diff --git a/test/test_loggers.py b/test/test_loggers.py
index e9a82c6fcff..65bf781dbd5 100644
--- a/test/test_loggers.py
+++ b/test/test_loggers.py
@@ -35,7 +35,9 @@
 else:
     TORCHVISION_VERSION = version.parse("0.0.1")
 
-_has_mp4 = (_has_tv and TORCHVISION_VERSION < version.parse("0.22")) or _has_torchcodec
+_has_mp4 = (
+    _has_tv and version.parse("0.20") <= TORCHVISION_VERSION < version.parse("0.22")
+) or _has_torchcodec
 
 if _has_tb:
     from tensorboard.backend.event_processing.event_accumulator import EventAccumulator
diff --git a/torchrl/data/replay_buffers/storages.py b/torchrl/data/replay_buffers/storages.py
index 471488d6eb3..7d263d3a428 100644
--- a/torchrl/data/replay_buffers/storages.py
+++ b/torchrl/data/replay_buffers/storages.py
@@ -770,7 +770,7 @@ def _storage_keys(self, value):
 
     @property
     def _len(self):
-        _len_value = self.__dict__.get("_len_value", None)
+        _len_value = getattr(self, "_len_value", None)
         if not self._compilable:
             if _len_value is None:
                 _len_value = self._len_value = mp.Value("i", 0)
@@ -783,7 +783,7 @@ def _len(self):
     @_len.setter
     def _len(self, value):
         if not is_compiling() and not self._compilable:
-            _len_value = self.__dict__.get("_len_value", None)
+            _len_value = getattr(self, "_len_value", None)
             if _len_value is None:
                 _len_value = self._len_value = mp.Value("i", 0)
             _len_value.value = value
@@ -793,7 +793,7 @@ def _len(self, value):
     @property
     def _total_shape(self):
         # Total shape, irrespective of how full the storage is
-        _total_shape = self.__dict__.get("_total_shape_value", None)
+        _total_shape = getattr(self, "_total_shape_value", None)
         if _total_shape is None and self.initialized:
             if is_tensor_collection(self._storage):
                 _total_shape = self._storage.shape[: self.ndim]
@@ -2440,7 +2440,7 @@ def __init__(
 
     @property
     def _len(self):
-        _len_value = self.__dict__.get("_len_value", None)
+        _len_value = getattr(self, "_len_value", None)
         if not self._compilable:
             if _len_value is None:
                 _len_value = self._len_value = mp.Value("i", 0)
@@ -2452,7 +2452,7 @@ def _len(self):
     @_len.setter
     def _len(self, value):
         if not is_compiling() and not self._compilable:
-            _len_value = self.__dict__.get("_len_value", None)
+            _len_value = getattr(self, "_len_value", None)
             if _len_value is None:
                 _len_value = self._len_value = mp.Value("i", 0)
             _len_value.value = value
diff --git a/torchrl/data/replay_buffers/writers.py b/torchrl/data/replay_buffers/writers.py
index fc07580396b..183f3cf687b 100644
--- a/torchrl/data/replay_buffers/writers.py
+++ b/torchrl/data/replay_buffers/writers.py
@@ -236,7 +236,7 @@ def _mark_update_entities(self, index: torch.Tensor) -> None:
 
     @property
     def _cursor(self):
-        _cursor_value = self.__dict__.get("_cursor_value", None)
+        _cursor_value = getattr(self, "_cursor_value", None)
         if not self._compilable:
             if _cursor_value is None:
                 _cursor_value = self._cursor_value = mp.Value("i", 0)
@@ -249,7 +249,7 @@ def _cursor(self):
     @_cursor.setter
     def _cursor(self, value):
         if not self._compilable:
-            _cursor_value = self.__dict__.get("_cursor_value", None)
+            _cursor_value = getattr(self, "_cursor_value", None)
             if _cursor_value is None:
                 _cursor_value = self._cursor_value = mp.Value("i", 0)
             _cursor_value.value = value
@@ -258,7 +258,7 @@ def _cursor(self, value):
 
     @property
     def _write_count(self):
-        _write_count = self.__dict__.get("_write_count_value", None)
+        _write_count = getattr(self, "_write_count_value", None)
         if not self._compilable:
             if _write_count is None:
                 _write_count = self._write_count_value = mp.Value("i", 0)
@@ -271,7 +271,7 @@ def _write_count(self):
     @_write_count.setter
     def _write_count(self, value):
         if not self._compilable:
-            _write_count = self.__dict__.get("_write_count_value", None)
+            _write_count = getattr(self, "_write_count_value", None)
             if _write_count is None:
                 _write_count = self._write_count_value = mp.Value("i", 0)
             _write_count.value = value
@@ -531,14 +531,14 @@ def get_insert_index(self, data: Any) -> int:
 
     @property
     def _write_count(self):
-        _write_count = self.__dict__.get("_write_count_value", None)
+        _write_count = getattr(self, "_write_count_value", None)
         if _write_count is None:
             _write_count = self._write_count_value = mp.Value("i", 0)
         return _write_count.value
 
     @_write_count.setter
     def _write_count(self, value):
-        _write_count = self.__dict__.get("_write_count_value", None)
+        _write_count = getattr(self, "_write_count_value", None)
         if _write_count is None:
             _write_count = self._write_count_value = mp.Value("i", 0)
         _write_count.value = value