From d0a922476e417d37e41f535c456ac983e8909e80 Mon Sep 17 00:00:00 2001
From: Jaya Allamsetty <jaya.allamsetty@8x8.com>
Date: Wed, 14 Feb 2024 17:02:39 -0500
Subject: [PATCH] fix(TPC): Reset the scalabilityMode for VP8. Set the
 scalabilityMode to undefined for VP8 after a VP9->VP8 switch even though the
 browser returns L1T2 in the RTCRtpSender.getParameters() call. Fixes an issue
 where the bridge stops forwarding video for some participants after vp8->vp9
 switch.

---
 modules/RTC/TraceablePeerConnection.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/RTC/TraceablePeerConnection.js b/modules/RTC/TraceablePeerConnection.js
index 4cf674e1c8..d331e3aecb 100644
--- a/modules/RTC/TraceablePeerConnection.js
+++ b/modules/RTC/TraceablePeerConnection.js
@@ -2324,6 +2324,8 @@ TraceablePeerConnection.prototype._updateVideoSenderEncodings = function(frameHe
             // Configure scalability mode when its supported and enabled.
             if (scalabilityModes) {
                 parameters.encodings[encoding].scalabilityMode = scalabilityModes[encoding];
+            } else {
+                parameters.encodings[encoding].scalabilityMode = undefined;
             }
         }
     }