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This fixes
picamera.exc.PiCameraMMALError: no buffers available: Resource temporarily unavailable
when dealing with raw mmalobj and overlays.What seems to happen is that we try to send buffers all the time instead of only doing it on port that is an output. This fixes it for me and I have not seen any issues as a result.
Let me know if this is good enough for inclusion or if you want me to do additional digging.
(For some reason I was not able to monkeypatch this from my code, probably because my python is somewhat limited)