Playback of a video stream is slow under GTK

[Mathieu Duponchelle]

The property was added in February 2017, so as far as I can tell you need at least 1.12,
possibly 1.14

On 7/31/19 6:21 PM, pisymbol . wrote:
>
>
> On Wed, Jul 31, 2019 at 8:09 AM Nicolas Dufresne <nicolas at ndufresne.ca <mailto:nicolas at ndufresne.ca>> wrote:
>
>     Le mardi 30 juillet 2019 à 09:45 -0400, pisymbol . a écrit :
>     >
>     >
>     > On Mon, Jul 29, 2019 at 8:00 PM Nicolas Dufresne <nicolas at ndufresne.ca <mailto:nicolas at ndufresne.ca>> wrote:
>     > >
>     > > Le lun. 29 juill. 2019 19 h 56, pisymbol . <pisymbol at gmail.com <mailto:pisymbol at gmail.com>> a écrit :
>     > > >
>     > > > On Mon, Jul 29, 2019 at 5:51 PM Mathieu Duponchelle <mathieu at centricular.com <mailto:mathieu at centricular.com>> wrote:
>     > > > > I've never seen that, but a test case would probably be helpful :)
>     > > > >
>     > > >
>     > > > Not sure what exactly to share:
>     > > >
>     > > > Here is the gist of the code:
>     > > >
>     > > > class GstPlayerWdiget(Gtk.Box):
>     > > > ....
>     > > >        self.play_pipeline = Gst.Pipeline()
>     > > >        factory = self.play_pipeline.get_factory()
>     > > >        gtksink = Gst.ElementFactory.make('gtksink', None)
>     > > >        gtksink.set_property("sync", False)
>     > >
>     > > By disabling the sync, you ask GStreamer to play all frames, even when real-time isn't possible due to cpu limitation. So slow motion on this entirely software pipeline is what you have asked GStreamer.
>     > >
>     > > If you have multiple cores, consider configuring videoconvert to use more then one thread, or add queues at well chosen places (e.g. between decoder and converter).
>     > >
>     >
>     > Nicholas, pardon my ignorance, but how does configuring videoconvert use more than one thread?
>
>     There is a property called n-threads, 0 mean as many as there is CPU,
>     and then any other value will try and use that specific amount of
>     threads. In python that would be:
>
>       converter.props.n_threads = N
>     or
>       converter.set_property("n-threads", N)
>
>
> Is this on newer releases? I ask because now I see it in the online doc but not using `gst-inspect-1.0 videoconvert` as an element property?
>
> -aps
>
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