In gstreamer there is a rfbsrc video source. With this example in mind, it would be neat if xpra were similarly usable as a src able to connect to existing xpra servers. It would perhaps also be neat if it were usable as a generic gstreamer sink that could have a/v played into it & act as a server.
With a xprasrc for example, one should be able to create a Rygel GstLaunch MediaServer that allows UPnP devices to- via the gstlaunch plugin- get their video transcoded from Xpra into UPnP/DLNA.
Too much work.
FYI: we already have native RFB support: wiki/RFB
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1391