to-dev: fix(webrtc): reuse existing Receiver when remote switches payload type mid-session

pkg/webrtc/producer.go

@@ -34,6 +34,22 @@ func (c *Conn) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, e
 		// Passive producers: OBS Studio via WHIP or Browser
 		// Active producers: go2rtc as WebRTC client or WebTorrent
 
+		// Some remote peers (observed with Nest/SDM WebRTC) start sending
+		// media on a different payload type than the one originally wired
+		// to consumers (e.g. switch from PT 96 to PT 98 mid-session for the
+		// same video media, without a renegotiation). Since each payload
+		// type is a distinct *Codec pointer, the exact-codec lookup above
+		// misses and a brand-new, unwired Receiver would otherwise be
+		// created for it, silently starving every already-connected
+		// consumer. Reuse the existing Receiver for this Media instead, so
+		// already-wired Senders keep receiving packets regardless of which
+		// declared payload type the remote actually transmits on.
+		for _, track := range c.Receivers {
+			if track.Media == media {
+				return track, nil
+			}
+		}
+
 	default:
 		panic(core.Caller())
 	}