[Bug 794306] New: vaapih264enc caps negotiation is broken by default

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794306

            Bug ID: 794306
           Summary: vaapih264enc caps negotiation is broken by default
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: olivier.crete at ocrete.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

It also fails if one puts h264parse or rtph264pay afterwards without forcing a
profile.

$ gst-launch-1.0 -v videotestsrc !  vaapih264enc  ! video/x-h264 ! fakesink
failed to open /usr/lib64/dri/hybrid_drv_video.so
Failed to wrapper hybrid_drv_video.so
failed to open /usr/lib64/dri/hybrid_drv_video.so
Failed to wrapper hybrid_drv_video.so
Setting pipeline to PAUSED ...
failed to open /usr/lib64/dri/hybrid_drv_video.so
Failed to wrapper hybrid_drv_video.so
Pipeline is PREROLLING ...
Got context from element 'vaapiencodeh264-0': gst.vaapi.Display=context,
gst.vaapi.Display=(GstVaapiDisplay)"\(GstVaapiDisplayWayland\)\
vaapidisplaywayland0";
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps =
video/x-raw, width=(int)320, height=(int)240, framerate=(fraction)30/1,
format=(string)NV12, multiview-mode=(string)mono,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Internal data stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

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