MPV 0.26 has hit FreeBSD ports, just upgraded. A few observations:
dvdnav seems to be working much better.
Replaygain functionality has been restored (using the --replaygain-* set of options).
And... I get errors when using the OSS audio output driver under FreeBSD. "[ao/oss] Audio device returned broken buffer state" spammed continuously. The message can be suppressed with "--msg-level=ao/oss=fatal". I wonder what that's about...