diff --git a/converter/avcodecs.py b/converter/avcodecs.py
index 48fd0105..66e015e8 100644
--- a/converter/avcodecs.py
+++ b/converter/avcodecs.py
@@ -29,11 +29,11 @@ def safe_options(self, opts):
         for k, v in opts.items():
             if k in self.encoder_options:
                 typ = self.encoder_options[k]
-                try:
-                    safe[k] = typ(v)
-                except:
-                    pass
-
+                if typ:
+                    try:
+                        safe[k] = typ(v)
+                    except:
+                        pass
         return safe