Video playback in GTK

[Irene Kravets]

I am using Wayland/Weston with GTK and trying to write a Python script to display video on the screen.  I have a GTK window with a grid and I just add the widget below to the grid.  Video is very choppy.  It looks much smoother if I play it from Linux command line using gst-launch-1.0.

Here is my code for the widget:

class VideoWidget(Gtk.Frame)
    def __init__(self)
        super().__init__()
        Gst.init(None)
        Gst.init_check(None)
        self.player = Gst.ElementFactory.make("playbin")
        self.connect('realize', self.on_realize)
        self.player.set_property("uri", "https://www.radiantmediaplayer.com/media/big-buck-bunny-360p.mp4")

    def on_realize(self, widget):
        self.gtksink = Gst.ElementFactory.make("gtksink")
        self.player.set_property("video-sink", self.gtksink)
        self.add(self.gtksink.props.widget)
        self.show_all()
        self.player.set_state(Gst.State.PLAYING)

I saw mentions of "waylandsink" that can be used instead of "gtksink", but I couldn't figure out how to use it, since I don't know how to get Gtk.Widget from "waylandsink".  I can get it to display in its own window, but I need to be able to control where it goes on the screen.

Does anyone have any examples of how to use "waylandsink" with GTK?  I don't have XWayland on my box.  Any other suggestions on how to make playback less choppy?

Thank you,
Irene.
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