subclass gstbin to overwrite handle_message

[Eloi Bail]

>
> You should either register the bin or just create as any other GObject.
>

I tried to register the bin. I follow the similar way than
rtsp-media-factory-uri, subclass of rtsp-media-factory.

See in attachment. It is still not working and I honnestly do not know how
to troubleshoot that.
Any help would be appreciated.

Thanks,
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