[Bug 220444] x11-servers/xorg-server crashes on attempt to play a video using VDPAU

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220444

--- Comment #9 from Mikhail Teterin <mi at FreeBSD.org> ---
(In reply to Jan Beich from comment #8)
> Maybe see https://en.wikipedia.org/wiki/Direct_Rendering_Infrastructure#DRI3
Thanks! Looks like I am not missing anything -- the DRI3 may make coding things
up easier for developers, but whatever already works, works just as well.

My own test with mplayer using different video-output settings (-vo foo) with
the same video-file is:

vdpau:   108.792u 3.347s 9:30.43 19.6%   3934+697k 3+35io 2056pf+0w
xv:      107.773u 3.170s 9:29.83 19.4%   3936+697k 3+35io 2056pf+0w
gl_nosw: 107.862u 3.402s 9:29.85 19.5%   3935+697k 3+35io 2056pf+0w
x11:     108.078u 3.252s 9:29.82 19.5%   3943+699k 3+35io 2056pf+0w
sdl:     107.477u 3.406s 9:29.80 19.4%   3950+700k 3+35io 2056pf+0w

Thank you for your help, Jan. Maybe, DRI should be limited to 2 automatically,
unless whatever functionality is necessary in kernel is detected at run-time?

> https://bugzilla.mozilla.org/show_bug.cgi?id=1210729
Neither the age of the bug, nor the treatment of the impatient comments there
(labeling them as spam?) are encouraging :(

> layers.acceleration.force-enabled=true may provide better compositing
No obvious difference, unfortunately...

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