[Bug 734683] New: playsinkconvertbin: returns true from accept caps but rejects it later

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734683
  GStreamer | gst-plugins-base | git

           Summary: playsinkconvertbin: returns true from accept caps but
                    rejects it later
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: thiagossantos at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


playsinkconvertbin query_caps/accepts_caps handlers return that it can accept
video/x-raw(OverlayMeta) when the downstream sink can accept it. This should be
easily testable using playbin with fakesink.

The issue is that when it receives the caps event it will try to set this to
the internal elements (as it is a raw format) and videobalance doesn't support
it, so the caps fails and the pipeline errors out with not-negotiated.

Related to: https://bugzilla.gnome.org/show_bug.cgi?id=720345

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