request-aux-sender not available in webrtcbin (thus rtpgccbwe seems not working)
I'm developing in Python and want to implement something inspired by webrtcsink to leverage rtpgccbwe. In webrtcsink/imp.rs it also goes with webrtcbin.connect_closure("request-aux-sender",...). However, in the current webrtcbin implementation, signal request-aux-sender seems to be disabled, so the error occurs: "TypeError: <__gi__.GstWebRTCBin object at 0x7f1003416980 (GstWebRTCBin at 0x1d941b0)>: unknown signal name: request-aux-sender". Seems in the newest implementation, request-aux-sender hook is moved to rtpbin so I can only connect the signal to rtpbin. But from rtp/gcc/imp.rs, it describes the element (rtpgccbwe) should be placed right before rtpsession. May I know in this case how could I hook the rtpgccbwe into the pipeline and enable it?
Besides, is that inconsistency across APIs or if I need to install something else to enable request-aux-sender in webrtcbin?
Thanks.