diff --git a/src/lerobot/datasets/dataset_tools.py b/src/lerobot/datasets/dataset_tools.py
index 6af190a89..63fa23f5c 100644
--- a/src/lerobot/datasets/dataset_tools.py
+++ b/src/lerobot/datasets/dataset_tools.py
@@ -26,7 +26,7 @@ This module provides utilities for:
 import logging
 import shutil
 from collections.abc import Callable
-from concurrent.futures import ThreadPoolExecutor, as_completed, ProcessPoolExecutor
+from concurrent.futures import ProcessPoolExecutor, ThreadPoolExecutor, as_completed
 from pathlib import Path
 
 import datasets
@@ -1933,9 +1933,7 @@ def reencode_dataset(
         return dataset
     logging.info(f"Re-encoding {len(video_paths_list)} video file(s) with {camera_encoder}")
 
-    worker_args = [
-        (vp, camera_encoder, encoder_threads) for vp in video_paths_list
-    ]
+    worker_args = [(vp, camera_encoder, encoder_threads) for vp in video_paths_list]
     if num_workers and num_workers >= 1:
         with ProcessPoolExecutor(max_workers=num_workers) as pool:
             futures = [pool.submit(_reencode_video_worker, args) for args in worker_args]
@@ -1952,9 +1950,7 @@ def reencode_dataset(
     # Refresh video info in metadata for every video key.
     for vid_key in meta.video_keys:
         video_path = meta.root / meta.get_video_file_path(0, vid_key)
-        meta.info.features[vid_key]["info"] = get_video_info(
-            video_path, camera_encoder=camera_encoder
-        )
+        meta.info.features[vid_key]["info"] = get_video_info(video_path, camera_encoder=camera_encoder)
 
     write_info(meta.info, meta.root)
     logging.info("Dataset metadata updated.")
diff --git a/src/lerobot/datasets/video_utils.py b/src/lerobot/datasets/video_utils.py
index b2404a398..2be13dbac 100644
--- a/src/lerobot/datasets/video_utils.py
+++ b/src/lerobot/datasets/video_utils.py
@@ -456,7 +456,9 @@ def reencode_video(
             with av.open(
                 tmp_output_video_path,
                 mode="w",
-                options={"movflags": "faststart"},  # faststart is to move the metadata to the beginning of the file to speed up loading
+                options={
+                    "movflags": "faststart"
+                },  # faststart is to move the metadata to the beginning of the file to speed up loading
             ) as dst:
                 out_stream = dst.add_stream(vcodec, fps, options=video_options)
                 out_stream.pix_fmt = pix_fmt
diff --git a/src/lerobot/scripts/lerobot_edit_dataset.py b/src/lerobot/scripts/lerobot_edit_dataset.py
index 3cfe8bd4f..8b0dd5ebb 100644
--- a/src/lerobot/scripts/lerobot_edit_dataset.py
+++ b/src/lerobot/scripts/lerobot_edit_dataset.py
@@ -673,8 +673,7 @@ def handle_reencode_videos(cfg: EditDatasetConfig) -> None:
         current_encoder = VideoEncoderConfig.from_video_info(current_info)
         if current_encoder == cfg.operation.camera_encoder:
             logging.info(
-                f"Videos in {cfg.repo_id} are already encoded with {current_encoder}. "
-                "Nothing to do."
+                f"Videos in {cfg.repo_id} are already encoded with {current_encoder}. Nothing to do."
             )
             return
     else:
diff --git a/tests/datasets/test_video_encoding.py b/tests/datasets/test_video_encoding.py
index d1d578f8b..081781fc8 100644
--- a/tests/datasets/test_video_encoding.py
+++ b/tests/datasets/test_video_encoding.py
@@ -17,7 +17,6 @@
 """Unit tests for ``lerobot.datasets.video_utils`` encoding functions and ``lerobot.configs.video.VideoEncoderConfig`` config class."""
 
 import json
-import shutil
 from pathlib import Path
 
 import numpy as np
@@ -499,6 +498,7 @@ class TestReencodeVideo:
         assert info["video.g"] == 6
         assert info["video.crf"] == 23
 
+
 class TestConcatenateVideoFiles:
     def test_two_clips_frame_count(self, tmp_path):
         """Output frame count equals the sum of the two input frame counts."""