[Bug 782959] New: glimagesink does not seem to honor gst_video_overlay_set_render_rectangle

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782959

            Bug ID: 782959
           Summary: glimagesink does not seem to honor
                    gst_video_overlay_set_render_rectangle
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: severin at guakamole.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

In pdfpc (a PDF presentation tool that support displaying videos linked into a
PDF as overlays), we switched from xvimagesink to glimagesink due to
client-side decoration issues with xvimagesink (detail here:
https://github.com/pdfpc/pdfpc/issues/197#issuecomment-297718608 ).

It appears however that glimagesink does not honor the `set_render_rectangle` (
https://github.com/pdfpc/pdfpc/blob/master/src/classes/action/movie.vala#L318
): when xvimagesink is used, the video is properly framed and positioned on top
of the PDF page. However, when replacing xvimagesink by glimagesink, the video
is displayed using the entirety of the parent window, seemingly ignoring
set_render_rectangle.

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