use default options instead of passing all over the place

render.py

@@ -506,6 +506,7 @@ def parse_lang(lang):
 
 
 def render_all(options):
+    options = load_defaults(options)
     prefix = options['prefix']
     duration = int(options['duration'])
     base = int(options['offset'])
@@ -897,9 +898,22 @@ def scene_subtitles(scene, options):
         offset += clip['duration']
     return subs
 
+
+def load_defaults(options):
+    path = os.path.join(options["prefix"], "options.json")
+    if os.path.exists(path):
+        with open(path) as fd:
+            defaults = json.loads(fd)
+        for key in defaults:
+            if key not in options:
+                options[key] = defaults[key]
+    return options
+
+
 def update_subtitles(options):
     import item.models
 
+    options = load_defaults(options)
     prefix = Path(options['prefix'])
     base = int(options['offset'])
     lang, tlang = parse_lang(options["lang"])