Wayland VAAPI without monitor

[Víctor Jáquez]

On Wed, 01 Jul 2020 at 12:48, Frederic Turmel wrote:
> Hi, our application is leveraging VAAPI x264 encode and also has the
> requirement that a monitor may or may not be connected to the GPU output.
> 
> When no display is connected with wayland the VAAPI plugging fail during
> init with this error and fail to initialized vaapih264enc:
> 
> *:00:00.003987000 26531 0x564aa0e27b20 ERROR           vaapidisplay
> gstvaapidisplay_wayland.c:150:gst_vaapi_display_wayland_setup: failed to
> determine the display size0:00:00.004037000 26531 0x564aa0e27b20 ERROR
>            default gstvaapi.c:239:plugin_init: Cannot create a VA display*
> 
> We do not see this problem when using X output.
> 
> Example to repro when running in SSH remote session:
> XDG_RUNTIME_DIR=/tmp/.Xweston/\:0 gst-launch-1.0 videotestsrc
> num-buffers=1000 ! vaapih264enc ! fakesink --gst-debug=vaapidisplay:5

That's odd. If you enable libdrm & libudev at compilation time, DRM backend is
enabled and it is chosen in run-time if no display is found. How do you compile
gstreamer-vaapi?

> 
> XDG_RUNTIME_DIR=/tmp/.Xweston/\:0 gst-inspect-1.0 vaapi
> gst-instpect vaapi will report 0 features. which is expected since the init
> of vaapi fails
> 
> We are using Weston on ubuntu 18  This could be a bug in the vaapi init
> plugin or we are missing something in our system/weston config?
> 
> Thanks
> FredT

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