Application did not provide a wayland display handle

[kevan.lan]

I want qt mutimedia use waylandsink to play video,so "export
QT_GSTREAMER_WINDOW_VIDEOSINK=waylandsink".
But the waylandsink plugin in the gst-plugins-bad told me: "Application did
not provide a wayland display handle.waylandsink cannot use an
externally-supplied surface without an externally-supplied display handle.
Consider providing a display handle from your application with GstContext"

Anybody have tried this? Any suggestion? How can the application supply a
wl_surface handle for the sink to use?



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