[Libva] regression from 1.2: ivybridge + i965/libva=1.3 decodes solid black with mpv --hwdec=vaapi --vo=opengl

[Kevin Mitchell]

With the lastest mpv/ffmpeg[1] from git master,

$ mpv --no-config --hwdec=vaapi --vo=opengl <h264file>
shows a solid black screen when linking to vaapi/intel-driver 1.3 and
greater (including git master of both). There are no problems however with
vaapi/intel-driver 1.2.2.

On the other hand,
$ mpv --no-config --hwdec=vaapi --vo=vaapi <h264file>
works fine with 1.3, so it seems to be some issue with opengl interop.

This poroblem is only exhibited on an Ivy Bridge machine. A comparably
configured Sandy Bridge machine decodes as expected with the first command
in all cases.

Any Ideas?

Kevin

[1] http://mpv.io/
Debian Bug #743701
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%23743701
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