[Bug 791412] New: videconvert: Should not forward crop meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791412

            Bug ID: 791412
           Summary: videconvert: Should not forward crop meta
    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: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Since 2012 videoconvert blindly pretend to support all meta found on downstream
allocation query. This seems kind of error prone, and in fact it's totally
wrong for the crop meta.

When crop meta is added upstream, the caps width/height are reduces to the
cropped width/height. As a side effect, the newly allocated buffers in
videoconvert are of that size. Because it does not know, videoconvert will in
fact crop as if the top/left crop was zero. The result being completly wrong.

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