[Bug 778015] New: playbin3/decodebin3: Cannot re-enable track by select-streams event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778015

            Bug ID: 778015
           Summary: playbin3/decodebin3: Cannot re-enable track by
                    select-streams event
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sh.yang at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Track selection on playbin3 can possible by using select-streams event.
Also, by select-streams event, audio/video/text track can be disabled.

However, there are two bugs now, in playbin3/decodebin3

<re-enable a track never work>
More specifically, let's assume that we have one audio track and one video
track.
When application sent select-streams event which includes only video track's
stream-id, decodebin3 would remove audio decoder.
Then, if application re-send new select-streams event which has stream-ids of
video/audio, new audio decoder element never be made.

<Segfault on playbin3>
By following sequence, segfault happen.
start playback -> disable a track -> unload pipeline

See also bug #775469

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