duration not needed for subtitle updates

management/commands/update_subtitles.py

@@ -13,7 +13,6 @@ class Command(BaseCommand):
 
     def add_arguments(self, parser):
         parser.add_argument('--prefix', action='store', dest='prefix', default="/srv/t_for_time", help='prefix to build clips in')
-        parser.add_argument('--duration', action='store', dest='duration', default="3600", help='target duration of all fragments in seconds')
         parser.add_argument('--offset', action='store', dest='offset', default="1024", help='inital offset in pi')
         parser.add_argument('--lang', action='store', dest='lang', default=None, help='subtitle language')
 

render.py

@@ -606,7 +606,6 @@ def update_subtitles(options):
     import item.models
 
     prefix = Path(options['prefix'])
-    duration = int(options['duration'])
     base = int(options['offset'])
     lang = options["lang"]
     if lang and "," in lang: