Fix display caption loading track: event based now

src/mpv_control.py

@@ -65,11 +65,10 @@ def osd_observer(_name, value):
         print_there(0, 0, '\r'+osd_string[:term_len])
 
 
-@player.property_observer('stream-open-filename')
+@player.event_callback('start-file')
 @logger.catch
-def waiting_load_observer(_name, value):
+def starting_file_handler(value):
     '''just show loading state'''
-    if value and player.core_idle:
     print_there(0, 0, '\rLoading track...')
 
 
@@ -87,8 +86,13 @@ def universal_observer(_name, value):
         else:
             track_size = '?'
         if player.cache_speed:
-            cache_speed = int(player.cache_speed/1024/1024*8)
-            cache_speed = f'| ~{cache_speed}Mbit/s'
+            speed_load = player.cache_speed
+            if speed_load >= 3*1024*1024:
+                cache_speed = '| <<<'
+            elif speed_load >= 1*1024*1024:
+                cache_speed = '| <<*'
+            else:
+                cache_speed = '| <=>'
         else:
             cache_speed = ''
         if player.playlist_count > -1: