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diff --git a/third_party/aom/test/time_stamp_test.cc b/third_party/aom/test/time_stamp_test.cc
new file mode 100644
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+++ b/third_party/aom/test/time_stamp_test.cc
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+/*
+ * Copyright (c) 2019, 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.
+ */
+
+//  Test AOM timestamp handling
+
+#include "test/codec_factory.h"
+#include "test/encode_test_driver.h"
+#include "test/util.h"
+#include "test/video_source.h"
+#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
+
+namespace {
+
+const int kVideoSourceWidth = 320;
+const int kVideoSourceHeight = 240;
+const int kFramesToEncode = 3;
+
+// A video source that exposes functions to set the timebase, framerate and
+// starting pts.
+class DummyTimebaseVideoSource : public ::libaom_test::DummyVideoSource {
+ public:
+  // Parameters num and den set the timebase for the video source.
+  DummyTimebaseVideoSource(int num, int den)
+      : framerate_numerator_(30), framerate_denominator_(1), starting_pts_(0) {
+    SetSize(kVideoSourceWidth, kVideoSourceHeight);
+    set_limit(kFramesToEncode);
+    timebase_.num = num;
+    timebase_.den = den;
+  }
+
+  void SetFramerate(int numerator, int denominator) {
+    framerate_numerator_ = numerator;
+    framerate_denominator_ = denominator;
+  }
+
+  // Returns one frames duration in timebase units as a double.
+  double FrameDuration() const {
+    return (static_cast<double>(timebase_.den) / timebase_.num) /
+           (static_cast<double>(framerate_numerator_) / framerate_denominator_);
+  }
+
+  aom_codec_pts_t pts() const override {
+    return static_cast<aom_codec_pts_t>(frame_ * FrameDuration() +
+                                        starting_pts_ + 0.5);
+  }
+
+  unsigned long duration() const override {
+    return static_cast<unsigned long>(FrameDuration() + 0.5);
+  }
+
+  aom_rational_t timebase() const override { return timebase_; }
+
+  void set_starting_pts(int64_t starting_pts) { starting_pts_ = starting_pts; }
+
+ private:
+  aom_rational_t timebase_;
+  int framerate_numerator_;
+  int framerate_denominator_;
+  int64_t starting_pts_;
+};
+
+class TimestampTest
+    : public ::libaom_test::EncoderTest,
+      public ::libaom_test::CodecTestWithParam<libaom_test::TestMode> {
+ protected:
+  TimestampTest() : EncoderTest(GET_PARAM(0)) {}
+  ~TimestampTest() override = default;
+
+  void SetUp() override { InitializeConfig(GET_PARAM(1)); }
+};
+
+// Tests encoding in millisecond timebase.
+TEST_P(TimestampTest, EncodeFrames) {
+  DummyTimebaseVideoSource video(1, 1000);
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+}
+
+TEST_P(TimestampTest, TestMicrosecondTimebase) {
+  // Set the timebase to microseconds.
+  DummyTimebaseVideoSource video(1, 1000000);
+  video.set_limit(1);
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+}
+
+TEST_P(TimestampTest, TestAv1Rollover) {
+  DummyTimebaseVideoSource video(1, 1000);
+  video.set_starting_pts(922337170351ll);
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+}
+#if CONFIG_REALTIME_ONLY
+AV1_INSTANTIATE_TEST_SUITE(TimestampTest,
+                           ::testing::Values(::libaom_test::kRealTime));
+#else
+AV1_INSTANTIATE_TEST_SUITE(TimestampTest,
+                           ::testing::Values(::libaom_test::kRealTime,
+                                             ::libaom_test::kTwoPassGood));
+#endif
+
+}  // namespace