diff --git a/server.py b/server.py
index cc68825..5536041 100644
--- a/server.py
+++ b/server.py
@@ -29,6 +29,9 @@ _ffmpeg_in_q = queue.Queue(maxsize=200)
 _mp3_clients = set()  # set[queue.Queue]
 _mp3_lock = threading.Lock()
 _transcode_threads_started = False
+_transcoder_bytes_out = 0
+_transcoder_last_error = None
+_last_audio_chunk_ts = 0.0
 
 
 def _start_transcoder_if_needed():
@@ -62,7 +65,10 @@ def _start_transcoder_if_needed():
         print('⚠️ ffmpeg not found; /stream.mp3 fallback disabled')
         return
 
+    print('🎛️ ffmpeg transcoder started for /stream.mp3')
+
     def _writer():
+        global _transcoder_last_error
         while True:
             chunk = _ffmpeg_in_q.get()
             if chunk is None:
@@ -74,9 +80,11 @@ def _start_transcoder_if_needed():
                 proc.stdin.write(chunk)
             except Exception:
                 # If ffmpeg dies or pipe breaks, just stop writing.
+                _transcoder_last_error = 'stdin write failed'
                 break
 
     def _reader():
+        global _transcoder_bytes_out, _transcoder_last_error
         proc = _ffmpeg_proc
         if proc is None or proc.stdout is None:
             return
@@ -84,9 +92,11 @@ def _start_transcoder_if_needed():
             try:
                 data = proc.stdout.read(4096)
             except Exception:
+                _transcoder_last_error = 'stdout read failed'
                 break
             if not data:
                 break
+            _transcoder_bytes_out += len(data)
             with _mp3_lock:
                 clients = list(_mp3_clients)
             for q in clients:
@@ -120,8 +130,10 @@ def _stop_transcoder():
 
 
 def _feed_transcoder(data: bytes):
+    global _last_audio_chunk_ts
     if _ffmpeg_proc is None or _ffmpeg_proc.poll() is not None:
         return
+    _last_audio_chunk_ts = eventlet.greenthread.time.time()
     try:
         _ffmpeg_in_q.put_nowait(data)
     except Exception:
@@ -280,6 +292,21 @@ def setup_shared_routes(app):
             },
         )
 
+    @app.route('/stream_debug')
+    def stream_debug():
+        proc = _ffmpeg_proc
+        running = proc is not None and proc.poll() is None
+        return jsonify({
+            'broadcast_active': broadcast_state.get('active', False),
+            'broadcast_mimeType': broadcast_state.get('mimeType'),
+            'ffmpeg_running': running,
+            'ffmpeg_found': (proc is not None),
+            'mp3_clients': len(_mp3_clients),
+            'transcoder_bytes_out': _transcoder_bytes_out,
+            'transcoder_last_error': _transcoder_last_error,
+            'last_audio_chunk_ts': _last_audio_chunk_ts,
+        })
+
 # === DJ SERVER (Port 5000) ===
 dj_app = Flask(__name__, static_folder='.', static_url_path='')
 dj_app.config['SECRET_KEY'] = 'dj_panel_secret'
@@ -344,6 +371,10 @@ def dj_audio(data):
     # Relay audio chunk to all listeners immediately
     if broadcast_state['active']:
         listener_socketio.emit('audio_data', data, namespace='/')
+        # Ensure MP3 fallback transcoder is running (if ffmpeg is installed)
+        if _ffmpeg_proc is None or _ffmpeg_proc.poll() is not None:
+            _start_transcoder_if_needed()
+
         if isinstance(data, (bytes, bytearray)):
             _feed_transcoder(bytes(data))