[Bug 790149] New: vaapipostproc: Does not maintain aspect ratio when scaling

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790149

            Bug ID: 790149
           Summary: vaapipostproc: Does not maintain aspect ratio when
                    scaling
    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: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

When vaapipostproc is being used (notably through vaapidecodebin), the
vaapipostproc may endup scaling the video. The problem is that the scaling does
not maintain the aspect ratio, which is totally unexpected default behaviour.
On can illustrace this with a non scaling display sink.

gst-launch-1.0 videotestsrc ! video/x-raw,width=320,height=240 ! vaapipostproc
! ximagesink

In comparison with:

gst-launch-1.0 videotestsrc ! video/x-raw,width=320,height=240 ! videoscale !
ximagesink

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