[Bug 704852] New: Videomixer fails to preroll when different formats are requested on its sink pads.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704852
  GStreamer | gst-plugins-good | git

           Summary: Videomixer fails to preroll when different formats are
                    requested on its sink pads.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mathieu.duponchelle at epitech.eu
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


As shown by :

gst-launch-1.0 videotestsrc ! videoconvert ! video/x-raw, format=I420 !
videomixer name=m ! autovideosink videotestsrc ! videoconvert ! video/x-raw,
format=RGBA ! m.

videomixer goes in an infinite negotiation loop.

That can be solved fairly easily I believe, but another problem arises:

What shall videomixer do when for example a first pad is negotiated without an
alpha channel,
then a second one with alpha tries to negotiate ?

It would be nice to have videomixer renegotiate the existing pads to respect
alpha.

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