Aggiunge overlay server-side burn-in e stabilizza diretta live.

Tabellone, badge e brand sono ricodificati nel flusso _air via OverlayRelay;
sync punteggio HTTP, volume condiviso rails/sidekiq, qualità 720p migliorata
e badge CONNECTING in ripresa da pausa.

Co-authored-by: Cursor <cursoragent@cursor.com>

infra/mediamtx.yml

@@ -22,11 +22,15 @@ rtmpAddress: :1935
 hls: yes
 hlsAddress: :8888
 hlsVariant: mpegts
+# Allineato a slate (1s) e camera; evita salti 1s→6s che glitchano HLS.js
+hlsSegmentDuration: 1s
+hlsSegmentMaxSize: 50M
 
 pathDefaults:
   source: publisher
   overridePublisher: yes
-  record: yes
+  # Recording solo via job dedicato: il recorder inline crasha il muxer HLS al switch slate→live
+  record: false
   recordPath: /recordings/%path/%Y-%m-%d_%H-%M-%S
   recordSegmentDuration: 60s
   recordDeleteAfter: 48h
@@ -37,9 +41,5 @@ paths:
   # match_{uuid}:
   #   alwaysAvailable: true
   #   alwaysAvailableFile: /slates/offline.mp4
-  #   alwaysAvailableTracks:
-  #     - codec: H264
-  #     - codec: MPEG4Audio
-  #       sampleRate: 48000
-  #       channelCount: 2
+  # (non usare alwaysAvailableTracks insieme al file — MediaMTX >= 2026.02)
   all_others: