[Bug 781816] New: Red artifact on visualizing rtsp stream via gstreamer and qt5

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781816

            Bug ID: 781816
           Summary: Red artifact on visualizing rtsp stream via gstreamer
                    and qt5
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: qt-gstreamer
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: toonheyrman at hotmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I've written a c++ program that receives a RTSP stream via gstreamer and
displays this video via Qt5 in a QWidget. As the gstreamer videosink, I use a
Widgetqt5glvideosink. 

The problem is when I look at the received stream it has too much red-value in
it. This only occurs when the vertical resolution exceeds +-576 pixels. (lower
resolutions have no issue)
 When I use cpu rendering (Widgetqt5videosink) instead of openGL rendering i
get a correct image.
 When I view the stream via gstreamer command line or via VLC it is also
correct. RTP stream is also too red. 

So it likes to be an issue when using an openGL rendered QWidget. 

Info:
 Tested on Ubuntu16.04 and 17.04 for the viewer application. And on three
different devices. 

Links:
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/qt-gstreamer/html/qtvideosink_overview.html

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