Fix AV1 when SDP reports RTP/AVPF (RTP with Feedback via RTCP for keyframe requests

Author: RogerHardiman

lib/RTSPClient.ts

@@ -23,6 +23,7 @@ import {
 import * as transform from "sdp-transform";
 import RTPPacket from "./transports/RTPPacket";
 const RTP_AVP = "RTP/AVP";
+const RTP_AVPF = "RTP/AVPF"; // Used by AV1. This is RTP with Feedback (via RTCP) to request Keyframes via RTCP
 
 const STATUS_OK = 200;
 const STATUS_UNAUTH = 401;
@@ -267,7 +268,7 @@ export default class RTSPClient extends EventEmitter {
       );
     }
 
-    // For now, only RTP/AVP is supported. (Some RTSPS servers use RTP/SAVP)
+    // For now, only RTP/AVP and RTP/AVPF are supported. (Some RTSPS servers use RTP/SAVP)
     const { media } = transform.parse(describeRes.mediaHeaders.join("\r\n"));
 
     // Loop over the Media Streams in the SDP looking for Video or Audio
@@ -315,7 +316,7 @@ export default class RTSPClient extends EventEmitter {
 
       if (
         mediaSource.type === "video" &&
-        mediaSource.protocol === RTP_AVP &&
+        (mediaSource.protocol === RTP_AVP || mediaSource.protocol === RTP_AVPF) &&
         mediaSource.rtp[0].codec === "AV1"
       ) {
         this.emit("log", "AV1 Video Stream Found in SDP", "");