Headless mode for GL plugin

[Matthew Waters]

Accessing the GPU without a windowing system is something that is very
specific to every driver/hardware combination.  We support (with 1.14)
one method using kms and a libgbm compatible driver which are used by
all of the Mesa drivers.  Some other embedded systems (rpi, imx6) have
other ways. That nvidia blog post you've linked contains references to
EGL_EXT_device_query
<https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_device_query.txt>
which I guess is nvidia's way of performing a similar thing and such a
method could be added to the GStreamer GL library and plugins.

Cheers
-Matt

On 23/03/18 21:10, Alexander Yanin wrote:
> Hi!
>
> Is it possible to use GL elements (like glvideomixer, glupload,
> gleffects, etc) without anything like Wayland, Xorg, etc? In
> particular, I want to use glvideomixer instead of compositor on a
> server without any display attached. I heard about a possible
> workaround using frame buffer, but I didn't manage to find a way to
> use glvideomixer without xorg or wayland. It crushes on context
> initialization.
>
> Here is the output:
>
> glmixer gstglbasemixer.c:217:_get_gl_context:<mixer> error: Failed to
> initialize egl: EGL_NOT_INITIALIZED
> glwindow gstglwindow.c:285:gst_gl_window_new: Could not create window.
> user specified (null), creating dummy window
> glcontext
> gstglcontext.c:1235:gst_gl_context_create_thread:<glcontextegl48>
> Failed to create context
>
> So, is there a way to bypass this issue without using xorg or wayland?
> I heard that it is possible to initialize EGL without xorg [1]. Is it
> possible to use this approach within gl elements?
>
> [1]
> - https://devblogs.nvidia.com/egl-eye-opengl-visualization-without-x-server/
>
>
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> gstreamer-devel at lists.freedesktop.org
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