tune voice quality and monitor media health

README.md

@@ -20,6 +20,8 @@ PORT=8081 npm start
 - Custom STUN/TURN: gear icon → JSON override in `localStorage`, applied on
   next join. Server default comes from env (below).
 - Mute (M), deafen (D), per-peer volume, speaking indicators.
+- Voice capture uses mono 48 kHz Opus-oriented settings, a 64 kbps audio ceiling,
+  and periodic packet-loss, jitter, and RTT quality diagnostics.
 
 ## ICE configuration (server side)
 
@@ -49,5 +51,7 @@ service instead of depending on NAT hairpinning or direct candidate pairs.
   behind the preview ingress (use wss/TLS in front for real deploys).
 - No media server: N² mesh — fine for small rooms, needs SFU (mediasoup/livekit)
   beyond ~6–8 participants.
+- For larger rooms or consistently lower bandwidth, replace the mesh with an SFU;
+  the current quality tuning improves the P2P path but does not change its N² cost.
 - Text channels are decorative. No persistence, no rate limiting.
 - Screen-share negotiation storms on join/leave are expected at small scale.