After updating 'mplayer', 'mpv', and 'ffplay4' to pkgsrc-2020Q3, I have not seen any crashes nor "black window" playing test files without needing "LIBGL_ALWAYS_SOFTWARE=1".
'ffplay4' is rather choppy in its playback, 'mpv --vo=gpu' works although it may de-sync on some files. "xv" and "sdl" video output works. Again, this is on NetBSD/amd64-9.0_STABLE. -- |/"\ John D. Baker, KN5UKS NetBSD Darwin/MacOS X |\ / jdbaker[snail]consolidated[flyspeck]net OpenBSD FreeBSD | X No HTML/proprietary data in email. BSD just sits there and works! |/ \ GPGkeyID: D703 4A7E 479F 63F8 D3F4 BD99 9572 8F23 E4AD 1645