[Bug 655279] New: [playbin2] Don't reset sinks when not needed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=655279
  GStreamer | gst-plugins-base | git

           Summary: [playbin2] Don't reset sinks when not needed
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bilboed at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When playing back chained multi-streams, we end up triggering playbin2's
no_more_pads_cb during the playback of one file.

When no non-NULL audio/video/text sinks are specified, that code will end up
resetting playsink's internal sinks to NULL (instead of the previously
auto-selected sinks).

This will cause the previously configured sinks to be set to NULL, resulting in
any stream currently pushing in those sinks to return with
GST_FLOW_WRONG_STATE... eventually making the upstream elements stop without
any warning.

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