@Marek This one could be CLOSED. Your commit SOLVED it. My reported 'mpv' bug is compilation related. mpv: ../src/gallium/state_trackers/vdpau/vdpau_private.h:138: FormatYCBCRToPipe: Assertion `0' failed. openSUSE Tumbleweed's Mesa 19.1.5 fine (release ?!). Mesa git with LLVM 10.0.0, gcc 9.1.1 meson ../ --strip --buildtype release ... is fine, too. But meson ../ --strip --buildtype debugoptimized ... is brocken, now. Worked for ages, before.