[Bug 776172] New: videoconverters, videotestsrc, etc: Wrongly claim to do multiview-mode conversion

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776172

            Bug ID: 776172
           Summary: videoconverters, videotestsrc, etc: Wrongly claim to
                    do multiview-mode conversion
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: thaytan at noraisin.net
     GNOME version: ---

> gst-launch-1.0 videotestsrc ! videoconvert ! "video/x-raw,multiview-mode=top-bottom" ! fakesink -v

Problem here is that basetransform and everything else is doing a caps query
downstream, and then intersect. The field not existing in the upstream caps
then causes the field to get the downstream value.
Which would be no problem if the absence would not mean anything. It however
means the same as multiview-mode=mono.

So all these elements will have to ensure that they will handle it like mono
and never ever output different multiview-mode unless the input had that
different multiview-mode already.

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