diff --git a/gnes/preprocessor/io_utils/gif.py b/gnes/preprocessor/io_utils/gif.py
index 4e740ec8..24899db6 100644
--- a/gnes/preprocessor/io_utils/gif.py
+++ b/gnes/preprocessor/io_utils/gif.py
@@ -58,8 +58,8 @@ def capture_frames(input_fn: str = 'pipe:',
         if pix_fmt == 'rgba':
             depth = 4
 
-        frames = np.frombuffer(out,
-                               np.uint8).reshape([-1, height, width, depth])
+        frames = np.frombuffer(out, np.uint8).copy()
+        frames = frames.reshape([-1, height, width, depth])
         return frames
 
 
diff --git a/gnes/preprocessor/io_utils/video.py b/gnes/preprocessor/io_utils/video.py
index 7ace4b6a..6f71e866 100644
--- a/gnes/preprocessor/io_utils/video.py
+++ b/gnes/preprocessor/io_utils/video.py
@@ -219,8 +219,8 @@ def capture_frames(input_fn: str = 'pipe:',
         if pix_fmt == 'rgba':
             depth = 4
 
-        frames = np.frombuffer(out,
-                               np.uint8).reshape([-1, height, width, depth])
+        frames = np.frombuffer(out, np.uint8).copy()
+        frames = frames.reshape([-1, height, width, depth])
         return frames
 
 
diff --git a/gnes/proto/__init__.py b/gnes/proto/__init__.py
index 47f91380..6f531846 100644
--- a/gnes/proto/__init__.py
+++ b/gnes/proto/__init__.py
@@ -91,7 +91,8 @@ def blob2array(blob: 'gnes_pb2.NdArray') -> np.ndarray:
     """
     Convert a blob proto to an array.
     """
-    return np.frombuffer(blob.data, dtype=blob.dtype).reshape(blob.shape)
+    x = np.frombuffer(blob.data, dtype=blob.dtype).copy()
+    return x.reshape(blob.shape)
 
 
 def array2blob(x: np.ndarray) -> 'gnes_pb2.NdArray':