[Bug 776492] New: videoscale : Quality issue with few alogorithms(methods) 3,6,8,9

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776492

            Bug ID: 776492
           Summary: videoscale : Quality issue with few
                    alogorithms(methods) 3,6,8,9
    Classification: Platform
           Product: GStreamer
           Version: 1.10.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jagadishkamathk at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 342475
  --> https://bugzilla.gnome.org/attachment.cgi?id=342475&action=edit
Input output files

Hi,

I'm seeing some quality issue with videoscale while downscaling from 1080p and
360p. Thick visible lines are seen at certain places. Also, periodic prints
"can't find exact taps" are seen whenever such lines are seen in output

Pipeline : gst-top-1.0 gst-launch-1.0 filesrc location=input.jpg ! decodebin !
videoscale method=9 ! video/x-raw,width=640,height=360 ! videoconvert ! pngenc
! filesink location=/root/out.png

The issue is seen for method=3,6,8 and 9

Attached zip containing input/output files

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