[Bug 782212] elements get blacklisted when DISPLAY variable is not set

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782212

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
The problem is gst_vaapi_display_create_unlocked (): it tries to extract the
display size when the instantiated display is X11, but if the system is
headless, there is no display to query.

We have to options here:

1\ Follow the proposed patch and use only the DRM, though some drivers might no
support DRM
2\ Refactor the code and avoid the display query when creating the display.

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