[Bug 747790] New: videoscale method=bilinear2 and UYVY/YUY2 distortion

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747790

            Bug ID: 747790
           Summary: videoscale method=bilinear2 and UYVY/YUY2 distortion
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fzwoch at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Videoscale element with new method=bilinear2 is buggy with UYVY/YUY2 (maybe
other 4:2:2(?) modes as well?).

Sample pipeline as follows:

gst-launch-1.0 videotestsrc ! video/x-raw,width=1920,height=1200,format=UYVY !
videoscale method=bilinear2 ! video/x-raw,width=960,height=600 ! videoconvert !
autovideosink

On the right hand side there are a few pixel columns with distorted colors -
most likely uninitialized memory.

I could not easily track down where the problem originates from :/ else I would
have tried to fix it myself. I really like the new "bilinear2" moden, it offers
a nice performance / quality ratio.

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