[Bug 738931] decodebin2: Group never exposed with some GAP'ed streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=738931

--- Comment #5 from Wonchul Lee <chul0812 at gmail.com> ---
Created attachment 300112
  --> https://bugzilla.gnome.org/attachment.cgi?id=300112&action=edit
decodebin never be exposed level5 full log

I met a same issue with sparse audio mkv stream. The content has three streams,
one video and two audio.
The second audio stream is sparse stream and it has empty stream at the
beginning of the contents.
So, mkv demuxer created all of its srcpad, and emit no-more-pads signal.
But the group never be exposed due to one of the chain(sparse audio) will never
complete.

I attach related log at first.

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