[Bug 744420] splitmuxsink - Deadlock on while starting 2nd fragment on function gst_element_sync_state_with_parent

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744420

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
                 CC|                            |t.i.m at zen.co.uk
     Ever confirmed|0                           |1

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Can't reproduce this here with a local RTSP stream, but it might well be racy.
gst_element_sync_state_with_parent() is known to be a bit problematic, see bug
#722767.

I also don't see anything in splitmuxsink that intercepts
GST_MESSAGE_ASYNC_START/DONE messages, which it should perhaps do so we don't
mess with the state of the pipeline, the sink should act as a sink that does an
async-start/done preroll at the beginning, but not for every file chunk IMHO.

And maybe we should also flag the element as sink.

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