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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from LRN <lrn1986 at gmail.com> ---
Created attachment 340410
  --> https://bugzilla.gnome.org/attachment.cgi?id=340410&action=edit
an image with three pixels (G, R and B)

Use these two images like this:

gst-launch-1.0 multifilesrc location="rgb.png" index=0
caps="image/png,framerate=\(fraction\)12/1" ! pngdec ! videoconvert !
"video/x-raw,format=RGBA" ! iqa name=iqa do-dssim=true ! videoconvert !
autovideosink sync=false multifilesrc location="grb.png" index=0
caps="image/png,framerate=\(fraction\)12/1" ! pngdec ! videoconvert !
"video/x-raw,format=RGBA" ! iqa.

then change one of the capsfilters from RGBA to I420

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