[Bug 767921] New: videoscale: artifacts on still video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767921

            Bug ID: 767921
           Summary: videoscale: artifacts on still video
    Classification: Platform
           Product: GStreamer
           Version: 1.8.1
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: elezegarcia at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

It seems that using videoscale to downscale interleaved still video, I420
format, would produce artifacts. The original image does not have any
artifacts.

I can reproduce it with this pipeline:

gst-launch-1.0 -v v4l2src norm=NTSC device=/dev/video0 ! videoconvert !
video/x-raw,format=I420,width=720,height=480 ! videoscale !
video/x-raw,width=360,height=240 ! jpegenc ! multifilesink location=bad-%d.jpg

Where as these pipelines produce no-artifacted frames:

gst-launch-1.0 -v v4l2src norm=NTSC device=/dev/video0 ! videoconvert !
deinterlace method=weave ! video/x-raw,format=I420,width=720,height=480 !
videoconvert ! videoscale ! video/x-raw,width=360,height=240 ! jpegenc !
multifilesink location=good-%d.jpg

gst-launch-1.0 -v v4l2src norm=NTSC device=/dev/video0 ! videoconvert !
video/x-raw,format=YUY2,width=720,height=480 ! videoconvert ! videoscale !
video/x-raw,width=360,height=240 ! jpegenc ! multifilesink location=good-%d.jpg

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