[Bug 774781] New: iqa does not take buffer formats into account

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774781

            Bug ID: 774781
           Summary: iqa does not take buffer formats into account
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lrn1986 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

How to reproduce:
* Take two video streams, put them through iqa.
* Observe the result.
* Put videoconvert elements and capsfilters before iqa sinkpads and convert one
stream into I420, the other to, say, BGRA.
* Observe that the result is different now.

Expected result:
iqa refuses to compare streams with different formats
OR
iqa internally (by itself or inside dssim library) converts streams into the
same format as needed

Actual result:
iqa passes buffers from both streams to dssim, claiming that the streams have
RGBA format, regardless of the actual stream format

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