chore: set default volume to 50

main.py

@@ -11,7 +11,7 @@ import av
 class PlayerState:
     def __init__(self):
         self.paused = True
-        self.volume = 100.0
+        self.volume = 50.0
         self.time_pos = 0.0
         self.seek_request = None
         self.running = True