[Bug 785706] New: vaapipostproc caps negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785706

            Bug ID: 785706
           Summary: vaapipostproc caps negotiation
    Classification: Platform
           Product: GStreamer
           Version: 1.12.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: rataj28 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Created attachment 356755
  --> https://bugzilla.gnome.org/attachment.cgi?id=356755&action=edit
GST_DEBUG=5

Hi,

Following pipelines are not working:

gst-launch-1.0 appsrc is-live=true
caps="video/x-raw,format=BGRx,width=1280,height=1024,framerate=20/1" !
videorate ! vaapipostproc ! video/x-raw,format=NV12,framerate=10/1 ! fakesink

gst-launch-1.0 appsrc is-live=true
caps="video/x-raw,format=BGRx,width=1280,height=1024,framerate=20/1" !
videorate ! video/x-raw,framerate=10/1 ! vaapipostproc !
video/x-raw,format=NV12 ! fakesink

with warning:

WARN           basetransform
gstbasetransform.c:1346:gst_base_transform_setcaps:<videorate0> transform could
not transform video/x-raw, format=(string)BGRx, width=(int)1280,
height=(int)1024, framerate=(fraction)20/1 in anything we support 

Pipeline with swapped vaapipostproc and videorate is working correctly:

gst-launch-1.0 appsrc is-live=true
caps="video/x-raw,format=BGRx,width=1280,height=1024,framerate=20/1" !
vaapipostproc ! videorate ! video/x-raw,format=NV12,framerate=10/1 ! fakesink

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