Gstreamer / Multithreading problem

[Nicolas Dufresne]

Le ven. 5 oct. 2018 08 h 41, klex0 <alex at kordecki.de> a écrit :

> Hello,
>
> I use Gstreamer together with the Python Twisted Framework. There seems to
> be a race condition when sending events in the pipeline.
> With many parallel pipelines which I dynamically create and terminate, a
> thread hangs reproducibly in the marked line. This seems to happen during a
> context switch of a twisted thread within this line.
>
> log.msg("TERM: gen EOS")
> eos = Gst.Event.new_eos()
> log.msg("TERM: send EOS")
> self.pipeline.send_event(eos)           <-- Here it hangs
> log.msg("TERM: EOS sent to pipline")
>
> Has anyone an idea about this ?
>

Interactions between GStreame and the Python run-time is single threaded.
As a side effect, some cause that is supposed to run in seperate thread may
cause deadlocks.

I have heard that recent Python API could help with this, but that would
need some rework of the GObject auto-generated bindings (and research, and
load of testing).

Best is to add a small native layer that deals with the threaded callbacks,
or avoid threaded callbacks.


> Regards,
> alex
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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