[Bug 733169] New: decodebin: improve deadend pads handling

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733169
  GStreamer | gst-plugins-base | unspecified

           Summary: decodebin: improve deadend pads handling
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          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: ---


Currently deadend pads aren't properly handled for pad switching. The following
patches fix this situation.

The issues happen when:
1) A deadend pad is present on a group that has finished (eos on all pads). As
it isn't considered drained it will prevent group switching

2) All pads are deadend on a group, leading to an error about no buffers being
pushed on a pad before EOS, even when there is already a next group to expose.

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