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diff --git a/media/libaom/src/tools/aggregate_entropy_stats.py b/media/libaom/src/tools/aggregate_entropy_stats.py
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+++ b/media/libaom/src/tools/aggregate_entropy_stats.py
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+#!/usr/bin/env python
+## Copyright (c) 2017, Alliance for Open Media. All rights reserved
+##
+## This source code is subject to the terms of the BSD 2 Clause License and
+## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+## was not distributed with this source code in the LICENSE file, you can
+## obtain it at www.aomedia.org/license/software. If the Alliance for Open
+## Media Patent License 1.0 was not distributed with this source code in the
+## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+##
+"""Aggregate multiple entropy stats output which is written in 32-bit int.
+
+python ./aggregate_entropy_stats.py [dir of stats files] [keyword of filenames]
+ [filename of final stats]
+"""
+
+__author__ = "yuec@google.com"
+
+import os
+import sys
+import numpy as np
+
+def main():
+ dir = sys.argv[1]
+ sum = []
+ for fn in os.listdir(dir):
+ if sys.argv[2] in fn:
+ stats = np.fromfile(dir + fn, dtype=np.int32)
+ if len(sum) == 0:
+ sum = stats
+ else:
+ sum = np.add(sum, stats)
+ if len(sum) == 0:
+ print("No stats file is found. Double-check directory and keyword?")
+ else:
+ sum.tofile(dir+sys.argv[3])
+
+if __name__ == '__main__':
+ main()