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diff --git a/third_party/libwebrtc/rtc_tools/video_file_writer.h b/third_party/libwebrtc/rtc_tools/video_file_writer.h
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+++ b/third_party/libwebrtc/rtc_tools/video_file_writer.h
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+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef RTC_TOOLS_VIDEO_FILE_WRITER_H_
+#define RTC_TOOLS_VIDEO_FILE_WRITER_H_
+
+#include <string>
+
+#include "api/scoped_refptr.h"
+#include "rtc_tools/video_file_reader.h"
+
+namespace webrtc {
+namespace test {
+
+// Writes video to file, determining YUV or Y4M format from the file extension.
+void WriteVideoToFile(const rtc::scoped_refptr<Video>& video,
+                      const std::string& file_name,
+                      int fps);
+
+// Writes Y4M video to file.
+void WriteY4mVideoToFile(const rtc::scoped_refptr<Video>& video,
+                         const std::string& file_name,
+                         int fps);
+
+// Writes YUV video to file.
+void WriteYuvVideoToFile(const rtc::scoped_refptr<Video>& video,
+                         const std::string& file_name,
+                         int fps);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // RTC_TOOLS_VIDEO_FILE_WRITER_H_