[Bug 740565] dvdsub to kate subtitle transcoding fails after first subtitle for ogg container

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740565
  GStreamer | gst-plugins-bad | 1.2.4

Vincent Penquerc'h <vincent.penquerch> changed:

           What    |Removed                     |Added
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                 CC|                            |vincent.penquerch at collabora
                   |                            |.co.uk

--- Comment #6 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-12-17 14:16:16 UTC ---
Pretty intricate issue in collectpads, it seems.

I think the semantics of "queued" in collectpads were inconsistent. The
attached patches fix the bug on the supplied command line and test file.

It would be good if someone more familiar with collectpads could double check
the patch.

Additionally, a patch to oggmux was needed to ensure "free" pad buffer is
replaced from collectpads, to avoid collectpads deadlocking, waiting for the
colletpads buffer to be moved.

Such a change to collectpads feels rather invasive, so may have side effects in
other places. Passes core and -base tests, at least.

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