mpv is based on mplayer2, which in turn is based on the original MPlayer (also called mplayer, mplayer-svn, mplayer1). Many changes have been made. Some changes are incompatible, or completely change how the player behaves.
Notable changes from MPlayer 2 include removal of lots of unneeded code to encourage developer activity (less obscure scary zombie code that kills any desire for hacking the codebase), removal of dust and dead bodies (code-wise) such as kernel drivers for decades old hardware, removal of support for dead platforms, better OSD rendering (using libass), support for playing URLs of popular streaming sites directly.
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These details are provided for information only. No information here is legal advice and should not be used as such.
There are no reported vulnerabilities