Headless VA-API hardware accelerated H.264 video encoding with vaapih264enc?

[Andressio]

Hi and sorry if I continue this thread but I have a very similar issue except
I'm trying to decode using vaapi instead of encoding.

I have a pc with ubuntu 18.04 where I've installed gstreamer 1.14.1 from
repository. This pc is connected to an IP camera from which I receive a h264
stream via rtsp. I'm using the following pipeline for testing:

/gst-launch-1.0 rtspsrc
location="rtsp://root:root@192.168.0.91:554/axis-media/media.amp?videocodec=h264&resolution=3840x2160&compression=0&clock=0&date=0&fps=25&videokeyframeinterval=10&videobitrate=0&camera=1"
protocols=GST_RTSP_LOWER_TRANS_TCP latency=0 ! rtph264depay ! queue !
vaapih264dec ! videoconvert ! video/x-raw, format=BGR ! fakesink dump=true/

and everything works fine, I can see the dumped data (if I attach a display
sink I can see the stream). If I run the command /gst-inspect-1.0 vaapi/ I
can see 16 features and vaapih264dec is included.

As long as I am logged on this pc for testing everything's good. But this pc
must work remotely and an application using a similar pipeline should run
without the need to be logged in. So without logging in I've connected to
the pc via ssh but the same pipeline  returns me the error
/WARNING: erroneous pipeline: no element "vaapih264dec"/
and the command /gst-inspect-1.0 vaapi/ shows 0 features.
I've tried to put /DISPLAY= WAYLAND_DISPLAY=/ in front of the pipeline but
still, same result.

I then proceeded to build gstreamer (1.15.2) from source building
gstreamer-vaapi only with drm (--enable-drm=yes --enable-x11=no
--enable-glx=no --enable-wayland=no --enable-egl=no)  and for what I can see
it compiled and installed correctly. Compiled also the intel driver i965.

Via ssh I've exported the following environment variable to be sure not to
conflict with old gstreamer from repo:
PATH, LD_LIBRARY_PATH, LIBVA_DRIVERS_PATH, LIBVA_DRIVER_NAME

but still i get /no element "vaapih264dec"/ and gst-instpect shows 0
features.
Do you have any suggestions?
Many thanks



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