[Bug 778010] New: vaapipostproc: doesn't scale according to src caps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778010

            Bug ID: 778010
           Summary: vaapipostproc: doesn't scale according to src caps
    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: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Test pipeline that doesn't work.
gst-launch-1.0 videotestsrc ! video/x-raw,width=1920,height=1080 !
vaapipostproc ! video/x-raw,format=I420,width=800,height=600 ! xvimagesink

Test pipeline that works.
gst-launch-1.0 videotestsrc ! video/x-raw,width=1920,height=1080 !
vaapipostproc width=800 height=600 ! video/x-raw,format=I420 ! xvimagesink

This is because it doesn't set GST_VAAPI_POSTPROC_FLAG_SIZE to postproc's flag
in this case. Currently, only if width/height property is set by user, it does
set.

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