title: Audio track from remote mediastream is not playing in <video> tag
body: <p>I'm working with webRTC on a project. Everything is connecting and working the first go-round. Both parties receive video/audio appropriately. The audio and video are being recorded on one side of the connection.</p>
  <p>I am allowing video and audio muting, as well as screen-share, by calling <code>replaceTrack()</code> on the appropriate peer connection senders.</p>
  <p>Peer A <em>(who is recording audio and video from their local stream and remote stream)</em> switches audio <em>or</em> video inputs. The change works perfectly and shows on both Peers.</p>
  <p>Peer B terminates the connection.</p>
  <p>Peer A then goes into listening mode, waiting for Peer B to come back.</p>
  <p>Peer B initiates connection and the connection is made. Peer A can see, hear and record Peer B. Peer B can see Peer A, but not hear them. If Peer A changes an audio source, then Peer B can hear again just fine.</p>
  <p>Here's what I cannot figure out: In the lull where Peer B can see but not hear Peer A, the video element for Peer B shows that its source is a mediastream with a live, unmuted, enabled audio track, and alive, unmuted, enabled video track. Here is the log of the audio track:</p>
  <p><a href="https://i.stack.imgur.com/LVJz6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LVJz6.png" alt="enter image description here" /></a></p>
  <p>Any ideas or thoughts on why the Audio - represented by the log above - would not be playing. Keep in mind, the video is playing just fine at this point. I've already had user gesture here, so that shouldn't come into play.</p>