Audio downtrack stop sending after a new participant joins.

[davidzhao]

Describe the bug
This is a tricky one. Sometimes in a room, when a new participant joins, one of the existing participant would lose one of their subscribed tracks. The track is supposedly still there, and the new participant could hear everyone. But a single person would stop being able to hear another but still be able to hear everyone else.

Server

• Version: 0.10.4
• Environment: EKS/Kubernetes

Client

• SDK: React
• Version: 0.3.11

To Reproduce
Steps to reproduce the behavior:

1. two users in an audio room (russ and I)
2. another user joins
3. I stopped getting russ's audio, with webrtc-internals showing packetReceived/s going to 0
4. russ and the new user could hear each other fine.

The issue happens when a new downtrack is added to the receiver. it seems that one of the existing downtracks get dropped or somehow stops receiving data.

[davidzhao]

[davidzhao]

#50 includes improvements to track getting wrong timestamps back after muting. Will verify in tests.

[davidzhao]

fixed in #50