--- a
+++ b/tools/data/ava/cut_videos.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+##############################################################################
+
+# Cut each video from its 15th to 30th minute.
+
+IN_DATA_DIR="../../../data/ava/videos"
+OUT_DATA_DIR="../../../data/ava/videos_15min"
+
+if [[ ! -d "${OUT_DATA_DIR}" ]]; then
+  echo "${OUT_DATA_DIR} doesn't exist. Creating it.";
+  mkdir -p ${OUT_DATA_DIR}
+fi
+
+for video in $(ls -A1 -U ${IN_DATA_DIR}/*)
+do
+  out_name="${OUT_DATA_DIR}/${video##*/}"
+  if [ ! -f "${out_name}" ]; then
+    ffmpeg -ss 900 -t 901 -i "${video}" -r 30 -strict experimental "${out_name}"
+  fi
+done