videophiles, such as video scaling with popular high quality algorithms, color management, frame timing, interpolation, and more.
mpv leverages the FFmpeg hwaccel APIs to support VDPAU, VAAPI, DXVA2, VDA and VideoToolbox video decode acceleration.
A straightforward C API was designed from the ground up to make mpv usable as a library and facilitate easy integration into other applications.