При сборке свежего mpv:
=8<===================================================================
Checking for FFmpeg/Libav present                                    : yes 
Checking for libav* is FFmpeg                                        : no 
Checking for libav* is Libav                                         : yes 
Checking for Libav/FFmpeg library versions                           : no ('libavutil >= 55.20.0 libavcodec >= 57.25.0 libavformat >= 57.7.0 libswscale >= 4.0.0 libavfilter >= 6.7.0 libavresample >= 3.0.0' not found) 
Unable to find development files for some of the required FFmpeg/Libav libraries. You need at least FFmpeg 3.2.2 or Libav 12. Aborting.
=8<===================================================================

Поскольку ffmpeg до сизифа так и не добрался на данный момент, обновление mpv блокируется.