[Bug 788626] New: Border artifact in simple pipelines.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788626

            Bug ID: 788626
           Summary: Border artifact in simple pipelines.
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: btsloane at verizon.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 361081
  --> https://bugzilla.gnome.org/attachment.cgi?id=361081&action=edit
Output with -v flag and GST_DEBUG=xvimage*:6

Simple video pipelines render with a 1px green border around the entire image.

I have seen this with the following two pipelines:

gst-launch-1.0 filesrc location=/ram/test.mkv !  decodebin ! videoconvert !
xvimagesink

gst-launch-1.0 -v playbin uri="file:///ram/test.mkv"

Adding a videocrop element to the pipeline avoids the issue. Even if I only
crop one side, the border disapears on all 4 (cropping 0 sides leaves the
border):

gst-launch-1.0 filesrc location=/ram/test.mkv !  decodebin ! videoconvert !
videocrop left=1 ! xvimagesink

The border is generally green, but will switch to being multi-colored with no
pattern that I have noticed.

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