[Bug 665751] New: video: need API to query formats supported by composition_blend()

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=665751
  GStreamer | gst-plugins-base | git

           Summary: video: need API to query formats supported by
                    composition_blend()
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


An element like textoverlay should be able to somehow query the formats
supported by gst_video_overlay_composition_blend(), so it can build the right
template caps. This could just be a define for a template caps string, but
something more dynamic might be nice to have too.

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