fix: recorder drop audio (-an) — cameras use pcm_mulaw which MP4 doesn't support

main.go

@@ -62,6 +62,16 @@ func main() {
 	snaps.StartAll(cfg.Cameras)
 	app.snapshots = snaps
 
+	// Start FFmpeg recorder for all enabled cameras.
+	rec := NewRecorderManager(cfg.Storage)
+	rec.StartAll(cfg.Cameras)
+	app.recorder = rec
+
+	// Start retention cleaner.
+	cln := NewCleaner(cfg.Storage)
+	go cln.Start()
+	app.cleaner = cln
+
 	// Start the HTTP server (blocks).
 	errCh := make(chan error, 1)
 	go func() {
@@ -110,6 +120,8 @@ type App struct {
 	server     *Server
 	go2rtc     *Go2RTCManager
 	snapshots  *SnapshotEngine
+	recorder   *RecorderManager
+	cleaner    *Cleaner
 }
 
 // StartServer initializes and starts the HTTP server.
@@ -124,6 +136,12 @@ func (a *App) StartServer() error {
 
 // Shutdown performs a graceful shutdown of all services.
 func (a *App) Shutdown() {
+	if a.recorder != nil {
+		a.recorder.StopAll()
+	}
+	if a.cleaner != nil {
+		a.cleaner.Stop()
+	}
 	if a.snapshots != nil {
 		a.snapshots.StopAll()
 	}

recorder.go

@@ -127,7 +127,8 @@ func (rm *RecorderManager) startRecorder(cam CameraConfig) {
 			"-hide_banner", "-loglevel", "error",
 			"-rtsp_transport", "tcp",
 			"-i", rtspURL,
-			"-c", "copy",       // stream-copy: zero transcoding, near-zero CPU
+			"-an",              // drop audio (pcm_mulaw not supported in MP4)
+			"-c:v", "copy",     // stream-copy video: zero transcoding, near-zero CPU
 			"-t", "300",        // hard stop after 300 seconds (5 minutes)
 			"-y",               // overwrite output without asking
 			partFile,