Slightly better streams maybe

apps/rpc.js

 const screen = {}
 
 function setStream({source, stream}) {
+    if(streams[source] && streams[source].id !== stream.id) {
+        streams[source].getTracks().forEach(track => track.stop())
+    }
+
     streams[source] = stream
     m.redraw()
 
     const stream = streams[State.username]
     if(stream) {
         stream.getTracks().forEach(track => {
-            try {rpc.addTrack(track, stream) }
+            try { rpc.addTrack(track, stream) }
             catch { }
         })
     }

apps/streams.js

         )
         .catch(e => console.log(e))
     }
+    else {
+        const stream = new MediaStream()
+        signal({kind: 'stream', value: {source: State.username, stream}})
+    }
 }
 const Video = {
     setUp: (username) => ({dom}) => {