webrtcbin: Input caps changes handling
I have a test case in WebKit where the PeerConnection is initially configured for VP8 sending and then re-configured to send H.264. In webrtcbin the sink pad receives a CAPS event, but doesn't re-trigger negotiation. There is a FIXME about this which might be related in _check_if_negotiation_is_needed()
: /* FIXME: emit when input caps/format changes? */