[Bug 744028] New: video-converter: Converter doesn't work properly when offsets are specified

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=744028
  GStreamer | gst-plugins-base | unspecified

           Summary: video-converter: Converter doesn't work properly when
                    offsets are specified
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ravi.kiran at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


In videobox, I tried to use video-converter APIs for format conversions.
While creating a new converter, I provided configuration structure with 
GST_VIDEO_CONVERTER_OPT_SRC_X, SRC_Y, DEST_X and DEST_Y as offsets.
for pipeline, 
gst-launch-1.0 videotestsrc ! "video/x-raw,format={AYUV}" ! videobox left=-20
top=-20 ! "video/x-raw,format={BGRA}" ! videoconvert ! ximagesink
DEST_X = DEST_Y = 20

Expected result: Borders should be added at left and top.
Actual result: Borders were at right and bottom.

Video-converter fetches a fast path for this conversion, which uses ORC
generated conversion function.
And they do not consider x and y offsets, hence borders weren't added at left
and top.

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