diff --git a/cleanup_episodes.py b/cleanup_episodes.py
new file mode 100644
index 0000000000000000000000000000000000000000..eaece24acde73bbacbcef3c5fb504924ea1857ba
--- /dev/null
+++ b/cleanup_episodes.py
@@ -0,0 +1,93 @@
+import json
+import os
+import glob
+
+def get_valid_episode_indexes():
+    """Read the episodes.jsonl file and extract valid episode indexes."""
+    valid_indexes = set()
+    
+    try:
+        with open('meta/episodes.jsonl', 'r', encoding='utf-8') as f:
+            for line_num, line in enumerate(f, 1):
+                line = line.strip()
+                if not line:  # Skip empty lines
+                    continue
+                try:
+                    episode_data = json.loads(line)
+                    if 'episode_index' in episode_data:
+                        valid_indexes.add(episode_data['episode_index'])
+                    else:
+                        print(f"Warning: No 'episode_index' found on line {line_num}")
+                except json.JSONDecodeError as e:
+                    print(f"Warning: Could not parse JSON on line {line_num}: {e}")
+                    print(f"Line content: '{line[:100]}...' (truncated)")
+                    continue
+    except FileNotFoundError:
+        print("Error: meta/episodes.jsonl file not found!")
+        return set()
+    except Exception as e:
+        print(f"Error reading episodes.jsonl: {e}")
+        return set()
+    
+    return valid_indexes
+
+def cleanup_video_files():
+    """Remove video files that don't correspond to valid episode indexes."""
+    valid_indexes = get_valid_episode_indexes()
+    
+    if not valid_indexes:
+        print("No valid episode indexes found. Exiting.")
+        return
+    
+    print(f"Found {len(valid_indexes)} valid episode indexes: {sorted(list(valid_indexes)[:10])}{'...' if len(valid_indexes) > 10 else ''}")
+    
+    # Find all video directories
+    video_dirs = glob.glob('videos/chunk-*/observation.images.base/')
+    
+    if not video_dirs:
+        print("No video directories found matching pattern 'videos/chunk-*/observation.images.base/'")
+        return
+    
+    print(f"Found {len(video_dirs)} video directories")
+    
+    removed_files = []
+    kept_files = []
+    
+    for video_dir in video_dirs:
+        print(f"\nProcessing directory: {video_dir}")
+        # Find all episode video files in this directory
+        video_files = glob.glob(os.path.join(video_dir, 'episode_*.mp4'))
+        
+        for video_file in video_files:
+            # Extract episode number from filename
+            filename = os.path.basename(video_file)
+            # Extract number from episode_XXXXXX.mp4 format
+            episode_num_str = filename.replace('episode_', '').replace('.mp4', '')
+            
+            try:
+                # Handle leading zeros by converting to int
+                episode_num = int(episode_num_str.lstrip('0') or '0')
+                
+                if episode_num not in valid_indexes:
+                    print(f"  Removing: {filename} (episode {episode_num} not in valid list)")
+                    os.remove(video_file)
+                    removed_files.append(video_file)
+                else:
+                    print(f"  Keeping: {filename} (episode {episode_num} is valid)")
+                    kept_files.append(video_file)
+                    
+            except ValueError:
+                print(f"  Warning: Could not parse episode number from {filename}")
+    
+    print(f"\n" + "="*50)
+    print(f"CLEANUP SUMMARY:")
+    print(f"Files removed: {len(removed_files)}")
+    print(f"Files kept: {len(kept_files)}")
+    
+    if removed_files:
+        print(f"\nRemoved files:")
+        for file in removed_files:
+            print(f"  - {file}")
+
+if __name__ == "__main__":
+    cleanup_video_files() 
\ No newline at end of file
diff --git a/find_small_videos.py b/find_small_videos.py
new file mode 100644
index 0000000000000000000000000000000000000000..68f58ff774ea1937c74c20a5a9eed25d87e29433
--- /dev/null
+++ b/find_small_videos.py
@@ -0,0 +1,73 @@
+import os
+import glob
+
+def find_small_videos(size_threshold_kb=400):
+    """Find all video files smaller than the specified threshold in KB."""
+    size_threshold_bytes = size_threshold_kb * 1024
+    
+    # Find all video files in videos directory and subdirectories
+    video_patterns = [
+        'videos/**/*.mp4',
+        'videos/**/*.avi',
+        'videos/**/*.mov',
+        'videos/**/*.mkv',
+        'videos/**/*.webm'
+    ]
+    
+    small_videos = []
+    
+    for pattern in video_patterns:
+        video_files = glob.glob(pattern, recursive=True)
+        
+        for video_file in video_files:
+            try:
+                file_size = os.path.getsize(video_file)
+                if file_size < size_threshold_bytes:
+                    size_kb = file_size / 1024
+                    small_videos.append({
+                        'path': video_file,
+                        'size_bytes': file_size,
+                        'size_kb': size_kb
+                    })
+            except OSError as e:
+                print(f"Error accessing {video_file}: {e}")
+    
+    return small_videos
+
+def main():
+    print("Searching for video files smaller than 100KB...")
+    small_videos = find_small_videos(100)
+    
+    if not small_videos:
+        print("No video files smaller than 100KB found.")
+        return
+    
+    # Sort by size (smallest first)
+    small_videos.sort(key=lambda x: x['size_bytes'])
+    
+    print(f"\nFound {len(small_videos)} video files smaller than 100KB:")
+    print("=" * 80)
+    
+    total_size_kb = 0
+    for video in small_videos:
+        print(f"{video['path']:<60} {video['size_kb']:>8.2f} KB ({video['size_bytes']:,} bytes)")
+        total_size_kb += video['size_kb']
+    
+    print("=" * 80)
+    print(f"Total size of small videos: {total_size_kb:.2f} KB ({total_size_kb/1024:.2f} MB)")
+    
+    # Also show a summary by directory
+    print("\nSummary by directory:")
+    dir_counts = {}
+    for video in small_videos:
+        directory = os.path.dirname(video['path'])
+        if directory not in dir_counts:
+            dir_counts[directory] = {'count': 0, 'total_size_kb': 0}
+        dir_counts[directory]['count'] += 1
+        dir_counts[directory]['total_size_kb'] += video['size_kb']
+    
+    for directory, stats in sorted(dir_counts.items()):
+        print(f"{directory:<50} {stats['count']:>3} files, {stats['total_size_kb']:>8.2f} KB")
+
+if __name__ == "__main__":
+    main() 
\ No newline at end of file
diff --git a/videos/chunk-000/observation.images.base/episode_000004.mp4 b/videos/chunk-000/observation.images.base/episode_000004.mp4
deleted file mode 100644
index b0c2e0a2a968c58ae8c445ce95aaf88568a0daf3..0000000000000000000000000000000000000000
--- a/videos/chunk-000/observation.images.base/episode_000004.mp4
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deleted file mode 100644
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--- a/videos/chunk-000/observation.images.base/episode_000006.mp4
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