[Bug 701430] New: For audio / video mixing in gst-editing-services, we need to use metadatas.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701430
  GStreamer | gst-plugins-base | git

           Summary: For audio / video mixing in gst-editing-services, we
                    need to use metadatas.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mathieu.duponchelle at epitech.eu
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Context :

Sebastian Dröge just implemented a volume property on adder pads. We have an
adder for each audio track, and each track element has a volume element
upstream.

We would need volume to negotiate a Meta if adder is present downstream, and
let adder do the volume modifications in that case.

Ideally, we would like to have the same system for videomixer, to let it handle
alpha and [x, y, z] coordinates. The problem is that we don't know which
element could be placed upstream to negotiate these metas. Videobox, as far as
I understand, does not do exactly that, it handles alpha but doesn't handle [x,
y, z] the same way videomixer does.

What do you think would be the best way to expose these properties ?

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