https://bugs.freedesktop.org/show_bug.cgi?id=111414
--- Comment #9 from Michel Dänzer michel@daenzer.net --- (In reply to Dieter Nützel from comment #7)
mpv: ../src/gallium/state_trackers/vdpau/vdpau_private.h:138: FormatYCBCRToPipe: Assertion `0' failed.
[...]
meson ../ --strip --buildtype release ... is fine, too.
Assertions are disabled by default for release builds. The assertion failure is still a bug, though a separate one from that reported here.