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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Currently it looks like everything is marshalled in the thread running a GMainLoop, GStreamer doesn't even require a MainLoop and GstObject are MT safe... we should unref directly from the GC thread.