another shutil update

bin/vcmp

@@ -203,26 +203,28 @@ def process_single_file(
     else:
         # File successfully converted to av1, move to destination
         target_path.parent.mkdir(parents=True, exist_ok=True)
-        try:
-            shutil.move(str(temp_path), str(target_path))
-        except (PermissionError, OSError):
-            try:
-                logging.warning(f"Failed to move file with metadata, falling back to copy")
-                shutil.copy(str(temp_path), str(target_path))
-                temp_path.unlink()
-            except Exception as e:
-                logging.error(f"Failed to copy file: {e}")
-                if temp_path.exists():
-                    temp_path.unlink()
-                release_file_lock(filepath)
-                return False
+        success = False
+
+        try:
+            # Use cp to copy file since it handles permissions better
+            subprocess.run(["cp", str(temp_path), str(target_path)], check=True)
+            temp_path.unlink()
+            success = True
+        except subprocess.CalledProcessError as e:
+            logging.error(f"Failed to copy file: {e}")
+            if temp_path.exists():
+                temp_path.unlink()
+
+        if success:
+            logging.info(f"Successfully compressed {filepath}")
+            if remove_source:
+                logging.info(f"Removing source file {filepath}")
+                filepath.unlink()
+            release_file_lock(filepath)
+            return True
 
-        logging.info(f"Successfully compressed {filepath}")
-        if remove_source:
-            logging.info(f"Removing source file {filepath}")
-            filepath.unlink()
         release_file_lock(filepath)
-        return True
+        return False
 
 def process_directory(
         *,