If I run mpv:

$ mpv
ffmpeg library versions:
libavutil 55.34.100 (runtime 55.34.101)
libavcodec 57.64.101
libavformat 57.56.100 (runtime 57.56.101)
libswscale 4.2.100
libavfilter 6.65.100
libswresample 2.3.100
ffmpeg version: 3.2.3

mpv was compiled against a different version of FFmpeg/Libav than the shared
library it is linked against. This is most likely a broken build and could
result in misbehavior and crashes.

mpv does not support this configuration and will not run - rebuild mpv instead.

Exiting... (Fatal error)