commit 2ea1de64553d610a2fdd1abe54dba6797a49a5e4
Author: Daniel Mizyrycki <mzdaniel@glidelink.net>
Date:   Sat Sep 24 16:33:28 2022 -0700

    Update code introspection logic in decorators

diff --git a/moviepy/decorators.py b/moviepy/decorators.py
index 277276c..3bce1ac 100644
--- a/moviepy/decorators.py
+++ b/moviepy/decorators.py
@@ -2,6 +2,7 @@
 all decorators used in moviepy go there
 """
 
+import inspect
 import decorator
 
 from moviepy.tools import cvsecs
@@ -76,12 +77,7 @@ def preprocess_args(fun,varnames):
     """ Applies fun to variables in varnames before launching the function """
     
     def wrapper(f, *a, **kw):
-        if hasattr(f, "func_code"):
-            func_code = f.func_code # Python 2
-        else:
-            func_code = f.__code__ # Python 3
-            
-        names = func_code.co_varnames
+        names = inspect.getfullargspec(f).args
         new_a = [fun(arg) if (name in varnames) else arg
                  for (arg, name) in zip(a, names)]
         new_kw = {k: fun(v) if k in varnames else v
@@ -120,12 +116,7 @@ def use_clip_fps_by_default(f, clip, *a, **k):
                 " the clip's fps with `clip.fps=24`" % f.__name__)
 
 
-    if hasattr(f, "func_code"):
-        func_code = f.func_code # Python 2
-    else:
-        func_code = f.__code__ # Python 3
-        
-    names = func_code.co_varnames[1:]
+    names = inspect.getfullargspec(f).args[1:]
     
     new_a = [fun(arg) if (name=='fps') else arg
              for (arg, name) in zip(a, names)]