[Bug 785120] New: playbin3: Supporting subtitle only input is unstable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785120

            Bug ID: 785120
           Summary: playbin3: Supporting subtitle only input is unstable
    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: ---

DASH + subtitle playback using playbin3 has multiple issues.
- Too early unblocking of decodebin3 srcpad depending on collection arrival
time.
==> Assume the mpd has A/V/T streams. If the collection of video arrives before
Text, is ok. But if Text came first and then Audio does (not yet video),
playbin3 unblock and link them without video. Current playsink doesn't support
text only sink.
- Unexpected DecodebinInputStream removal. 
==> Before configuration of A/V input, Text input can be configured with EOS.
Then, when A/V is configured, it removes the Text's streams. We shouldn't
remove other parsebin's input.
- Premature GstStream object is exposed.

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